service repair manual

1. SK15SR . . . . . . . . . . . PU06001~
SK20SR . . . . . . . . . . . PM02001~
Issued 04-1999
S5PM0002E-02 NA
SK15SR
SK20SR
HYDRAULIC EXCAVATOR
SHOP MANUAL

2. Bur • Issue Date 04-1999
Printed in U.S.A. • Book/Form Number S5PM0002E-02 NA
Copyright © 2005. Kobelco Construction Machinery America, LLC. All Rights Reserved.
HYDRAULIC EXCAVATOR
SHOP
MANUAL
APPLICABLE
SK15SR. . . . . . . . . . PU06001~
SK20SR. . . . . . . . . . PM02001~
SK15SR / SK20SR

3. Kobelco Construction Machinery America, LLC reserves the right to make improvements in design or changes in specifications at any
time without incurring any obligation to install them on units previously sold.
All data given in this publication is subject to production variations. Dimensions and weights are only approximate. Illustrations do not
necessarily show products in standard condition.For exact information about any particular product, please consult your Dealer.
Any use of editorial or pictorial content is strictly prohibited without express written permission from
Kobelco Construction Machinery America, LLC . Carol Stream, IL 60188 U.S.A..
S5PM0002E-00 NA
S5PM0002E-01 NA
S5PM0002E-02 NA
SK15SR, SK20SR
SK15SR, SK20SR
SK15SR, SK20SR
Not Available
Not Available
04-1999
First Edition
Revision 1
Revision 2
Revision History
Remarks
Issue Issue Date Applicable Machines

4. HYDRAULIC EXCAVATOR
MODEL
SK15SR
SK20SR
BOOKCODE NO. S5PM0002E®

5. HYDRAULIC
EXCAVATOR
SHOP
MANUAL model
SK15SR
SK20SR
This is the shop manua~for KOBELCO
hydraulic excavator. Contained is the necessary technical
data concerning the maintenance and repair of this model. The manual is divided into the following
four major sections ; GENERAL,SYSTEMS, COMPONENTS
and PROCEDURE.
*GENERAL
PM01. SPECIFICATION PM04. MAINTENANCESTANDARDAND
-- OPERATION AND CONTROLS TEST PROCEDURE
(Refer to OperatorsManual) -- PREVENTIVE MAINTENANCE
PM03. LOCATION AND (Refer to OperatorsManual)
WEIGHT OF COMPONENTS PM07. WORKING STANDARD
*SYSTEMS
PM12. HYDRAULIC SYSTEM PM22. CONTROLSYSTEM
PM15. UPPER STRUCTURE PM25. ELECTRIC SYSTEM
PM18. TRAVEL SYSTEM
PM21. A’FFACHMENTS PM29. TROUBLE SHOOTING
*COMPONENTS
12. HYDRAULIC PUMP 16. SWIVELJOINT
13. CONTROLVALVE 17. HYDRAULICCYLINDER
14. OTHER VALVES
15. HYDRAULIC MOTOR 50. ENGINE
"PROCEDURE
Whenchecking
orrepairing
themachine
we suggest
thatyourefer
tothismanual
carefully.
We hope
that
reference
tothis
manual
will
helptomaintain
a hight
level
ofworldng
efficiency
andreliability.
For further
details
on maintenance
and cheksreferto the "OPERATORS
MANUAL"whichhas been
supplied
withthemachine.
Although
all datawas correct
at the timeof printing,
due to continual
designchangesand
improvements,
somecontents
matnotconform
totheactual
machine.
Takespecial
caretoorder
parts
onlyafter
confirming
thevalidity
ofthepartnumber
in the"PARTS
MANUAL".
If younotice
anyexplanatory
discrepancies,
afterconsulting
oneof ourrepresentatives,
please
updata
yourmanual
according
tothelatest
data.
However,
intheevent
of anyspecification
changes,
wewillissue
revised
edition.
INDEX
KOBEID:) Book code No. S5PMOOO2E,

6. SHOP
MANUAL
SKI5SR
model SK2OSR
TABLE OF CONTENTS
1. SPECIFICATION
................................................
2. OPERATION
ANDCONTROLS
(Refer
to Operators
Manual)
PM03
3. LOCATION
ANDWEIGHTOF COMPONENTS
.........
4. MAINTENANCESTANDARDSAND
TEST
PROCEDURES
.......................................... PM04
o
6. PREVENTIVEMAINTENANCE
(Refer to Operators Manual)
PM07
7. WORKING
STANDARDS
.......................................
o
OHowto IndexeachShopManualSection
The GENERALof this shop manualconsistsof 8
headingsas shown above. Each sectioncan be
easilyreferredto by indexesappendedto the
marginof the page as indicatedon the right.
Please
usetheindexes
forspeedy
reference.
r
KOBELO:) GENERAL

7. SK15SR
SK20SR List of Shop Manual GENERALSection
Title
BookCodeNo.
Distribution
Year-
Month
Index
No. SK15SR SK20SR
Applicable
Machines PU06001~07000 PM02001~03500
¯ ~ PU07001- "~ PM03501-
PM01 SPECIFICATION
V S5PM0
I01E’2~
--
. 1999-4 ]
S2PM1003E(!)
-- OPERATION ~ S2PM1004E ",------
Refer
to Operators
manual
LOCATION AND WEIGHT
PM03
OF COMPONENTS 1999-4 J
MAINTENANCE STANDARDS
PM04 S5PM0401EtDi -,---
AND TEST PROCEDURES 1999-4 ]
PREVENTIVE
S2PM0003E(~)
-- ~ S2PM1004E -"---
MAINTENANCE
Refer
to
Operators
manual
S5PM0701E
PM07 WAOPKING STANDARDS
1997-5
* First
edition
: May,
1997
¯ First
revision
: March,
1998
" Second
revision
: April,
1999

8. 1.1
1. SPECIFICATION
GENERAL VIEW
Pl
DE I ERY PORT P1.P2.P3
(PF3/8)
SUCTION
PORT(for Front PI, Center P2)
(PP3/4)
SUCTION
PORT(for Rear pump P3)
(PFI/2)
Fig. 1 General view of hydraulic pump
1.2 SPECtFICATIONS
Type
Item
~~
Displacement cclrev (cu.irgrev)
Working pressure kgf/cm
2 (psi)
KFP1161-61-30
Front P1,Center P2 [
6.1x2(0.37x 2)
210(2,990)
Rear P3
3.0(0.18)
4O(57O)
Rated revolution rpm 2,350
Rotational direction CW(viewing from pump shaft side)
Flow rate ~/min (gal/min) 14.3 × 2(3.8 × 2) 7.1(1.9)
Weight kg(lbs) approx. 5.1(11)

9. 2.1 CONSTRUCTION
2. CONSTRUCTION
AND OPERATION
14
14
16
15
17
i
5
17
15
17
2
3 8
6
14
16
15
10
14
16
15
14
7
14
12
11
17
15
17
15
13
20
Fig. 3 Construction of 3-series gear type hydraulic pump
NO. NAME Q’TY No. NAME Q’TY
1 MOUNTING FLANGE 1 12 DRIVEN GEAR 1
2 GEAR PLATE 1 13 COVER 1
3 FRONT DRIVE GEAR 1 14 PRESSURE PLATE 6
4 DRIVEN GEAR 1 15 PLATE SEAL 6
5 CENTER PLATE 1 16 BACK-UP 6
6 GEAR PLATE 1 17 O-RING 6
7 REAR DR1VE GEAR 1 18 OIL SEAL 1
8 DRIVEVN GEAR 1 19 SNAP RING 1
9 CENTER PLATE 1 20 BOLT 4
10 GEAR PLATE 1 21 WASHER 4
11 3-SERIES REAR DRIVE GEAR 1
2

10. 2.2 OPERATION
The gear pump is so constructed that, with
rotation of the drive shaft, the drive gear and
driven gear are rotated with which the oil
sucked up from tab suction side enters into
the gear tooth groove and is transferred to
the delivery side through the gear plate.
And a pressure balance mechanism is
adopted for this pump to get a high
volumetric efficiency.
As the pressure plates of each pump are able
to move for axial direction while no-load
operation, the pressure plates are pressed to
the gears with the sealing force on the plate
seals.
And while loaded operation, the delivery
pressure is led to the back side of the
pressure plate, that acts as a pressing force
against gears with a slightly greater force
than the force with which the pressure plate
is separated from the gears, to maintain a
proper clearance between the pressure plate
and the side face of gears.
DRIVE GEAR DRIVE SHAFT
GEAR PLATE
q
Suction ~ -~ Delivery
side side
DRIIVEN GEAR
Fig. 3 Operating principal of gear pump
COVER
Bearing with low
pressure lubrication
PRESSURE
PLATE(movableside plate)
GEAR PLATE
alloy]
GEAR:No.oftooth-12 /
PLATE SEAL
MOUNTING
FLANGE
~ (Aluminum alloy]
----~-
ulj~
-l_
PLATE
(Aluminumalloy)
Fig. 4 3-series gear pump
3

11. 3.1
3. REMOVAL AND INSTALLATION
GENERAL PRECAUTIONS
¯ The removing and installing works are to
be carried out at a clean place providing
clean containers to place the removed
parts in.
¯ Before the removal, make around the
ports clean and remove the paint around
each joint with a wire brush.
¯ Clean each of removed parts with a
cleaning oil such as diesel fuel, etc.
¯ Put a match mark on each of the mating
parts so that they shall be installed
keeping relative positioning with each
other.
¯ Replace all the seals to new one at every
removal, and install them with thinly
applying grease.
¯ Check each part for abnormal wear and
seizure, retouch sharp edges and burrs
with a sand paper, etc., if any.
3.2 SPECIAL TOOL
¯ Oilseal
(18)
inserting
jig
(1) Cap
Material
: $46Corequivalent
Apply
hardchrome
plating
(i0p
Makeroundness smooth. ~
~i ot
Sand paper
c..
(2) Sleeve
Material: Aluminum
Unit:mm(in)
1.6a
70(2.76)
Noshap sdge
No shap sdges nor burr:
3.3 REMOVAL
(1) Fix the pump on a vice gripping the
mounting flange (1) making the fixing flange
face to downside.
¯ When gripping it on a vice, use a soft
material such as wooden piece, aluminum
or cupper plate, etc., not to damage the
flange face.
(2) Loosen the bolts (20), and remove them
together with the washers (21).
: 14ram
(3) Remove the cover (13), then remove the
ring (17), plate seal (15) and back-up (16).
17
20
13 21~
Fig. 5

12. (4) Removethe pressure plate(14).
(5) Puta matchmarkonthe shaftendsof the 3-
seriesreardrivegear(11) and the driven
gear
(12),
then
pulloffthegears.
(6) Pull off the pressure plate (4).
¯ While pulling off the pressure plate, pay
special attention not to give it any slant.
When it becomes slant and difficult to
remove, do not forcedly tap it, but makeit
in level by meansof applying hydraulic oil
or alike and pushing it with fingers.
(7) Put a distingushing mark on the gear plate
(10) for its front and rear, then removeit.
14
k
10
Fig. 6
(8) Removethe O-ring (17), plate seal (15)
back-up (16) from the center plate (9).
(9) Pull off the center plate (9) for upwards
lightly tapping its round with a plastic
hammer.
(10) Removethe O-ring (17), plate seal (15)
back-up (16) on the lower surface of center
plate (9)
(11) Removethe pressure plate (14).
(12) Put a match mark on the shaft ends of the
rear drive gear (7) and the driven gear (8),
then pull them off.
¯ Pay special attention not to mix up the
front and the center for the driven gear
(8).
(13) Pull offthe pressure plate(14) on the bottom
ofgear plate(6).
¯ FoUowtethe instruction menfioned in the
above(6).
(14) Put a distingushing mark on the gear plate
(6) for its front and rear, then removeit.
Fig. 7
14
Fig. 8

13. (15) Removethe O-ring (17), plate seal (15)
back-up (16) from the center plate (5).
(16) Pull off the center plate (5) for upwards
lightly tapping its round with a plastic
hammer.
(17) Removethe O-ring (17), plate seal (15)
back-up (16) from the lower face of center
plate (5).
16
(18) Removethe pressure plate (14).
(19) Put a match mark on the shaft ends of the
front drive gear (3) and the driven gear (4),
then pull themof J[i
(20) Pull offthe pressure plate (14) on the bottom
ofgear plate (2).
¯ Follow tothe instruction mentioned in the
above(6).
(21) Put a distingushing mark on the gear plate
(2) for its front and rear, then removeit.
I4
Fig. 9
2
4
14
(22) Removethe O-ring (17), plate seal (15)
back-up (16) from the mounting flange (1).
(23) Remove the snap ring (19), then remove the
oil seal (18).
19
Fig. 10
17
16
15
Fig. 11
6

14. 3,4 INSTALLATION
(I) Makeclean each part.
(2) Grip the mounting flange (1) on a vice at its
non-machined surface making the installing
face to downside.
¯ Apply sof~ material for gripping.
(3) Insert the plate seal (15), back-up (16)
O-ring (17) into the groove on the mounting
flange (1) not allowing them to protrude from
the outer peripheral surface.
¯ Pay attention for the inserting direction of
the back-up (16), (Refer to Fig. 13.)
PLATE SEAL
16
17
1 .~j
BACK-UP
~A
brira upside)
RING
(4) Install the gear plate (2) on the mounting
flange (1).
¯ When it is difficult to insert the
positioning dowel pin, lightly tap it with a
plastic hammer.
(5) Insert the pressure plate (14) into the bottom
of gear plate (2) making the grooved face
upside. (Refer to Fig. 15.)
¯ At this time, pay attention for the
position of the suction side and delivery
side of the pressure plate (14). (Refer
Fig. 15.)
(6) Insert the front drive gear (3) and driven
gear (4) aligning the match mark put at the
removal.
¯ After the insertion, apply 2~3cc (0.122~
0.183cu.in) of clean hydraulic oil to the
gear tooth groove.
(7) Insert the pressure plate (14) into the gear
plate (2) making the grooved face downside.
¯ At that time, pay attention for the
position of the suction side and delivery
side of the pressure plate (14). (Refer
Fig. 15.)
Fig. 13 Installation of back-up
2
Fig. 14
14
Delivery side
Suction side
Fig. 15 Installation of pressure plate
7

15. (8) Securely insert the plate seal (15), back-up
(16) and O-ring (17) into the center plate
of front pump side, not allowing them to
protrude from the outer peripheral surface.
¯ Refer to Fig. 13 for the inserting direction
of back-up (16).
¯ Refer to Fig. 17 for the direction of center
plate (5).
(9) Makingthe seal insertion face of center plate
(5) to downside, install it to the gear plate
(2).
¯ At that time, pay special attention not to
allow dropping off or protrusion of the
plate seal (15), back-up (16) and/or O-ring
(17).
¯ If it is impossible to set the center plate
(5) to the place with 2 or 3 mm(0.08
0.12 in) of gap, probably the seals are not
properly set in place. Confirm it again.
(10) Securely insert the plate seal (15), back-up
(16) and O-ring (17) into the groove on
center plate (5), not allowing them
protrude from the outer peripheral surface.
¯ Refer to Fig. 13 for the inserting direction
of back-up (16).
(II)Install
thegearplate
(6)tothecenter
plate
(5) with the same procedures
as mentioned
intheabove
para.
(4).
(12) Insert the pressure plate (14) into the bottom
of the gear plate (6) with the same
procedures as mentioned in the above para.
(5).
(13)Aligning
the matchmarkput at the removal,
insert
thereardrivegear(7)andthedriven
gear
(8).
¯ Afterthe insertion,
apply2~3cc(0.12~
0.16cu.in)of cleanhydraulic
oil to the
geartooth
groove.
(14) Insert the pressure plate (14) into the gear
plate (6) with the same procedures
mentioned in the above para. (7).
17
17
16
Fig. 16
Theside at whichthis hole goes through the
delivery port, is of the front pump
side.
Delivery port
Fig.17Direction
forcenter
plate
(5)
14
Fig. 18

16. (15) Insert the plate seal (15), back-up (16)
O-ring (17) into the center plate (9) of center
pump side, with the same procedures as
mentioned in the above para. (3).
*Refer to Fig. 17 for the direction of center
plate (9).
-For the center plate, the side with the
suction port is the front pump side, and
the side without the suction port is the
center pump side.
(16) Install the center plate (9) to the gear plate
(6), with the same procedures as mentioned
in the above para. (9).
(17) Insert the plate seal (15), back-up (16)
O-ring (17) into the groove on the center
plate (9), with the same procedures
mentioned in the above para. (9).
(18) Install the gear plato (10) to the center plate
(9), with the same procedures as mentioned
in the above para. (5).
(19) Insert the pressure plato (14) into the bottom
of the gear plate (10), with the same
procedures as mentioned in the above para.
(5).
(20) Insert the 3-series rear drive (11) and driven
gear (12) aligning the match mark put at the
removal.
¯ After the insertion, apply 2~3cc (0.12~
0.18 cu.in) of clean hydraulic oil to the
gear tooth groove.
(21) Insert the pressure plate (14) into the gear
plate (10), with the same procedures
mentioned in the above para. (7).
(22) Insert the plate seal (15), back-up (16)
O-ring (17) into the groove on the cover (13),
with the same procedures as mentioned in
the above para. (3).
(23) Install the cover (13) to the gear plate (10),
with the same procedures as mentioned in
the above para. (9).
17
17
16
is
Fig. 19
14
Fig.20
20
17 13 ~~
16
Fig. 21

17. (24) Set the washers(21) to the pads for bolts (20)
on the cover (13), and insert and tighten
the bolts (20).
: 14m,Tightening torque :
4.75±25kgf.m (34± 1.8ft.lbs)
Note: Makethe threaded portion wet
condition.
(25) Nowtake off the pumpassy from the vice.
Then confirm that the pumpcan be lightly
rotated with a tool turning it from the drive
shaft end.
(26) Install the oil seal (18) to the mounting
flange(1).
¯ Applylithium grease to the lip portion of
oil seal.
¯ Refer to Fig. 22 for the installing
direction.
(27) Install the snap ring (19) to prevent the oil
seal from loosening off. Use the new snap
ring at every removal.
JIG(SLEEVE)
JIG(CAP)
18 1
Inputshall
of pump
Fig. 22 Installation ofoil seal (18)
4.1
(1)
4. MAINTENANCE STANDARDS
CHECKANDMAINTENANCE
After the inspection on the removedparts for
their damages and/or discoloration, clean
them with a cleaning oil. However, do not
soak the parts madeof rubber into the diesel
fuel. Check for the following items, and
retouch or replace to newone if necessary.
Gearplate (2)(6)(10)
To improve the volumetric efficiency, this
gear pumpis so designed that the gear tooth
tip is getting in a direct contact with the
pumpbody while the operation getting to fit
with each other. Therefore , a trace of such
direct contact is observed on adjacent to the
suction port for the pumponce operated.
Thelength of the contacting trace is normal
if it is less than half of the internal periphery
of the gear bore on the pumpbody, with
0.05ram (0.002in) of the depth (a). When
depth (a) becomes more than 0.15mm
(0.006in), it is considered that the shaft
bearing is wornout.
¯ Replace the pumpassy to newone at a~
0.15ram
(0.006in).
Trace of c°ntact ~ Q)~
a
Suction ~very side
Fig. 23 Gear plate
10

18. (2) Drive Gear (3)(7)(11)
Driven Gear (4)(8)(12)
Almost no deterioration for the roughness
would be observed on the shaft and side face
of the gear as far as the hydraulic oil is
clean, and smooth trace of contact should be
observed on them. When the roughness on
the shaft or gear side surface becomes worse
in the extent of scratching with a finger nail
or gear tooth face is abnormally worn out,
replace them to new one.
¯ When the shaft dia. becomes ~ d/
17.930mm(0.706in), replace the pump assy
to new one.
(3) Pressure Plate (14)
The pressure plate surface has a coating of
black color. At the normal condition, as
shown in the Fig. 25, a lustrous trace of
contact is shown on the sliding surface with
the gear. Occasionally, there may appear the
back metal showing silver color partially.
Even if the back metal appears on the
surface, it is normal unless otherwise the
following phenomenon is observed.
¯ The surface becomes rough in the extent
of scratching finger nail.
¯ The thickness becomes less than 3.930mm
(0.155in).
(4) Mounting Flange (1), Center Plates (5)(9).
Cover (13)
As same as the pump body, check for the
eccentric wear on the bearing. The black
gray surface is coated with teflon of soft
material, pay attention for the handling not
to give any scores on it.
¯ Whenthe teflon coating is worn out, and
the red cupper color of back metal
appears in the extent of more than 150
°,
replace it to newone.
(5) Make sure to replace the plate seal (15),
back-up (16), O-ring (17), oil seal (18)
snap ring (19) to new one at every removal.
(6) When either of the mounting flange (1),
center plates (5)(9) or cover (13) is replaced,
make sure to replace the drive gear and
driven gear assembled to it to new one, too.
Otherwise, the required deliverying volume
may not be obtained.
Fig. 24 Drive gear, drive gear
Trace of contact
.... Thickness
Suctionside /
-[I-
Deliveryside
Fig. 25 Pressure plate
Trace of contact on bearing
/
Fig. 26 Flange, plate and cover
11

19. 5. TROUBLESHOOTING
Troubled Condition Possible Causes Measure
Nooil delivered from Lowoil level in tank. Refill hydraulic oil up to specified
gear pump level.
Clogged suction line or strainer. Make them clean. When oil is
contaminated, change oil to new
one.
Gear pump pressure not Pressure plate (14) is worn out. Replace to new one.
mcreased Bearings (pressed fit to (1)(5)(9) Replace to new one.
(13)) are worn out.
Defective plate seal (15) or back-up Replace to new one.
(16).
Improper adjustment of relief Using calibrated pressure gauge,
valve. increase pressure up to specified
level.
Sucking up air. ¯ Retighten looseness in suction
line.
¯ Refill oil in tank.
¯ Check for oil seal in pump.
¯ Do not operate until bubbles in
tank disappear.
Abnormal noise on pump Crashing of suction side hose, or Removecause for crashing of hose,
clogging on strainer, causing make clean strainer.
cavitation
Sucking air due to looseness on Retighten each joint.
suction side joint.
Cavitation due to too high viscosity ¯ Changeoil to proper viscosity.
of oil. ¯ Operate at proper oil temp.
Improper alignment for shafts of Re-align.
pump and engine.
Bubbles in hydraulic oil. Checkfor the causeof generating
bubbles,
andimprove
it.
Oil leakage from pump Defective oil seal (18) or O-ring (17) Replace to new one.
of pump.
Dust caught on seal. Re-check for pump.
12

20. KOBELIO
SHOP MANUAL ApplicableModel:
SK20SR
HYDRAULIC PUMP
TABLE OF CONTENTS
i. SPECIFICATION
i.i
General
View
...................................................... 1
1.2
Specification
......................................................
1
2. CONSTRUCTION AND OPERATION
2.1
Construction
......................................................
2
2.2
Operation
............................................................
4
3. REMOVAL AND INSTALLATION
3.1
Removal
............................................................
6
3.2
Installation
.........................................................
i0
4. MAINTENANCE STANDARDS
4.1Check
andMeasurement
....................................
15
5.TROUBLESHOOTING
.............................................
16
KOBE STEEL, LTD.

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22. m I
The hydraulic pumpsucks up and pressureizes the hydraulic oil and supplies it to
i
each equipment. This manual covers the fundametals on the hydraulic pumponly.
Please refer to the other manualsfor the role and function of the hydraulic pump.
i
Models Applicable Machines Notes Models Applicable Machines Notes
SK20SR PM020Ol-
Revision Date of Issue Remarks
First edition July, 1997 $5120396E S

23. 1.1 GENERALVIEW
1. SPECIFICATION
OIL FILLING PORT
DELIVERY
PORT
P1
~
pFI/4)
DELIVERY
PORT
P2J
(PF3/8)
/
(PF3/s)
DELIVERY
PORT
P4
DELIVERYPORT
P3
(pF1/2)
SUCTION
PORT
$1
(SAEJ518B-11/4)
1.2 SPECIFICATIONS
Fig. 1 General view of hydraulic pump
Table 1
Type
Displacement cdrev (cu’in]rev)
Working pressure kgffc~ (psi)
PVD-0B- 19L3 PS-6G3-4280F
Piston pump
P1, P2
9.3x2 (0.57x2)
210 (2,990)
Gear pump
P3 P4
6.4 (0.39) 2.7 (0.16)
180 (2,560) 40 (570)
Rated revolution rpm 2,350 (Max. : 2,550)
Rotational direction CW(Viewing from pump shaft side)
Flow rate ~/min (gagmin) 21.9x 2 (5.8x 2) 15 (4.0) I 6.3 (1.7)
Control characteristics Total power control (P1 ÷ P2 + P3) (with power-shift by P3 pump)
Weight kg (lbs) 16 (35)

24. 2. CONSTRUCTION
AND OPERATION
2.1 CONSTRUCTION
(1) Hydraulic
Piston
Pump
3
43,42,20,125 23 33 51 39 18 8 9 4 13 15 19 62 61 60 71
34 32 30 36 26 12 10 7 11 6 14 24 35 40 27 56 5 31
67 66 72
2,44,49,52
Fig. 2 Sectional construction of hydraulic pump
65,53,54,68,70
No. NAME Q’TY No, NAME Q’TY No. NAME Q’TY
1 BODY S 1 21 ROD G 1 49 PLUG 5
2 BODY H 1 23 WASHER 2 51 PLUG 1
3 SHAFT 1 24 RETAINER 2 52 SPRING WASHER 5
4 CYLINDER BARREL 1 25 STOPPER PIN A 1 53 PLUG 1
5 VALVE PLATE 1 26 STOPPER PIN B 1 54 ’O-RING 1
6 PISTON I0 27 PIN WITH HOLE i 56 SPRING PIN 1
7 SHOE 10 30 BALL BEARING 1 6O SET SCREW 1
8 SHOE HOLDER 1 31 NEEDLE BEARING 1 61 NUT 1
9 BARREL HOLDER 1 32 OIL SEAL 1 62 SEAL WASHER 1
10 SWASH PLATE 1 33 CONED
DISK SPRING 4 65 GEAR PUMP KIT 1
11 NEEDLE 3 34 SNAP RING 1 66 COUPLING 1
12 OSCILLATING PIN 2 35 SNAP RING 1 67 COLLAR 1
13 PACKING 1 36 SNAP RING 1 68 CAPSCREW 2
14 SPRING C 1 39 O-RING 1 7O WASHER 2
15 SPRING T1 1 4O O-RING 2 71 O-RING 1
18 SPRING HOLDER 1 42 PLUG 1 72 O-RING 1
19 SPRING GUIDE 1 43 O-RING 1
2O PIN 1 44 SOCKET BOLT 5