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MANUAL model
INDEX
HYDRAULIC EXCAVATOR
SPECIFICATIONS
MAINTENANCE
SYSTEM
DISASSEMBLING
TROUBLESHOOTING
E
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OPT.
1
2
3
4
5
6
7
SPECIFICATIONS SECTION
MAINTENANCE SECTION
SYSTEM SECTION
DISASSEMBLY SECTION
TROUBLESHOOTING
ENGINE SECTION
PROCEDURE OF INSTALLING
OPTIONS SECTION
Book Code No.S5LC0011E04
0-1
SK330-8
SK350LC-8
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
0-2
GENERAL SAFETY INFORMATION
Do not operate or perform any maintenance on this
machine until all instructions found in the OPERA-
TOR’S MANUAL and this MANUAL have been thor-
oughly read and understood.
Improper operation or maintenance of this machine
may cause accidents and could result in serious in-
jury or death.
Always keep the manual in storage.
If it is missing or damaged, place an order with an
authorized our Distributor for a replacement.
If you have any questions, please consult an autho-
rized our Distributor.
(1) Most accidents, which occur during operation, are
due to neglect of precautionary measures and safe-
ty rules. Sufficient care should be taken to avoid
these accidents. Erroneous operation, lubrication
or maintenance services are very dangerous and
may cause injury or death of personnel. Therefore
all precautionary measures, NOTES, DANGERS,
WARNINGS and CAUTIONS contained in the man-
ual and on the machine should be read and under-
stood by all personnel before starting any work with
or on the machine.
(2) Operation, inspection, and maintenance should be
carefully carried out, and safety must be given the
first priority. Messages of safety are indicated with
marks. The safety information contained in the
manual is intended only to supplement safety
codes, insurance requirements, local laws, rules
and regulations.
(3) Messages of safety appear in the manual and on
the machine : All messages of safety are identified
by either word of "DANGER", "WARNING" and
"CAUTION".
1) DANGER- Indicates an imminently hazardous
situation which, if not avoided, will result in
death or serious injury and is represented as
follows:
2) WARNING- Indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury and is represented as
follows:
3) CAUTION- Indicates a potentially hazardous
situation which, if not avoided, may result in mi-
nor or moderate injury. It may also be used to
alert against possible damage to the machine
and its components and is represented as fol-
lows:
(4) It is very difficult to forecast every danger that may
occur during operation. However, safety can be en-
sured by fully understanding proper operating pro-
cedures for this machine according to methods
recommended by Manufacturer.
(5) While operating the machine, be sure to perform
work with great care, so as not to damage the ma-
chine, or allow accidents to occur.
(6) Continue studying the manual until all Safety, Oper-
ation and Maintenance procedures are completely
understood by all persons working with the ma-
chine.
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
0-3
SAFETY PRECAUTIONS
The proper and safe lubrication and maintenance
for this machine, recommended by Manufacturer,
are outlined in the OPERATOR’S MANUAL for the
machine.
Improper performance of lubrication or mainte-
nance procedures are dangerous and could result
in injury or death. Read and understand the MAN-
UAL before performing any lubrication or mainte-
nance.
The serviceman or mechanic may be unfamiliar with
many of the systems on this machine. This makes it
important to use caution when performing service work.
A knowledge of the system and or components is im-
portant before the removal or disassembly of any com-
ponent.
Because of the size of some of the machine compo-
nents, the serviceman or mechanic should check the
weights noted in this manual. Use proper lifting proce-
dures when removing any components. Weight of com-
ponents table is shown in the section ;
SPECIFICATIONS.
The following is a list of basic precautions that must al-
ways be observed.
(1) Read and understand all Warning plates and decal
on the machine before Operating, Maintaining or
Repairing this machine.
(2) Always wear protective glasses and protective
shoes when working around machines. In particu-
lar, wear protective glasses when using hammers,
punches or drifts on any part of the machine or at-
tachments. Use welders gloves, hood/goggles,
apron and the protective clothing appropriate to the
welding job being performed. Do not wear loose fit-
ting or torn clothing. Remove all rings from fingers,
loose jewelry, confine long hair and loose clothing
before working on this machinery.
(3) Disconnect the battery and hang a "Do Not Oper-
ate" tag in the Operators Compartment. Remove ig-
nition keys.
(4) If possible, make all repairs with the machine
parked on a firm level surface. Block the machine
so it does not roll while working on or under the ma-
chine. Hang a "Do Not Operate" tag in the Opera-
tors Compartment.
(5) Do not work on any machine that is supported only
by lift, jacks or a hoist. Always use blocks or jack
stands, capable of supporting the machine, before
performing any disassembly.
Do not operate this machine unless you have
read and understand the instructions in the OP-
ERATOR’S MANUAL. Improper machine opera-
tion is dangerous and could result in injury or
death.
(6) Relieve all pressure in air, oil or water systems be-
fore any lines, fittings or related items are discon-
nected or removed. Always make sure all raised
components are blocked correctly and be alert for
possible pressure when disconnecting any device
from a system that utilizes pressure.
(7) Lower the bucket, dozer, or other attachments to
the ground before performing any work on the ma-
chine. If this cannot be done, make sure the bucket,
dozer, ripper or other attachment is blocked correct-
ly to prevent it from dropping unexpectedly.
(8) Use steps and grab handles when mounting or dis-
mounting a machine. Clean any mud or debris from
steps, walkways or work platforms before using.
Always face to the machine when using steps, lad-
ders and walkways. When it is not possible to use
the designed access system, provide ladders, scaf-
folds, or work platforms to perform safe repair oper-
ations.
(9) To avoid back injury, use a hoist when lifting com-
ponents which weigh 20kg (45lbs) or more. Make
sure all chains, hooks, slings, etc., are in good con-
dition and are the correct capacity. Be sure hooks
are positioned correctly. Lifting eyes are not to be
side loaded during a lifting operation.
(10)To avoid burns, be alert for hot parts on machines
which have just been stopped and hot fluids in
lines, tubes and compartments.
(11)Be careful when removing cover plates. Gradually
back off the last two capscrews or nuts located at
opposite ends of the cover or device and carefully
pry cover loose to relieve any spring or other pres-
sure, before removing the last two capscrews or
nuts completely.
(12)Be careful when removing filler caps, breathers and
plugs on the machine. Hold a rag over the cap or
plug to prevent being sprayed or splashed by liq-
uids under pressure. The danger is even greater if
the machine has just been stopped because fluids
can be hot.
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
0-4
(13)Always use the proper tools that are in good condi-
tion and that are suited for the job at hand. Be sure
you understand how to use them before performing
any service work.
(14)Reinstall all fasteners with the same part number.
Do not use a lesser quality fastener if replacements
are necessary.
(15)Repairs which require welding should be per-
formed only with the benefit of the appropriate ref-
erence information and by personnel adequately
trained and knowledgeable in welding procedures.
Determine type of metal being welded and select
correct welding procedure and electrodes, rods or
wire to provide a weld metal strength equivalent at
least to that of the parent metal. Make sure to dis-
connect battery before any welding procedures are
attempted.
(16)Do not damage wiring during removal operations.
Reinstall the wiring so it is not damaged nor will be
damaged in operation of the machine by contacting
sharp corners, or by rubbing against some object or
hot surface. Do not connect wiring to a line contain-
ing fluid.
(17)Be sure all protective devices including guards and
shields are properly installed and functioning cor-
rectly before starting a repair. If a guard or shield
must be removed to perform the repair work, use
extra caution and replace the guard or shield after
repair is completed.
(18)The maintenance and repair work while holding the
bucket raised is dangerous due to the possibility of
a falling attachment. Don’t fail to lower the attach-
ment and place the bucket to the ground before
starting the work.
(19)Loose or damaged fuel, lubricant and hydraulic
lines, tubes and hoses can cause fires. Do not bend
or strike high pressure lines or install ones which
have been bent or damaged. Inspect lines, tubes
and hoses carefully. Do not check for leaks with
your hands. Very small (pinhole) leaks can result in
a high velocity oil stream that will be invisible close
to the hose. This oil can penetrate the skin and
cause personal injury. Use card-board or paper to
locate pinhole leaks.
(20)Tighten connections to the correct torque. Make
sure that all heat shields, clamps and guards are in-
stalled correctly to avoid excessive heat, vibration
or rubbing against other parts during operation.
Shields that protect against oil spray onto hot ex-
haust components in event of a line, tube or seal
failure must be installed correctly.
(21)Do not operate a machine if any rotating part is
damaged or contacts any other part during opera-
tion. Any high speed rotating component that has
been damaged or altered should be checked for
balance before reusing.
(22)Be careful when servicing or separating the tracks
(crawlers). Chips can fly when removing or install-
ing a track (crawlers) pin. Wear safety glasses and
long sleeve protective clothing. Tracks (crawlers)
can unroll very quickly when separated. Keep away
from front and rear of machine. The machine can
move unexpectedly when both tracks (crawlers)
are disengaged from the sprockets. Block the ma-
chine to prevent it from moving.
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
0-5
Index
No.
Title
Book Code No.
Distribution Year–Month
S5LC0211E01
2006-07
S5YN0118E01
2006-07
S5LC0311E02
2007-02
S5LC1111E01
2006-07
S5LC1211E01
2006-07
S5LC1311E02
2007-02
S5LC2111E03
2008-10
S5LC2211E02
2007-02
S5LC2311E02
2007-02
S5LC2411E02
2007-02
S5LC2511E02
2007-02
S5YN3118E01
2006-07
_
_
S5LC3211E01
2006-07
S5LC3311E02
2007-02
_
S5LC4711E02
2007-02
S5YN4818E01
2006-07
S5LC5111E04
2010-07
_
_
LC10-07001~
YC10-03501~
S5LC3411E02
2007-02
S5YN4618E03
2008-10
STANDARD MAINTENANCE
TIME SCHEDULE
MAINTENANCE STANDARDS
AND TEST PROCEDURES
MECHATRO CONTROL
SYSTEM
DISASSEMBLING
& ASSEMBLING
2
1
3
11
12
13
21
22
23
24
25
31
32
33
34
46
47
48
51
OUTLINE
SPECIFICATIONS
ATTACHMENT DIMENSIONS
TOOLS
HYDRAULIC SYSTEM
ELECTRICAL SYSTEM
COMPONENTS SYSTEM
AIR-CONDITIONER SYSTEM
ATTACHMENTS
UPPER STRUCTURE
TRAVEL SYSTEM
BY ERROR CODES
BY TROUBLE
TROUBLE DIAGNOSIS MODE
ENGINE
APPLICABLE MACHINES
SPECIFICATIONS
MAINTENANCE
SYSTEM
DISASSEMBLING
TROUBLESHOOTING
E
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G
INDEX SK330-8/SK350LC-8
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
0-6
NOTE:
This Manual is prepared as a technical material in
which the information necessary for the maintenance
and repairing services of our hydraulic excavators are
collected, and is categorized into 7 Chapters, Specifica-
tion, Maintenance, System, Disassembly, Trouble-
shooting, Engine, and Installation Procedures for
Optional Attachment.
• The Chapter "Specification" describes the specifi-
cations for entire machine and material, which are
instructive for replacement and repairing of attach-
ments.
• The Chapter "Maintenance" describes the material,
which is helpful for maintenance service and adjust-
ments for entire machine.
• The Chapter "System" describes the operating sys-
tem like hydraulic system, electric system, compo-
nents, and so on.
• The Chapter "Disassembly" describes the removal
and installing of assembly mounted on the upper
structure and undercarriage, and the assembling
and disassembling of the associated hydraulic
equipment.
• The Chapter "Troubleshooting" describes how to
find the fault equipment.
• The Chapter "Engine" describes the engines mak-
ing use of the "Maintenance Manual" provided by
the suppliers.
• The Chapter "Installation Procedures for Optional
Attachment" describes the supplements added on
request as required.
This Manual may be properly revised due to the im-
provement of products, modification of specifications,
etc. And there are cases where the system on actual
machine and a part of the contents of this manual may
differ due to the variations of specification by countries.
For the section in which the description is hardly under-
stood, contact our distributor.
The number is assigned to every part handled in this
Manual on account of the description, but the parts,
which cannot be supplied as service parts are con-
tained. Therefore, the order must be placed with re-
spective formal number with due confirmation on the
Parts Manual for applicable machine.
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
1-1
1
Book Code No. S5YN0118E01
1. OUTLINE
TABLE OF CONTENTS
1.1 GENERAL PRECAUTIONS FOR MAKING REPAIRS ......................................................1-3
1.1.1 PREPARATION BEFORE DISASSEMBLING..........................................................1-3
1.1.2 SAFETY WHEN DISASSEMBLING AND ASSEMBLING ........................................1-3
1.1.3 DISASSEMBLING AND ASSEMBLING HYDRAULIC EQUIPMENT .......................1-3
1.1.4 ELECTRICAL EQUIPMENT .....................................................................................1-4
1.1.5 HYDRAULIC PARTS ................................................................................................1-5
1.1.6 WELD REPAIR .........................................................................................................1-5
1.1.7 ENVIRONMENTAL ISSUES.....................................................................................1-5
1.2 INTERNATIONAL UNIT SYSTEM.....................................................................................1-6
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
1. OUTLINE
1-2
Issue Date of Issue Applicable Machines Remarks
First edition July, 2006
SK330-8 : LC10-07001~
SK350LC-8 : YC10-03501~
S5YN0118E01
(ASIA, OCE)
K
↑ August, 2006
SK200-8 : YN11-45001~
SK210LC-8 : YQ11-06001~
↑
(ASIA, OCE)
K
↑ October, 2006
SK250-8: LQ12-06001~
SK260LC–8 : LL12-05001~
↑
(ASIA, OCE)
K
↑ December, 2006 SK850LC: LY01-00101~ ↑ K
↑ February, 2007
E235BSR : YF05-02001~
E235BSR(N)LC : YU05-02001~
↑
(NHK)
K
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
1. OUTLINE
1-3
1.1 GENERAL PRECAUTIONS FOR
MAKING REPAIRS
1.1.1 PREPARATION BEFORE
DISASSEMBLING
(1) Knowledge of operating procedure
Read Operator’s Manual carefully to understand
the operating procedure.
(2) Cleaning machines
Clean machines of soil, mud, and dust before
carrying into the service shop.
Carrying a soiled machine into the service shop,
causes making less efficient work and damage of
parts.
(3) Inspecting machines
Confirm the disassembling section before starting
work, determine the disassembly procedure taking
the conditions in work shop into account, and
request to procure necessary parts in advance.
(4) Recording
Record the following items to keep contact and
prevent malfunction from recurring.
1) Inspecting date, place
2) Model name, Serial number and Record on
hour meter
3) Trouble condition, place, cause
4) Visible oil leak, water leak and damage
5) Clogging of filters, oil level, oil quality, oil
contamination and looseness.
6) Examine the problems on the basis of monthly
operation rate with the last inspection date and
records on hour meter.
(5) Arrangement and cleaning in service shop
1) Tools required for repair work.
2) Prepare the places to put the disassembled
parts.
3) Prepare oil pans for leaking oil, etc.
1.1.2 SAFETY WHEN DISASSEMBLING AND
ASSEMBLING
(1) Safety
1) Wear appropriate clothing, safety shoes, safety
helmet, goggles, and clothes with long sleeves.
2) Attach "Don’t operate" tag to control lever, and
begin a meeting before starting the work.
3) Before starting inspection and maintenance
stop the engine.
4) Confirm the position of first-aid kit and fire
extinguisher, and also where to make contact
for emergency measure and ambulance to
prepare for accidents and fire.
5) Choose a hard, lever and safe place, and put
attachment on the ground without fail.
6) Use hoist, etc. to remove parts of heavy weight
(23kg [50 lb] or more).
7) Use proper tools, and change or repair
defective tools.
8) Machine and attachment required to work in the
lifting condition should be supported with
supports or blocks securely.
1.1.3 DISASSEMBLING AND ASSEMBLING
HYDRAULIC EQUIPMENT
(1) Removing hydraulic equipment assy
1) Before removing pipes, release the pressure of
hydraulic oil tank, or open the cover on the
return side to tank, and take out the filter.
2) Drain the oil in the removed pipes into pan to
prevent the oil from spilling on the ground.
3) Pipes with plugs or caps to prevent oil leaking,
entry of dust, etc.
4) Clean the outside surface of equipment, etc.
before disassembling, and drain hydraulic oil
and gear oil before putting them on working
bench.
(2) Disassembling hydraulic equipment
1) Since performance and function of hydraulic
equipment after disassembly and assembly
results in immunity from responsibility on the
manufacture’s side, disassembly, assembly
and modification without permission are strictly
prohibited.
2) If it is unavoidably necessary to disassemble
and modify, it should be carried out by experts
or personnel qualified through service training.
3) Make match mark on parts for reassembling.
4) Before disassembling, read Disassembling
Instruction in advance, and determine if the
disassembly and assembly are permitted or
not.
Read Operator's Manual
before disassembling
WARNING
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
1. OUTLINE
1-4
5) For parts which are required to use jig and
tools, don’t fail to use the specified jig and tools.
6) For parts which can not be removed in the
specified procedure, never force removal. First
check for the cause.
7) The removed parts should be put in order and
tagged so as to install on proper places without
confusion.
8) For common parts, pay attention to the quantity
and places.
(3) Inspecting parts
1) Check that the disassembled parts are free
from adherence, interference and uneven
working face.
2) Measure the wear of parts and clearance, and
record the measured values.
3) If an abnormality is detected, repair or replace
the parts.
(4) Reassembling hydraulic equipment
1) During the parts cleaning, ventilate the room.
2) Before assembly, clean parts roughly first, and
then completely.
3) Remove adhering oil by compressed air, and
apply hydraulic oil or gear oil, and then
assemble them.
4) Replace the removed O-ring, back-up rings and
oil seal with new ones, and apply grease oil on
them before assembling.
5) Removes dirt and water on the surface on
which liquid sealant are applied, decrease
them, and apply liquid sealant on them.
6) Before assembling, remove rust preventives on
new parts.
7) Use special tools to fit bearings, bushing and oil
seal.
8) Assemble parts matching to the marks.
9) After completion, check that there is no
omission of parts.
(5) Installing hydraulic equipment
1) Confirm hydraulic oil and lubrication oil.
2) Air release is required in the following cases ;
1. Change of hydraulic oil
2. Replacement of parts on suction pipe side
3. Removing and attaching hydraulic pump
4. Removing and attaching swing motor
5. Removing and attaching travel motor
6. Removing and attaching hydraulic cylinder
If hydraulic oil and lubricating oil are not
filled and also air bleed is not performed,
the hydraulic equipment may be damaged.
3) For air bleed of hydraulic pump and swing
motor, loosen drain plug on the upper part, start
engine, and run in low idling, then bleed air until
hydraulic oil is comes out. After completion of
comes, tighten plug securely.
4) For air bleed of travel motor and hydraulic
cylinder, starts engine and operate it for 10
minutes or more at no-load and low speed.
For cylinder, don’t move it to the stroke end
at beginning.
5) Air in pilot circuit can be bleed out by only
operating digging, swing and traveling motions
thoroughly.
6) Check hydraulic oil level.
Move attachments to hydraulic oil check
position, and check hydraulic oil level of tank.
Refill oil if the oil level is lower than the specified
level.
How to check oil level of hydraulic oil tank
1.1.4 ELECTRICAL EQUIPMENT
(1) The disassembly of electrical equipment is not
allowed.
(2) Handle equipment with care so as not to drop it or
bump it.
(3) Connector should be removed by unlocking while
holding the connector.
Never stress in tension to the caulked section by
pulling wire.
(4) Check that connector is connected and locked
completely.
(5) Engine key off before removing and connecting
connector.
LEVEL GAUGE
Oil level of hydraulic oil tank.
If the indicator is within
level marks, the oil quantity
is acceptable.
   
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
1. OUTLINE
1-5
(6) Engine key off before touching terminals of starter
and alternator.
(7) Remove battery grounding terminal before
beginning work close to battery and battery relay
with tools.
(8) Wash machine with care so as not to splash water
on electrical equipment and connector.
(9) When water has entered in the waterproofed
connector, the removing of water is not easy. So
check the removed waterproofed connector with
care to protect it from entry of water. If moisture
adheres on it, dry it completely before connecting.
Battery fluid is dangerous.
The battery fluid is dilute sulfuric acid, and causes
scald and loss of eyesight by adhering on eyes,
skin and clothes. When the fluid has adhered on
them, take an emergency measure immediately and
see a doctor for medical advice.
• When it has adhered on skin ;
Wash with soap and water.
• When it has got in eyes ;
Wash in water for 10 minutes or more
immediately.
• When it has spilled out in large quantity ;
Use sodium bicarbonate to neutralize, or wash
away with water.
• When it was swallowed ;
Drink milk or water.
• When it has adhered on clothes ;
Wash it immediately.
1.1.5 HYDRAULIC PARTS
(1) O-ring
• Check that O-ring is free from flaw and has
elasticity before fitting.
• Even if the size of O-ring is equal, the usage
differs, for example in dynamic and static
sections, the rubber hardness also differs
according to the pressure force, and also the
quality differs depending on the materials to be
seated. So, choose proper O-ring.
• Fit O-ring so as to be free from distortion and
bend.
• Floating seal should be put in pairs.
(2) Flexible hose (F hose)
• Even if the connector and length of hose are the
same, the parts differ according to the
withstanding pressure. Use proper parts.
• Tighten it to the specified torque, and check that
it is free from twist, over tension, interference,
and oil leak.
1.1.6 WELD REPAIR
(1) The weld repair should be carried out by qualified
personnel in the specified procedure after
disconnecting the grounding cable of battery. If the
grounding cable is not disconnected, the electrical
equipment may be damaged.
(2) Remove parts which may cause fire due to the
entry of spark beforehand.
(3) Repair attachments which are damaged, giving
particular attention to the plated section of piston
rod to protect it from sparks, and don’t fail to cover
the section with flame-proof clothes.
1.1.7 ENVIRONMENTAL ISSUES
(1) Engine should be started and operated in the place
where air can be sufficiently ventilated.
(2) Waste disposal
The following parts follows the regulation.
Waste oil, waste container and battery
(3) Precautions for handling hydraulic oil
Hydraulic oil may cause inflammation of eyes.
Wear goggles to protect eyes on handling it.
• When it has got in eyes ;
Wash eyes with water until the stimulus is gone.
• When it was swallowed ;
Don’t force him to vomit it, but immediately
receive medical treatment.
• When it has adhered on skin ;
Wash with soap and water.
(4) Others
For spare parts, grease and oil, use KOBELCO
genuine ones.
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-87
33.2.2.2 PREPARATION FOR DISASSEMBLY
(1) General precautions
1) As all the hydraulic components are precisely machined, it is essential to carry out disassembly and
reassembly in an especially clean location.
2) When handling the control valve, take special care to prevent the entry of foreign matter, such as dust or
sand.
3) Cap each port of the control valve before removing the valve from the machine. Before disassembly, confirm
that each cap is in place and then clean the exterior of the assembly.
Use a workbench. Lay a clean sheet of paper or rubber mat over the workbench.
4) When carrying or moving the control valve, hold the body, and never put pressure on a lever, an exposed
spool, or the end cover. Handle the valve with care.
5) Tests(for relief characteristics, leaks, overload valve setting, flow resistance, etc.) that are desired after
disassembly and reassembly require hydraulic testing apparatus.
For this reason, do not disassemble hydraulic units that you are capable of disassembling but cannot test or
adjust.
Prepare beforehand washing fluid, hydraulic oil, grease, etc. .
(2) Tools
Prepare the following tools before disassembling the control valve.
33.2.2.3 DISASSEMBLY
No. Tools Q’ty Remarks
a Vise 1
b
Box end
wrench
1 of each
size
24mm, 27mm, 32mm
c Allen wrench
1 of each
size
5mm, 6mm, 10mm, 12mm, 14mm, 22mm
d Spanner 1 32 mm
e Loctite #262 1
f Spatula 1
g Pincers 1
h
Adjustable
wrench
1
The figures in parentheses after part names in this
manual represent those item numbers in the structural
sectional drawing under Fig. 33-140 to Fig. 33-145.
(1) Place the control valve on a work bench so as to
locate back pressure check valve upwards.
Disassemble the valve in a clean place, and be careful
not to damage flange surfaces or plate mounting
surfaces.
Fig. 33-146 Preparation for disassembly
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-88
33.2.2.3.1 Disassembling P1 unload spool
(1) Loosen the socket bolts (273) and remove the
spring cover (202) and the O-ring (261) for P1
unload spool.
Fig. 33-147 Removing spring cover (202) for P1
unload spring cover
(2) Draw out, from casing B (102), as a assy of P1
unload spool (309), spring seat (331), springs
(327), (329), stopper (336) and bolt (333).
When drawing out the spool assy, use care so as not to
score casing B (102).
Fig. 33-148 Drawing out P1 unload spool assy (309)
(3) Fix the P1 unload spool assy with vise via a
protective plate (aluminum plate, etc.) and remove
bolt (333). Then separate spring seat (331), springs
(327), (329) and stopper (336) from P1 unload
spool (309).
Fig. 33-149 Disassembling P1 unload spool assy
(309)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-89
33.2.2.3.2 Disassembling the travel spool (left travel and right travel)
(1) Loosen the socket bolts (273) and remove the
spring cover (201) and the O-ring (261) for travel.
Fig. 33-150 Removing spring cover (201)
(2) Draw out the assy of travel spool (306), spring seat
(331), springs (323), (324), stopper (336) and bolt
(333) from casing A (101) or casing B (102).
When drawing out the spool assy, take care so as not
to score the casing A (101) or the casing B (102).
Fig. 33-151 Drawing out travel spool (306) assy
(3) Fix the travel spool assy with vise via a protective
plate (aluminum plate, etc.). Remove bolt (333) and
separate spring seat (331), springs (323), (324) and
stopper (336) from travel spool (306).
Fig. 33-152 Removing right travel
spring cover (201)
Fig. 33-153 Disassembling travel spool (306) assy
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-90
33.2.2.3.3 Disassembling the boom conflux spool
33.2.2.3.4 Disassembling the boom spool
(1) Loosen socket bolts (273) and remove spring cover
(201) for boom conflux and O-ring (261).
(2) Draw out the assy of boom conflux spool (305),
spring seat (331), springs (325), (326), stopper
(339) and bolt (333) from casing A (101).
When drawing out the spool assy, use care so as not to
score casing A (101).
(3) Fix the boom conflux spool with vise via a protective
plate (aluminum plate, etc.) and remove bolt (333).
Then separate spring seat (331), springs (325),
(326) and stopper (339) from boom conflux spool
(305).
Fig. 33-154 Removing spring cover (202)
Fig. 33-155 Drawing out boom conflux spool (305)
assy
(1) Loosen socket bolts (273) and remove spring cover
(203) for boom spool and O-ring (261), (266).
(2) Draw out the assy of boom spool (301), spring seat
(331), springs (321), (322), stopper (336) and bolt
(333) from casing B (102).
When drawing out the spool assy, take care so as not
to score casing B (102).
Fig. 33-156 Removing spring cover (203)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-91
33.2.2.3.5 Disassembling the swing spool
(3) Fix the boom spool assy with vise via a protective
plate (aluminum plate, etc.) and remove bolt (333).
Then separate spring seat (331), springs (321),
(322) and stopper (336) from boom spool (301). Do
not disassemble boom spool (301) further unless
there is special reason.
Fig. 33-157 Drawing out boom spool (301) assy
(1) Loosen the socket bolts (273) and remove the
spring cover sub (204) and the O-ring (261), (266)
for swing. Do not disassemble spring cover sub
(204) further unless there is special reason.
(2) Draw out the assy of swing spool (303), spring seat
(331), springs (321), (322), stopper (336) and bolt
(333) from casing A (101).
When drawing out the spool assy, use care so as not to
score casing A (101).
Fig. 33-158 Removing spring cover sub (204)
(3) Fix the swing spool assy with vise via a protective
plate (aluminum plate, etc.) and remove bolt (333).
Then separate spring seat (331), springs (321),
(322) and stopper (336) from swing spool (303).
Fig. 33-159 Drawing out swing spool (303) assy
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-92
33.2.2.3.6 Disassembling bucket spool
(1) Loosen socket bolts (273) and remove bucket
spring cover (209) and O-ring (261).
Fig. 33-160 Removing spring cover (209)
(2) Draw out the assy of bucket spool (304), spring
seat (331), springs (321), (322), stopper (336) and
bolt (333) from casing B (102).
When drawing out the spool assy, use care so as not to
score casing B (102).
Fig. 33-161 Drawing out bucket spool (304) assy
(3) Fix the bucket spool assy with vise via a protective
plate (aluminum plate, etc.) and remove bolt (333).
Then separate spring seat (331), springs (321),
(322) and stopper (336) from bucket spool (304).
(4) When needed to disassemble the spring cover of
bucket spool, loosen plug (551) with casing B (102)
installed. After removed cover (209) from casing B
(102), remove plug (551) and then take out piston
(216).
Fig. 33-162 Disassembling bucket
spring cover (209)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-93
33.2.2.3.7 Disassembling arm 1 spool
33.2.2.3.8 Disassembling arm 2 spool
(1) Loosen socket bolts (273), and remove spring
cover (201) and O-ring (261) of arm 1 spool.
(2) Draw out the assembly which is consist of arm 1
spool (302), spring seat (331), spring (321, 322),
stopper (336) and bolt (333) from casing A (101).
When drawing out the spool assy, use care so as not to
score casing A (101).
(3) Fix the arm 1 spool assy with vise via a protective
plate (aluminum plate etc.) and remove bolt (333).
Then remove spring seat (331), spring (321, 322)
and stopper (336) from arm 1 spool (302).
Fig. 33-163 Removing arm 1 spring cover (201)
Fig. 33-164 Disassembling arm 1 spool (302) assy
(1) Loosen socket bolts (273), and remove spring
cover (201) and O-ring (261) of arm 2 spool.
(2) Draw out the assembly which is consist of arm 2
spool (308), spring seat (331), spring (321, 328),
stopper (340) and bolt (333) from casing B (102).
When drawing out the spool assy, use care so as not to
score casing B (102).
(3) Fix the arm 2 spool assy with vise via a protective
plate (aluminum plate etc.) and remove bolt (333).
Then remove spring seat (331), spring (321, 328)
and stopper (340) from arm 2 spool (308). Do not
disassemble arm 2 spool (308) further unless there
is special reason.
Fig. 33-165 Removing arm 2 spring cover (201)
Fig. 33-166 Disassembling arm 2 spool (308) assy
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-94
33.2.2.3.9 Disassembling option spool
33.2.2.3.10 Disassembling travel straight spool
(1) Loosen socket bolts (273), and remove spring
cover (201) and O-ring (261) of option spool.
(2) Draw out the assembly which is consist of option
spool (311), spring seat (331), spring (323, 324),
stopper (336) and bolt (333) from casing A (101).
When drawing out the spool assy, use care so as not to
score casing A (101).
(3) Fix the option spool assy with vise via a protective
plate (aluminum plate etc.) and remove bolt (333).
Then remove spring seat (331), spring (323, 324)
and stopper (336) from option spool (311).
Fig. 33-167 Removing option spring cover (201)
Fig. 33-168 Disassembling option spool assy (311)
(1) Loosen the socket bolts (273) and remove the
spring cover (202) and the O-ring (261) for travel
straight.
(2) Draw out the assy of travel straight spool (307),
spring seat (331), springs (327), (329), stopper
(336) and bolt (333) from casing B (102).
When drawing out the spool assy, take care so as not
to score the casing B (102).
(3) Fix the travel straight spool assy with vise via a
protective plate (aluminum plate, etc.). Remove
bolt (333) and separate spring seat (331), springs
(327, 329) and stopper (336) from travel straight
spool (307).
Fig. 33-169 Drawing out travel straight
spool (307) assy
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-95
33.2.2.3.11 Disassembling P2 unload spool
33.2.2.3.12 Removing spool covers
(1) Loosen socket bolts (273), and remove spring
cover (202) of P2 unload spool and O-ring (261).
(2) Draw out the assembly which is consist of P2
unload spool (310), spring seat (331), spring (327,
329), stopper (336) and bolt (333) from casing A
(101).
When drawing out the spool assy, use care so as not to
score casing A (101).
(3) Fix the P2 unload spool assy with vise via a
protective plate (aluminum plate etc.) and remove
bolt (333). Then remove spring seat (331), spring
(327, 329) and stopper (336) from P2 unload spool
(310).
Fig. 33-170 Removing P2 unload spring cover (202)
Fig. 33-171 Disassembling P2 unload
spool assy (310)
(1) Travel, bucket, arm 1, arm 2 and option
Loosen socket bolts (273) and remove spool cover
(205) and O-ring (264).
(2) Swing
Loosen socket bolts (273) and remove spool cover
(206) and O-ring (264), (266). Do not disassemble
spool cover (206) further unless there is special
reason.
(3) Boom
Loosen socket bolts (273) and remove spool cover
(206) and O-ring (264). Do not disassemble spool
cover (208) further unless there is special reason.
Fig. 33-172 Removing spool cover (205),(206)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-96
33.2.2.3.13 Removing relief valve and plug assy for relief valve hole
(1) Remove the main relief valve (601) and overload
relief valve (602), (603) and plug assy (604) from
the casing.
• Distinguish overload relief valve between (602) and
(603) with a tag to prevent them from being
confused during reassembly, as they are the same
in appearance and shape but differ in pressure
setting.
• Regarding the disassembly of the relief valves
themselves, do not disassemble it.
Fig. 33-173 Removing main relief valve (601)
Fig. 33-174 Removing overload relief valve (602)
and (603)
Fig. 33-175 Removing plug assy (604) for relief
valve hole
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
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33. UPPER STRUCTURE
33-97
33.2.2.3.14 Removing by-pass cut valve
33.2.2.3.15 Removing lock valve selector valve sub
33.2.2.3.16 Removing back pressure check valve
(1) Remove by-pass cut valve (606) from the casing.
Remove the by-pass cut valve, giving particular
attention to the poppet (606-201) and spring (606-202)
which may be remained on the inside of casing.
Fig. 33-176 Removing by-pass cut valve (606)
(1) Loosen socket bolt (211-171) and remove lock
valve selector valve sub (211) from the casing.
Further disassembly of the lock valve selector sub
is not allowed.
Fig. 33-177 Removing lock valve selector sub (211)
(1) Loosen socket bolt (278) and remove back
pressure check valve (207) from the casing.
Fig. 33-178 Removing back pressure check valve
cover (207)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-98
33.2.2.3.17 Removing plate
(2) Remove springs (527), (528), boost check valve
poppet sub (517) and by-pass check valve poppet
(518) from the casing. The further disassembly of
boost check valve poppet sub (517) is not allowed.
Replace control valve so that the spool cover face
directs downward.
When replacing, take care so as not to score the spool
cover.
Fig. 33-179 Removing boost check valve sub (517)
and by-pass check valve poppet (518)
(1) Loosen socket bolts (274), (275) and remove plates
(212), (213).
(2) After removing plates, remove all O-rings (162),
(163) remained on the casing side.
Fig. 33-180 Removing plate (212),(213)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
33. UPPER STRUCTURE
33-99
33.2.2.3.18 Removing check valve
33.2.2.3.19 Disassembling casing
Further disassembly of the casing is not allowed.
(1) Remove plugs of load check valve, conflux check
valve, etc. and then remove poppet (511) and
spring (521).
(2) Load check valve on the swing section
Remove plug (556) and then remove poppet (511)
and spring (523).
The plug and spring in use differ from the above (1). Do
not mix the parts when assembling parts again.
(3) Load check valve on arm 2 section
Remove plug (551) and then remove poppet (515)
and spring (521).
The poppet in use differs from the above (1). Do not mix
the parts when assembling parts again.
(4) Lock valve
Remove plug (556) and then remove poppet (514)
and spring (524).
The plug, poppet and spring in use differ from the
above (4). Do not mix the parts when assembling parts
again.
(5) Main relief valve
Remove plug (552) and then remove poppet (512)
and spring (522).
The plug, poppet and spring in use differ from the
above (5). Do not mix the parts when assembling parts
again.
The plugs in which the procedure for disassembly is not
included in the above procedure are usually used to
block auxiliary holes and holes caused by casting. Do
not disassemble further if unnecessary.
Fig. 33-181 Removing plug (551),(556),(552)
Fig. 33-182 Removing poppet (511),(512),(514),(515)
Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]

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Kobelco SK330-8 HYDRAULIC EXCAVATOR Service Repair Manual.pdf

  • 1. SHOP MANUAL model INDEX HYDRAULIC EXCAVATOR SPECIFICATIONS MAINTENANCE SYSTEM DISASSEMBLING TROUBLESHOOTING E / G OPT. 1 2 3 4 5 6 7 SPECIFICATIONS SECTION MAINTENANCE SECTION SYSTEM SECTION DISASSEMBLY SECTION TROUBLESHOOTING ENGINE SECTION PROCEDURE OF INSTALLING OPTIONS SECTION Book Code No.S5LC0011E04 0-1 SK330-8 SK350LC-8 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 2. 0-2 GENERAL SAFETY INFORMATION Do not operate or perform any maintenance on this machine until all instructions found in the OPERA- TOR’S MANUAL and this MANUAL have been thor- oughly read and understood. Improper operation or maintenance of this machine may cause accidents and could result in serious in- jury or death. Always keep the manual in storage. If it is missing or damaged, place an order with an authorized our Distributor for a replacement. If you have any questions, please consult an autho- rized our Distributor. (1) Most accidents, which occur during operation, are due to neglect of precautionary measures and safe- ty rules. Sufficient care should be taken to avoid these accidents. Erroneous operation, lubrication or maintenance services are very dangerous and may cause injury or death of personnel. Therefore all precautionary measures, NOTES, DANGERS, WARNINGS and CAUTIONS contained in the man- ual and on the machine should be read and under- stood by all personnel before starting any work with or on the machine. (2) Operation, inspection, and maintenance should be carefully carried out, and safety must be given the first priority. Messages of safety are indicated with marks. The safety information contained in the manual is intended only to supplement safety codes, insurance requirements, local laws, rules and regulations. (3) Messages of safety appear in the manual and on the machine : All messages of safety are identified by either word of "DANGER", "WARNING" and "CAUTION". 1) DANGER- Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury and is represented as follows: 2) WARNING- Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury and is represented as follows: 3) CAUTION- Indicates a potentially hazardous situation which, if not avoided, may result in mi- nor or moderate injury. It may also be used to alert against possible damage to the machine and its components and is represented as fol- lows: (4) It is very difficult to forecast every danger that may occur during operation. However, safety can be en- sured by fully understanding proper operating pro- cedures for this machine according to methods recommended by Manufacturer. (5) While operating the machine, be sure to perform work with great care, so as not to damage the ma- chine, or allow accidents to occur. (6) Continue studying the manual until all Safety, Oper- ation and Maintenance procedures are completely understood by all persons working with the ma- chine. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 3. 0-3 SAFETY PRECAUTIONS The proper and safe lubrication and maintenance for this machine, recommended by Manufacturer, are outlined in the OPERATOR’S MANUAL for the machine. Improper performance of lubrication or mainte- nance procedures are dangerous and could result in injury or death. Read and understand the MAN- UAL before performing any lubrication or mainte- nance. The serviceman or mechanic may be unfamiliar with many of the systems on this machine. This makes it important to use caution when performing service work. A knowledge of the system and or components is im- portant before the removal or disassembly of any com- ponent. Because of the size of some of the machine compo- nents, the serviceman or mechanic should check the weights noted in this manual. Use proper lifting proce- dures when removing any components. Weight of com- ponents table is shown in the section ; SPECIFICATIONS. The following is a list of basic precautions that must al- ways be observed. (1) Read and understand all Warning plates and decal on the machine before Operating, Maintaining or Repairing this machine. (2) Always wear protective glasses and protective shoes when working around machines. In particu- lar, wear protective glasses when using hammers, punches or drifts on any part of the machine or at- tachments. Use welders gloves, hood/goggles, apron and the protective clothing appropriate to the welding job being performed. Do not wear loose fit- ting or torn clothing. Remove all rings from fingers, loose jewelry, confine long hair and loose clothing before working on this machinery. (3) Disconnect the battery and hang a "Do Not Oper- ate" tag in the Operators Compartment. Remove ig- nition keys. (4) If possible, make all repairs with the machine parked on a firm level surface. Block the machine so it does not roll while working on or under the ma- chine. Hang a "Do Not Operate" tag in the Opera- tors Compartment. (5) Do not work on any machine that is supported only by lift, jacks or a hoist. Always use blocks or jack stands, capable of supporting the machine, before performing any disassembly. Do not operate this machine unless you have read and understand the instructions in the OP- ERATOR’S MANUAL. Improper machine opera- tion is dangerous and could result in injury or death. (6) Relieve all pressure in air, oil or water systems be- fore any lines, fittings or related items are discon- nected or removed. Always make sure all raised components are blocked correctly and be alert for possible pressure when disconnecting any device from a system that utilizes pressure. (7) Lower the bucket, dozer, or other attachments to the ground before performing any work on the ma- chine. If this cannot be done, make sure the bucket, dozer, ripper or other attachment is blocked correct- ly to prevent it from dropping unexpectedly. (8) Use steps and grab handles when mounting or dis- mounting a machine. Clean any mud or debris from steps, walkways or work platforms before using. Always face to the machine when using steps, lad- ders and walkways. When it is not possible to use the designed access system, provide ladders, scaf- folds, or work platforms to perform safe repair oper- ations. (9) To avoid back injury, use a hoist when lifting com- ponents which weigh 20kg (45lbs) or more. Make sure all chains, hooks, slings, etc., are in good con- dition and are the correct capacity. Be sure hooks are positioned correctly. Lifting eyes are not to be side loaded during a lifting operation. (10)To avoid burns, be alert for hot parts on machines which have just been stopped and hot fluids in lines, tubes and compartments. (11)Be careful when removing cover plates. Gradually back off the last two capscrews or nuts located at opposite ends of the cover or device and carefully pry cover loose to relieve any spring or other pres- sure, before removing the last two capscrews or nuts completely. (12)Be careful when removing filler caps, breathers and plugs on the machine. Hold a rag over the cap or plug to prevent being sprayed or splashed by liq- uids under pressure. The danger is even greater if the machine has just been stopped because fluids can be hot. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 4. 0-4 (13)Always use the proper tools that are in good condi- tion and that are suited for the job at hand. Be sure you understand how to use them before performing any service work. (14)Reinstall all fasteners with the same part number. Do not use a lesser quality fastener if replacements are necessary. (15)Repairs which require welding should be per- formed only with the benefit of the appropriate ref- erence information and by personnel adequately trained and knowledgeable in welding procedures. Determine type of metal being welded and select correct welding procedure and electrodes, rods or wire to provide a weld metal strength equivalent at least to that of the parent metal. Make sure to dis- connect battery before any welding procedures are attempted. (16)Do not damage wiring during removal operations. Reinstall the wiring so it is not damaged nor will be damaged in operation of the machine by contacting sharp corners, or by rubbing against some object or hot surface. Do not connect wiring to a line contain- ing fluid. (17)Be sure all protective devices including guards and shields are properly installed and functioning cor- rectly before starting a repair. If a guard or shield must be removed to perform the repair work, use extra caution and replace the guard or shield after repair is completed. (18)The maintenance and repair work while holding the bucket raised is dangerous due to the possibility of a falling attachment. Don’t fail to lower the attach- ment and place the bucket to the ground before starting the work. (19)Loose or damaged fuel, lubricant and hydraulic lines, tubes and hoses can cause fires. Do not bend or strike high pressure lines or install ones which have been bent or damaged. Inspect lines, tubes and hoses carefully. Do not check for leaks with your hands. Very small (pinhole) leaks can result in a high velocity oil stream that will be invisible close to the hose. This oil can penetrate the skin and cause personal injury. Use card-board or paper to locate pinhole leaks. (20)Tighten connections to the correct torque. Make sure that all heat shields, clamps and guards are in- stalled correctly to avoid excessive heat, vibration or rubbing against other parts during operation. Shields that protect against oil spray onto hot ex- haust components in event of a line, tube or seal failure must be installed correctly. (21)Do not operate a machine if any rotating part is damaged or contacts any other part during opera- tion. Any high speed rotating component that has been damaged or altered should be checked for balance before reusing. (22)Be careful when servicing or separating the tracks (crawlers). Chips can fly when removing or install- ing a track (crawlers) pin. Wear safety glasses and long sleeve protective clothing. Tracks (crawlers) can unroll very quickly when separated. Keep away from front and rear of machine. The machine can move unexpectedly when both tracks (crawlers) are disengaged from the sprockets. Block the ma- chine to prevent it from moving. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 5. 0-5 Index No. Title Book Code No. Distribution Year–Month S5LC0211E01 2006-07 S5YN0118E01 2006-07 S5LC0311E02 2007-02 S5LC1111E01 2006-07 S5LC1211E01 2006-07 S5LC1311E02 2007-02 S5LC2111E03 2008-10 S5LC2211E02 2007-02 S5LC2311E02 2007-02 S5LC2411E02 2007-02 S5LC2511E02 2007-02 S5YN3118E01 2006-07 _ _ S5LC3211E01 2006-07 S5LC3311E02 2007-02 _ S5LC4711E02 2007-02 S5YN4818E01 2006-07 S5LC5111E04 2010-07 _ _ LC10-07001~ YC10-03501~ S5LC3411E02 2007-02 S5YN4618E03 2008-10 STANDARD MAINTENANCE TIME SCHEDULE MAINTENANCE STANDARDS AND TEST PROCEDURES MECHATRO CONTROL SYSTEM DISASSEMBLING & ASSEMBLING 2 1 3 11 12 13 21 22 23 24 25 31 32 33 34 46 47 48 51 OUTLINE SPECIFICATIONS ATTACHMENT DIMENSIONS TOOLS HYDRAULIC SYSTEM ELECTRICAL SYSTEM COMPONENTS SYSTEM AIR-CONDITIONER SYSTEM ATTACHMENTS UPPER STRUCTURE TRAVEL SYSTEM BY ERROR CODES BY TROUBLE TROUBLE DIAGNOSIS MODE ENGINE APPLICABLE MACHINES SPECIFICATIONS MAINTENANCE SYSTEM DISASSEMBLING TROUBLESHOOTING E / G INDEX SK330-8/SK350LC-8 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 6. 0-6 NOTE: This Manual is prepared as a technical material in which the information necessary for the maintenance and repairing services of our hydraulic excavators are collected, and is categorized into 7 Chapters, Specifica- tion, Maintenance, System, Disassembly, Trouble- shooting, Engine, and Installation Procedures for Optional Attachment. • The Chapter "Specification" describes the specifi- cations for entire machine and material, which are instructive for replacement and repairing of attach- ments. • The Chapter "Maintenance" describes the material, which is helpful for maintenance service and adjust- ments for entire machine. • The Chapter "System" describes the operating sys- tem like hydraulic system, electric system, compo- nents, and so on. • The Chapter "Disassembly" describes the removal and installing of assembly mounted on the upper structure and undercarriage, and the assembling and disassembling of the associated hydraulic equipment. • The Chapter "Troubleshooting" describes how to find the fault equipment. • The Chapter "Engine" describes the engines mak- ing use of the "Maintenance Manual" provided by the suppliers. • The Chapter "Installation Procedures for Optional Attachment" describes the supplements added on request as required. This Manual may be properly revised due to the im- provement of products, modification of specifications, etc. And there are cases where the system on actual machine and a part of the contents of this manual may differ due to the variations of specification by countries. For the section in which the description is hardly under- stood, contact our distributor. The number is assigned to every part handled in this Manual on account of the description, but the parts, which cannot be supplied as service parts are con- tained. Therefore, the order must be placed with re- spective formal number with due confirmation on the Parts Manual for applicable machine. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 7. 1-1 1 Book Code No. S5YN0118E01 1. OUTLINE TABLE OF CONTENTS 1.1 GENERAL PRECAUTIONS FOR MAKING REPAIRS ......................................................1-3 1.1.1 PREPARATION BEFORE DISASSEMBLING..........................................................1-3 1.1.2 SAFETY WHEN DISASSEMBLING AND ASSEMBLING ........................................1-3 1.1.3 DISASSEMBLING AND ASSEMBLING HYDRAULIC EQUIPMENT .......................1-3 1.1.4 ELECTRICAL EQUIPMENT .....................................................................................1-4 1.1.5 HYDRAULIC PARTS ................................................................................................1-5 1.1.6 WELD REPAIR .........................................................................................................1-5 1.1.7 ENVIRONMENTAL ISSUES.....................................................................................1-5 1.2 INTERNATIONAL UNIT SYSTEM.....................................................................................1-6 Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 8. 1. OUTLINE 1-2 Issue Date of Issue Applicable Machines Remarks First edition July, 2006 SK330-8 : LC10-07001~ SK350LC-8 : YC10-03501~ S5YN0118E01 (ASIA, OCE) K ↑ August, 2006 SK200-8 : YN11-45001~ SK210LC-8 : YQ11-06001~ ↑ (ASIA, OCE) K ↑ October, 2006 SK250-8: LQ12-06001~ SK260LC–8 : LL12-05001~ ↑ (ASIA, OCE) K ↑ December, 2006 SK850LC: LY01-00101~ ↑ K ↑ February, 2007 E235BSR : YF05-02001~ E235BSR(N)LC : YU05-02001~ ↑ (NHK) K Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 9. 1. OUTLINE 1-3 1.1 GENERAL PRECAUTIONS FOR MAKING REPAIRS 1.1.1 PREPARATION BEFORE DISASSEMBLING (1) Knowledge of operating procedure Read Operator’s Manual carefully to understand the operating procedure. (2) Cleaning machines Clean machines of soil, mud, and dust before carrying into the service shop. Carrying a soiled machine into the service shop, causes making less efficient work and damage of parts. (3) Inspecting machines Confirm the disassembling section before starting work, determine the disassembly procedure taking the conditions in work shop into account, and request to procure necessary parts in advance. (4) Recording Record the following items to keep contact and prevent malfunction from recurring. 1) Inspecting date, place 2) Model name, Serial number and Record on hour meter 3) Trouble condition, place, cause 4) Visible oil leak, water leak and damage 5) Clogging of filters, oil level, oil quality, oil contamination and looseness. 6) Examine the problems on the basis of monthly operation rate with the last inspection date and records on hour meter. (5) Arrangement and cleaning in service shop 1) Tools required for repair work. 2) Prepare the places to put the disassembled parts. 3) Prepare oil pans for leaking oil, etc. 1.1.2 SAFETY WHEN DISASSEMBLING AND ASSEMBLING (1) Safety 1) Wear appropriate clothing, safety shoes, safety helmet, goggles, and clothes with long sleeves. 2) Attach "Don’t operate" tag to control lever, and begin a meeting before starting the work. 3) Before starting inspection and maintenance stop the engine. 4) Confirm the position of first-aid kit and fire extinguisher, and also where to make contact for emergency measure and ambulance to prepare for accidents and fire. 5) Choose a hard, lever and safe place, and put attachment on the ground without fail. 6) Use hoist, etc. to remove parts of heavy weight (23kg [50 lb] or more). 7) Use proper tools, and change or repair defective tools. 8) Machine and attachment required to work in the lifting condition should be supported with supports or blocks securely. 1.1.3 DISASSEMBLING AND ASSEMBLING HYDRAULIC EQUIPMENT (1) Removing hydraulic equipment assy 1) Before removing pipes, release the pressure of hydraulic oil tank, or open the cover on the return side to tank, and take out the filter. 2) Drain the oil in the removed pipes into pan to prevent the oil from spilling on the ground. 3) Pipes with plugs or caps to prevent oil leaking, entry of dust, etc. 4) Clean the outside surface of equipment, etc. before disassembling, and drain hydraulic oil and gear oil before putting them on working bench. (2) Disassembling hydraulic equipment 1) Since performance and function of hydraulic equipment after disassembly and assembly results in immunity from responsibility on the manufacture’s side, disassembly, assembly and modification without permission are strictly prohibited. 2) If it is unavoidably necessary to disassemble and modify, it should be carried out by experts or personnel qualified through service training. 3) Make match mark on parts for reassembling. 4) Before disassembling, read Disassembling Instruction in advance, and determine if the disassembly and assembly are permitted or not. Read Operator's Manual before disassembling WARNING Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 10. 1. OUTLINE 1-4 5) For parts which are required to use jig and tools, don’t fail to use the specified jig and tools. 6) For parts which can not be removed in the specified procedure, never force removal. First check for the cause. 7) The removed parts should be put in order and tagged so as to install on proper places without confusion. 8) For common parts, pay attention to the quantity and places. (3) Inspecting parts 1) Check that the disassembled parts are free from adherence, interference and uneven working face. 2) Measure the wear of parts and clearance, and record the measured values. 3) If an abnormality is detected, repair or replace the parts. (4) Reassembling hydraulic equipment 1) During the parts cleaning, ventilate the room. 2) Before assembly, clean parts roughly first, and then completely. 3) Remove adhering oil by compressed air, and apply hydraulic oil or gear oil, and then assemble them. 4) Replace the removed O-ring, back-up rings and oil seal with new ones, and apply grease oil on them before assembling. 5) Removes dirt and water on the surface on which liquid sealant are applied, decrease them, and apply liquid sealant on them. 6) Before assembling, remove rust preventives on new parts. 7) Use special tools to fit bearings, bushing and oil seal. 8) Assemble parts matching to the marks. 9) After completion, check that there is no omission of parts. (5) Installing hydraulic equipment 1) Confirm hydraulic oil and lubrication oil. 2) Air release is required in the following cases ; 1. Change of hydraulic oil 2. Replacement of parts on suction pipe side 3. Removing and attaching hydraulic pump 4. Removing and attaching swing motor 5. Removing and attaching travel motor 6. Removing and attaching hydraulic cylinder If hydraulic oil and lubricating oil are not filled and also air bleed is not performed, the hydraulic equipment may be damaged. 3) For air bleed of hydraulic pump and swing motor, loosen drain plug on the upper part, start engine, and run in low idling, then bleed air until hydraulic oil is comes out. After completion of comes, tighten plug securely. 4) For air bleed of travel motor and hydraulic cylinder, starts engine and operate it for 10 minutes or more at no-load and low speed. For cylinder, don’t move it to the stroke end at beginning. 5) Air in pilot circuit can be bleed out by only operating digging, swing and traveling motions thoroughly. 6) Check hydraulic oil level. Move attachments to hydraulic oil check position, and check hydraulic oil level of tank. Refill oil if the oil level is lower than the specified level. How to check oil level of hydraulic oil tank 1.1.4 ELECTRICAL EQUIPMENT (1) The disassembly of electrical equipment is not allowed. (2) Handle equipment with care so as not to drop it or bump it. (3) Connector should be removed by unlocking while holding the connector. Never stress in tension to the caulked section by pulling wire. (4) Check that connector is connected and locked completely. (5) Engine key off before removing and connecting connector. LEVEL GAUGE Oil level of hydraulic oil tank. If the indicator is within level marks, the oil quantity is acceptable. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 11. 1. OUTLINE 1-5 (6) Engine key off before touching terminals of starter and alternator. (7) Remove battery grounding terminal before beginning work close to battery and battery relay with tools. (8) Wash machine with care so as not to splash water on electrical equipment and connector. (9) When water has entered in the waterproofed connector, the removing of water is not easy. So check the removed waterproofed connector with care to protect it from entry of water. If moisture adheres on it, dry it completely before connecting. Battery fluid is dangerous. The battery fluid is dilute sulfuric acid, and causes scald and loss of eyesight by adhering on eyes, skin and clothes. When the fluid has adhered on them, take an emergency measure immediately and see a doctor for medical advice. • When it has adhered on skin ; Wash with soap and water. • When it has got in eyes ; Wash in water for 10 minutes or more immediately. • When it has spilled out in large quantity ; Use sodium bicarbonate to neutralize, or wash away with water. • When it was swallowed ; Drink milk or water. • When it has adhered on clothes ; Wash it immediately. 1.1.5 HYDRAULIC PARTS (1) O-ring • Check that O-ring is free from flaw and has elasticity before fitting. • Even if the size of O-ring is equal, the usage differs, for example in dynamic and static sections, the rubber hardness also differs according to the pressure force, and also the quality differs depending on the materials to be seated. So, choose proper O-ring. • Fit O-ring so as to be free from distortion and bend. • Floating seal should be put in pairs. (2) Flexible hose (F hose) • Even if the connector and length of hose are the same, the parts differ according to the withstanding pressure. Use proper parts. • Tighten it to the specified torque, and check that it is free from twist, over tension, interference, and oil leak. 1.1.6 WELD REPAIR (1) The weld repair should be carried out by qualified personnel in the specified procedure after disconnecting the grounding cable of battery. If the grounding cable is not disconnected, the electrical equipment may be damaged. (2) Remove parts which may cause fire due to the entry of spark beforehand. (3) Repair attachments which are damaged, giving particular attention to the plated section of piston rod to protect it from sparks, and don’t fail to cover the section with flame-proof clothes. 1.1.7 ENVIRONMENTAL ISSUES (1) Engine should be started and operated in the place where air can be sufficiently ventilated. (2) Waste disposal The following parts follows the regulation. Waste oil, waste container and battery (3) Precautions for handling hydraulic oil Hydraulic oil may cause inflammation of eyes. Wear goggles to protect eyes on handling it. • When it has got in eyes ; Wash eyes with water until the stimulus is gone. • When it was swallowed ; Don’t force him to vomit it, but immediately receive medical treatment. • When it has adhered on skin ; Wash with soap and water. (4) Others For spare parts, grease and oil, use KOBELCO genuine ones. Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 12. 33. UPPER STRUCTURE 33-87 33.2.2.2 PREPARATION FOR DISASSEMBLY (1) General precautions 1) As all the hydraulic components are precisely machined, it is essential to carry out disassembly and reassembly in an especially clean location. 2) When handling the control valve, take special care to prevent the entry of foreign matter, such as dust or sand. 3) Cap each port of the control valve before removing the valve from the machine. Before disassembly, confirm that each cap is in place and then clean the exterior of the assembly. Use a workbench. Lay a clean sheet of paper or rubber mat over the workbench. 4) When carrying or moving the control valve, hold the body, and never put pressure on a lever, an exposed spool, or the end cover. Handle the valve with care. 5) Tests(for relief characteristics, leaks, overload valve setting, flow resistance, etc.) that are desired after disassembly and reassembly require hydraulic testing apparatus. For this reason, do not disassemble hydraulic units that you are capable of disassembling but cannot test or adjust. Prepare beforehand washing fluid, hydraulic oil, grease, etc. . (2) Tools Prepare the following tools before disassembling the control valve. 33.2.2.3 DISASSEMBLY No. Tools Q’ty Remarks a Vise 1 b Box end wrench 1 of each size 24mm, 27mm, 32mm c Allen wrench 1 of each size 5mm, 6mm, 10mm, 12mm, 14mm, 22mm d Spanner 1 32 mm e Loctite #262 1 f Spatula 1 g Pincers 1 h Adjustable wrench 1 The figures in parentheses after part names in this manual represent those item numbers in the structural sectional drawing under Fig. 33-140 to Fig. 33-145. (1) Place the control valve on a work bench so as to locate back pressure check valve upwards. Disassemble the valve in a clean place, and be careful not to damage flange surfaces or plate mounting surfaces. Fig. 33-146 Preparation for disassembly Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 13. 33. UPPER STRUCTURE 33-88 33.2.2.3.1 Disassembling P1 unload spool (1) Loosen the socket bolts (273) and remove the spring cover (202) and the O-ring (261) for P1 unload spool. Fig. 33-147 Removing spring cover (202) for P1 unload spring cover (2) Draw out, from casing B (102), as a assy of P1 unload spool (309), spring seat (331), springs (327), (329), stopper (336) and bolt (333). When drawing out the spool assy, use care so as not to score casing B (102). Fig. 33-148 Drawing out P1 unload spool assy (309) (3) Fix the P1 unload spool assy with vise via a protective plate (aluminum plate, etc.) and remove bolt (333). Then separate spring seat (331), springs (327), (329) and stopper (336) from P1 unload spool (309). Fig. 33-149 Disassembling P1 unload spool assy (309) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 14. 33. UPPER STRUCTURE 33-89 33.2.2.3.2 Disassembling the travel spool (left travel and right travel) (1) Loosen the socket bolts (273) and remove the spring cover (201) and the O-ring (261) for travel. Fig. 33-150 Removing spring cover (201) (2) Draw out the assy of travel spool (306), spring seat (331), springs (323), (324), stopper (336) and bolt (333) from casing A (101) or casing B (102). When drawing out the spool assy, take care so as not to score the casing A (101) or the casing B (102). Fig. 33-151 Drawing out travel spool (306) assy (3) Fix the travel spool assy with vise via a protective plate (aluminum plate, etc.). Remove bolt (333) and separate spring seat (331), springs (323), (324) and stopper (336) from travel spool (306). Fig. 33-152 Removing right travel spring cover (201) Fig. 33-153 Disassembling travel spool (306) assy Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 15. 33. UPPER STRUCTURE 33-90 33.2.2.3.3 Disassembling the boom conflux spool 33.2.2.3.4 Disassembling the boom spool (1) Loosen socket bolts (273) and remove spring cover (201) for boom conflux and O-ring (261). (2) Draw out the assy of boom conflux spool (305), spring seat (331), springs (325), (326), stopper (339) and bolt (333) from casing A (101). When drawing out the spool assy, use care so as not to score casing A (101). (3) Fix the boom conflux spool with vise via a protective plate (aluminum plate, etc.) and remove bolt (333). Then separate spring seat (331), springs (325), (326) and stopper (339) from boom conflux spool (305). Fig. 33-154 Removing spring cover (202) Fig. 33-155 Drawing out boom conflux spool (305) assy (1) Loosen socket bolts (273) and remove spring cover (203) for boom spool and O-ring (261), (266). (2) Draw out the assy of boom spool (301), spring seat (331), springs (321), (322), stopper (336) and bolt (333) from casing B (102). When drawing out the spool assy, take care so as not to score casing B (102). Fig. 33-156 Removing spring cover (203) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 16. 33. UPPER STRUCTURE 33-91 33.2.2.3.5 Disassembling the swing spool (3) Fix the boom spool assy with vise via a protective plate (aluminum plate, etc.) and remove bolt (333). Then separate spring seat (331), springs (321), (322) and stopper (336) from boom spool (301). Do not disassemble boom spool (301) further unless there is special reason. Fig. 33-157 Drawing out boom spool (301) assy (1) Loosen the socket bolts (273) and remove the spring cover sub (204) and the O-ring (261), (266) for swing. Do not disassemble spring cover sub (204) further unless there is special reason. (2) Draw out the assy of swing spool (303), spring seat (331), springs (321), (322), stopper (336) and bolt (333) from casing A (101). When drawing out the spool assy, use care so as not to score casing A (101). Fig. 33-158 Removing spring cover sub (204) (3) Fix the swing spool assy with vise via a protective plate (aluminum plate, etc.) and remove bolt (333). Then separate spring seat (331), springs (321), (322) and stopper (336) from swing spool (303). Fig. 33-159 Drawing out swing spool (303) assy Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 17. 33. UPPER STRUCTURE 33-92 33.2.2.3.6 Disassembling bucket spool (1) Loosen socket bolts (273) and remove bucket spring cover (209) and O-ring (261). Fig. 33-160 Removing spring cover (209) (2) Draw out the assy of bucket spool (304), spring seat (331), springs (321), (322), stopper (336) and bolt (333) from casing B (102). When drawing out the spool assy, use care so as not to score casing B (102). Fig. 33-161 Drawing out bucket spool (304) assy (3) Fix the bucket spool assy with vise via a protective plate (aluminum plate, etc.) and remove bolt (333). Then separate spring seat (331), springs (321), (322) and stopper (336) from bucket spool (304). (4) When needed to disassemble the spring cover of bucket spool, loosen plug (551) with casing B (102) installed. After removed cover (209) from casing B (102), remove plug (551) and then take out piston (216). Fig. 33-162 Disassembling bucket spring cover (209) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 18. 33. UPPER STRUCTURE 33-93 33.2.2.3.7 Disassembling arm 1 spool 33.2.2.3.8 Disassembling arm 2 spool (1) Loosen socket bolts (273), and remove spring cover (201) and O-ring (261) of arm 1 spool. (2) Draw out the assembly which is consist of arm 1 spool (302), spring seat (331), spring (321, 322), stopper (336) and bolt (333) from casing A (101). When drawing out the spool assy, use care so as not to score casing A (101). (3) Fix the arm 1 spool assy with vise via a protective plate (aluminum plate etc.) and remove bolt (333). Then remove spring seat (331), spring (321, 322) and stopper (336) from arm 1 spool (302). Fig. 33-163 Removing arm 1 spring cover (201) Fig. 33-164 Disassembling arm 1 spool (302) assy (1) Loosen socket bolts (273), and remove spring cover (201) and O-ring (261) of arm 2 spool. (2) Draw out the assembly which is consist of arm 2 spool (308), spring seat (331), spring (321, 328), stopper (340) and bolt (333) from casing B (102). When drawing out the spool assy, use care so as not to score casing B (102). (3) Fix the arm 2 spool assy with vise via a protective plate (aluminum plate etc.) and remove bolt (333). Then remove spring seat (331), spring (321, 328) and stopper (340) from arm 2 spool (308). Do not disassemble arm 2 spool (308) further unless there is special reason. Fig. 33-165 Removing arm 2 spring cover (201) Fig. 33-166 Disassembling arm 2 spool (308) assy Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 19. 33. UPPER STRUCTURE 33-94 33.2.2.3.9 Disassembling option spool 33.2.2.3.10 Disassembling travel straight spool (1) Loosen socket bolts (273), and remove spring cover (201) and O-ring (261) of option spool. (2) Draw out the assembly which is consist of option spool (311), spring seat (331), spring (323, 324), stopper (336) and bolt (333) from casing A (101). When drawing out the spool assy, use care so as not to score casing A (101). (3) Fix the option spool assy with vise via a protective plate (aluminum plate etc.) and remove bolt (333). Then remove spring seat (331), spring (323, 324) and stopper (336) from option spool (311). Fig. 33-167 Removing option spring cover (201) Fig. 33-168 Disassembling option spool assy (311) (1) Loosen the socket bolts (273) and remove the spring cover (202) and the O-ring (261) for travel straight. (2) Draw out the assy of travel straight spool (307), spring seat (331), springs (327), (329), stopper (336) and bolt (333) from casing B (102). When drawing out the spool assy, take care so as not to score the casing B (102). (3) Fix the travel straight spool assy with vise via a protective plate (aluminum plate, etc.). Remove bolt (333) and separate spring seat (331), springs (327, 329) and stopper (336) from travel straight spool (307). Fig. 33-169 Drawing out travel straight spool (307) assy Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 20. 33. UPPER STRUCTURE 33-95 33.2.2.3.11 Disassembling P2 unload spool 33.2.2.3.12 Removing spool covers (1) Loosen socket bolts (273), and remove spring cover (202) of P2 unload spool and O-ring (261). (2) Draw out the assembly which is consist of P2 unload spool (310), spring seat (331), spring (327, 329), stopper (336) and bolt (333) from casing A (101). When drawing out the spool assy, use care so as not to score casing A (101). (3) Fix the P2 unload spool assy with vise via a protective plate (aluminum plate etc.) and remove bolt (333). Then remove spring seat (331), spring (327, 329) and stopper (336) from P2 unload spool (310). Fig. 33-170 Removing P2 unload spring cover (202) Fig. 33-171 Disassembling P2 unload spool assy (310) (1) Travel, bucket, arm 1, arm 2 and option Loosen socket bolts (273) and remove spool cover (205) and O-ring (264). (2) Swing Loosen socket bolts (273) and remove spool cover (206) and O-ring (264), (266). Do not disassemble spool cover (206) further unless there is special reason. (3) Boom Loosen socket bolts (273) and remove spool cover (206) and O-ring (264). Do not disassemble spool cover (208) further unless there is special reason. Fig. 33-172 Removing spool cover (205),(206) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 21. 33. UPPER STRUCTURE 33-96 33.2.2.3.13 Removing relief valve and plug assy for relief valve hole (1) Remove the main relief valve (601) and overload relief valve (602), (603) and plug assy (604) from the casing. • Distinguish overload relief valve between (602) and (603) with a tag to prevent them from being confused during reassembly, as they are the same in appearance and shape but differ in pressure setting. • Regarding the disassembly of the relief valves themselves, do not disassemble it. Fig. 33-173 Removing main relief valve (601) Fig. 33-174 Removing overload relief valve (602) and (603) Fig. 33-175 Removing plug assy (604) for relief valve hole Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 22. Thank you very much for your reading. Please Click Here. Then Get COMPLETE MANUAL. NO WAITING NOTE: If there is no response to click on the link above, please download the PDF document first and then click on it.
  • 23. 33. UPPER STRUCTURE 33-97 33.2.2.3.14 Removing by-pass cut valve 33.2.2.3.15 Removing lock valve selector valve sub 33.2.2.3.16 Removing back pressure check valve (1) Remove by-pass cut valve (606) from the casing. Remove the by-pass cut valve, giving particular attention to the poppet (606-201) and spring (606-202) which may be remained on the inside of casing. Fig. 33-176 Removing by-pass cut valve (606) (1) Loosen socket bolt (211-171) and remove lock valve selector valve sub (211) from the casing. Further disassembly of the lock valve selector sub is not allowed. Fig. 33-177 Removing lock valve selector sub (211) (1) Loosen socket bolt (278) and remove back pressure check valve (207) from the casing. Fig. 33-178 Removing back pressure check valve cover (207) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 24. 33. UPPER STRUCTURE 33-98 33.2.2.3.17 Removing plate (2) Remove springs (527), (528), boost check valve poppet sub (517) and by-pass check valve poppet (518) from the casing. The further disassembly of boost check valve poppet sub (517) is not allowed. Replace control valve so that the spool cover face directs downward. When replacing, take care so as not to score the spool cover. Fig. 33-179 Removing boost check valve sub (517) and by-pass check valve poppet (518) (1) Loosen socket bolts (274), (275) and remove plates (212), (213). (2) After removing plates, remove all O-rings (162), (163) remained on the casing side. Fig. 33-180 Removing plate (212),(213) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]
  • 25. 33. UPPER STRUCTURE 33-99 33.2.2.3.18 Removing check valve 33.2.2.3.19 Disassembling casing Further disassembly of the casing is not allowed. (1) Remove plugs of load check valve, conflux check valve, etc. and then remove poppet (511) and spring (521). (2) Load check valve on the swing section Remove plug (556) and then remove poppet (511) and spring (523). The plug and spring in use differ from the above (1). Do not mix the parts when assembling parts again. (3) Load check valve on arm 2 section Remove plug (551) and then remove poppet (515) and spring (521). The poppet in use differs from the above (1). Do not mix the parts when assembling parts again. (4) Lock valve Remove plug (556) and then remove poppet (514) and spring (524). The plug, poppet and spring in use differ from the above (4). Do not mix the parts when assembling parts again. (5) Main relief valve Remove plug (552) and then remove poppet (512) and spring (522). The plug, poppet and spring in use differ from the above (5). Do not mix the parts when assembling parts again. The plugs in which the procedure for disassembly is not included in the above procedure are usually used to block auxiliary holes and holes caused by casting. Do not disassemble further if unnecessary. Fig. 33-181 Removing plug (551),(556),(552) Fig. 33-182 Removing poppet (511),(512),(514),(515) Copyright © 2015 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S5LC0011E04] [0713CsCshWbYs]