service repair manual

1. K1046036E Shop Manual
Copyright 2008 Doosan
DOOSAN reserves the right to improve our products in a continuing process to provide the best possible
product to the market place. These improvements can be implemented at any time with no obligation to
change materials on previously sold products. It is recommended that consumers periodically contact their
distributors for recent documentation on purchased equipment.
This documentation may include attachments and optional equipment that is not available in your
machine's package. Please call your distributor for additional items that you may require.
Illustrations used throughout this manual are used only as a representation of the actual piece of
equipment, and may vary from the actual item.
Shop Manual
K1046036E
Serial Number 5980 and Up
DX350LC

2. Table of Contents
Page I
1Table of Contents
Safety
Track Excavator Safety......................................................................... SP000907
Specifications
Specification for DX350LC.................................................................... SP001772
General Maintenance
General Maintenance Procedures........................................................ SP000016
Standard Torques................................................................................. SP000813
Upper Structure
Cabin .................................................................................................... SP001737
Counterweight....................................................................................... SP001738
Fuel Tank.............................................................................................. SP001739
Fuel Transfer Pump (Opt)..................................................................... SP000021
Swing Bearing....................................................................................... SP001856
Swing Reduction Gear.......................................................................... SP001740
Lower Structure and Chassis
Track Assembly .................................................................................... SP001741
Engine and Drive Train
Drive Coupling (Main Pump)................................................................. SP000026
Hydraulics
Hydraulic System Troubleshooting, Testing and Adjustment ............... SP001773
Accumulator.......................................................................................... SP000028
Center Joint (Swivel)............................................................................. SP000181
Cylinders............................................................................................... SP000030

3. Table of Contents
Page II
Swing Motor.......................................................................................... SP000261
Travel Motor.......................................................................................... SP000253
Main Pump............................................................................................ SP000186
Gear Pump ........................................................................................... SP000260
Main Control Valve ............................................................................... SP001792
Remote Control Valve (Work Lever / Joystick)..................................... SP000069
Travel Control Valve (With Damper)..................................................... SP001743
Solenoid Valve Assembly ..................................................................... SP001793
Breaker EPPR Valve (Opt) ................................................................... SP000192
Hydraulic Schematic (DX350LC).......................................................... SP001774
Electrical System
Electrical System .................................................................................. SP001776
Electrical Schematic DX300/340/350LC............................................... SP001768
Attachments
Boom and Arm...................................................................................... SP001851
Bucket................................................................................................... SP001852

4. SP000907
Page 1
Track Excavator Safety
SP000907
TRACK EXCAVATOR SAFETYSP000907
Track
Excavator
Safety
Edition 1

5. SP000907
Page 5
Track Excavator Safety
SAFETY PRECAUTIONS
APPLICABLE MODELS
The contents of this section apply to the following models and
serial number ranges.
CAUTION!
Follow all safety recommendations and safe shop practices
outlined in the front of this manual or those contained
within this section.
Always use tools and equipment that are in good working
order.
Use lifting and hoisting equipment capable of safely
handling load.
Remember, that ultimately safety is your own personal
responsibility.
MODEL SERIAL NUMBER RANGE
DX300LC 7440 and Up
DX340LC 5980 and Up
DX350LC 5980 and Up
DX420LC 5327 and Up
DX480LC 5221 and Up
DX520LC 5117 and Up

6. SP000907Track Excavator Safety
Page 6
TO THE OPERATOR OF A
DOOSAN EXCAVATOR
Please respect the importance of taking responsibility for your
own safety, and that of other people who may be affected by
your actions.
The safety information on the following pages is organized into
the following sections:
1. “General Safety Essentials” on page 1-9
2. “Location of Safety Labels” on page 1-10
3. “Summary of Safety Precautions for Lifting in Digging
Mode” on page 1-10
4. “Unauthorized Modifications” on page 1-11
5. “General Hazard Information” on page 1-11
6. “Before Starting Engine” on page 1-20
7. “Machine Operation” on page 1-24
8. “Maintenance” on page 1-31
9. “Battery” on page 1-39
10. “Towing” on page 1-41
11. “Shipping and Transportation” on page 1-42
12. “Lifting With Sling” on page 1-42
DANGER!
Unsafe use of the excavator could lead to serious injury or
death. Operating procedures, maintenance and equipment
practices or traveling or shipping methods that do not
follow the safety guidelines on the following pages could
cause serious, potentially fatal injuries or extensive
damage to the machine or nearby property.

7. SP000907
Page 7
Track Excavator Safety
WARNING!
Improper operation and maintenance of this machine can
be hazardous and could result in serious injury or death.
Operator and maintenance personnel should read this
manual thoroughly before beginning operation or
maintenance.
Keep this manual in the storage compartment to the rear of
the operator's seat, and have all personnel involved in
working on the machine read the manual periodically.
Some actions involved in operation and maintenance of the
machine can cause a serious accident, if they are not done
in a manner described in this manual.
The procedures and precautions given in this manual apply
only to intended uses of the machine.
If you use your machine for any unintended uses that are
not specifically prohibited, you must be sure that it is safe
for any others. In no event should you or others engage in
prohibited uses or actions as described in this manual.
DOOSAN delivers machines that comply with all applicable
regulations and standards of the country to which it has
been shipped. If this machine has been purchased in
another country or purchased from someone in another
country, it may lack certain safety devices and
specifications that are necessary for use in your country. If
there is any question about whether your product complies
with the applicable standards and regulations of your
country, consult DOOSAN or your DOOSAN distributor
before operating the machine.
SAFETY ALERT SYMBOL
Be Prepared - Get to Know All Operating and Safety
Instructions.
This is the Safety Alert Symbol. Wherever it appears in this
manual or on safety signs on the machine you should be
alert to the potential for personal injury or accidents.
Always observe safety precautions and follow
recommended procedures.

8. SP000907Track Excavator Safety
Page 8
Learn the Signal Words Used with the
Safety Alert Symbol
The words "CAUTION," "WARNING," and "DANGER" used
throughout this manual and on decals on the machine indicate
degree of risk of hazards or unsafe practices. All three degrees
of risk indicate that safety is involved. Observe precautions
indicated whenever you see the Safety Alert "Triangle," no
matter which signal word appears next to the "Exclamation
Point" symbol.
Safety precautions are described in SAFETY from page -10 on.
DOOSAN cannot predict every circumstance that might involve
a potential hazard in operation and maintenance. Therefore the
safety messages in this manual and on the machine may not
include all possible safety precautions. If any procedures or
actions not specifically recommended or allowed in this manual
are used, you must be sure that you and others can do such
procedures and actions safely and without damaging the
machine. If you are unsure about the safety of some procedures,
contact a DOOSAN distributor.
CAUTION!
This word is used on safety messages and safety labels and
indicates potential of a hazardous situation that, if not
avoided, could result in minor or moderate injury. It may
also be used to alert against a generally unsafe practice.
WARNING!
This word is used on safety messages and safety labels and
indicates potential of a hazardous situation that, if not
avoided, could result in serious injury or death. It may also
be used to alert against a highly unsafe practice.
DANGER!
This word is used on safety messages and safety labels and
indicates an imminent hazard of a situation that, if not
avoided, is very likely to cause death or extremely serious
injury. It may also be used to alert against equipment that
may explode or detonate if handled or treated carelessly.

9. SP000907
Page 9
Track Excavator Safety
GENERAL SAFETY ESSENTIALS
Accessory Applications
The excavator has been primarily designed for moving earth
with a bucket. For use as a grapple or for other object handling,
contact DOOSAN for proper installation and application. Lifting-
work applications (unless restricted or prohibited by local
regulations) are permitted in approved lift configuration, to rated
capacity only, with no side-loading. DO NOT use the machine
for activities for which it was not intended. DO NOT use the
bucket for lifting work, unless lift slings are used in the approved
configuration.
Use of an accessory hydraulic hammer (breaker), work in rough
terrain, demolition applications or other hazardous operation
may require installation of additional protective structures to
safeguard the operator.
Lifting Capacity Rating Configuration
Lifting capacity ratings that are printed at the end of this safety
section are based on the machine being level, on a firm
supporting surface, with hooks and slings attached in approved
configuration. Loads must be balanced and supported evenly.
Use tag lines to keep the load steady if wind conditions and
large surface area are a problem. Work crew hand signals,
individual tasks and safe procedures should all be universally
understood before the lift is made.
IMPORTANT
Before using the excavator to make lifts check municipal
and regional regulations or statutes that could apply.
Governing ordinances may require that all heavy lifting be
done with single purpose equipment specifically designed
for making lifts, or other local restrictions may apply.
Making heavy lifts with a general purpose excavator that
can be used for digging, loading, grading or other work may
be expressly forbidden by a regional injunction or other
legal prohibition. Always follow all of the other instructions,
guidelines and restrictions for Safe Lifting in the Operation
and Maintenance Manuals.

10. SP001737
Page 5
Cabin
SAFETY PRECAUTIONS
APPLICABLE MODELS
The contents of this section apply to the following models and
serial number ranges.
CAUTION
Follow all safety recommendations and safe shop practices
outlined in the front of this manual or those contained
within this section.
Always use tools and equipment that are in good working
order.
Use lifting and hoisting equipment capable of safely
handling load.
Remember, that ultimately safety is your own personal
responsibility.
MODEL SERIAL NUMBER RANGE
DX300LC 7440 and Up
DX340LC 5980 and Up
DX350LC 5980 and Up
DX420LC 5327 and Up
DX480LC 5221 and Up
DX520LC 5117 and Up

11. SP001737Cabin
Page 6
REMOVAL
1. Park on firm and level ground.
2. Lower front attachment (bucket) to ground.
3. Shut down engine.
4. Set safety lever on "RELEASED" position.
5. Turn starter switch to "I" (ON) position.
6. Fully stroke work levers (joysticks) in all directions to
relieve pressure from accumulators.
7. Set safety lever on "LOCK" position.
8. Turn key to "O" (OFF) position and remove from starter
switch.
9. Hang maintenance warning tag on controls.
10. Disconnect the battery cable from the negative (-) battery
terminal.
11. Prepare cabin shell for removal by disconnecting wiring
connectors for:
A. Cabin interior lighting.
B. External light wiring.
C. Radio antenna and connections.
D. Wiper/washer connections.
NOTE: Control console wiring harnesses and hydraulic
piping lines that pass through the floor of the
cabin do not need to be disassembled.
NOTE: If unit is equipped with a cabin protective
structure (for forestry, or hazardous working
conditions), it must be removed.
CAUTION
Avoid disassembling cabin if there are strong wind gusts,
which could catch large surface area of cabin shell and
push it sideways during lift.
O I
FG014348
DO NOT OPERATE
when performing inspection
WARNING
190-00695A
or maintenance
Figure 1
WARNING
If engine must be run while performing maintenance,
use extreme care. Always have one person in the
cabin at all times. Never leave the cabin with the
engine running.

12. SP001737
Page 7
Cabin
12. Remove floor mat (1, Figure 2).
13. Remove seat (2, Figure 2).
NOTE: Be careful not to damage seat covering.
14. Remove cup holder (3, Figure 2).
Remove front cover (4, Figure 2) and side covers (5 and 6,
Figure 2). When removing cover(4, Figure 2), disconnect
hour meter connector.
NOTE: Don't remove monitor panel (7, Figure 2) and
switch panel (8, Figure 2).
15. After removing rear mat (1, Figure 3), remove rear center
cover (2, Figure 3), cassette cover(3, Figure 3) and rear
side covers (4 and 5, Figure 3).
16. Remove fuse box bracket (1, Figure 4) from left side wall
without disassembly harness connector.
17. Disconnect cabin ground cable located near fuse box
bracket.
18. Remove cassette bracket (2, Figure 4) and disconnet
antenna and speaker wire.
19. Remove electric box (4, Figure 4) without disassembly
harness connectors.
Figure 2
Figure 3
Figure 4

13. SP001737Cabin
Page 8
20. Remove air ducts (1, 2, 3 and 4, Figure 5) from cabin rear
panel.
21. Remove across bar (5, Figure 5) between left and right
side of cabin.
22. Remove air ducts (1, 2, 3, 4 and 5, Figure 6) right side of
cabin step by step from the front duct.
23. Disconnect washer hose located at floor plate bottom.
24. Disconnect cabin wiring connectors from main harness.
25. Remove four mounting nuts from four corners of cabin floor
(1, Figure 7).
26. Remove four M12 hex bolts (2, Figure 7) and two M10 hex
bolts (3, Figure 7).
Figure 5
Figure 6
Figure 7

14. SP001737
Page 9
Cabin
27. Using a suitable lifting device, attach slings to four lift
points on top of cab (Figure 8).
NOTE: Cabin weights approximately 315 kg (700 lb).
28. Lift cab from 25 ~ 50 mm (1" ~ 2") above deck height.
Check that all electrical connections have been
disconnected and all other items unbolted.
29. Continue lifting with the assist crane to remove the cab
shell. Lower the shell to a prepared safe blocking support.
Figure 8

15. SP001737Cabin
Page 10
INSTALLATION
1. Using a suitable lifting device, attach slings to four lift
points on top of cab (Figure 9).
NOTE: Cabin weights approximately 315 kg (700 lb).
2. Lower cab into position on cab floor.
3. Install four mounting nuts from four corners of cabin floor
(1, Figure 10).
NOTE: Mounting nut torque 21 kg•m (205 N•m,
150 lbf ft).
4. Install four M12 hex bolts (2, Figure 10) and two M10 hex
bolts(3, Figure 10).
NOTE: Mounting nut torque
M12 - 11 kg•m (108 N•m, 80 lbf ft).
M10 - 6.5 kg•m (64 N•m, 47 lbf ft).
5. Once cab is mounted to floor, unhook lifting device.
6. Connect cabin wiring connectors to main harness.
7. Connect washer hose located at floor plate bottom.
8. Install air ducts (1, 2, 3, 4 and 5, Figure 11) right side of
cabin step by step from the rear duct.
Figure 9
Figure 10
Figure 11

16. SP001737
Page 11
Cabin
9. Install across bar (5, Figure 12) between left and right side
of cabin.
10. Install air ducts (1, 2, 3 and 4, Figure 12) from cabin rear
panel.
11. Install electric box (4, Figure 13).
12. Install cassette bracket (2, Figure 13) and connet antenna
and speaker wire.
13. Connect cabin gound cable located near fuse box bracket.
14. Install fuse box bracket (1, Figure 13) to left side wall of
the cab.
15. Install rear side covers (4 and 5, Figure 14), cassette cover
(3, Figure 14) and rear center cover (2, Figure 14), last
install rear mat (1, Figure 14).
Figure 12
Figure 13
Figure 14

17. SP001737Cabin
Page 12
16. Install front cover (4, Figure 15), and side covers (5 and 6,
Figure 15), when install cover (4, Figure 15) connect hour
meter connector.
17. Install seat (2, Figure 15).
NOTE: Be careful not to damage seat covering.
18. Install floor mat (1, Figure 15).
19. Connect negative (-) battery cable leading to frame from
battery.
Figure 15

18. SP001738Counterweight
Page 6
GENERAL
Warning for Counterweight and Front
Attachment Removal
Before any attempt is made to begin removal or installation of
the counterweight, the excavator must be parked on a firm and
level supporting surface, with no sloping surfaces or soft or
muddy ground in the area where the assist lift crane will be
working. Position all accessories in the overnight storage
position.
Responsibility should be assigned to one person to be in charge
of the lifting crew, and to verify that required safe lifting
precautions have been taken before each part of this procedure
has been started.
All members of the working crew should know and understand
the signals that will be used between the lifting leader, the assist
crane operator and the remainder of the work crew.
FG000371
Figure 1
DANGER
DOOSAN warns any user, that the removal of the
counterweight from the machine, front attachment or any
other part, may affect the stability of the machine. This
could cause unexpected movement, resulting in death or
serious injuries. DOOSAN is not liable for any misuse.
Never remove the counterweight or front attachment unless
the upper structure is in-line with the lower structure.
Never rotate the upper structure once the counterweight or
front attachment has been removed.
WARNING
The weight of counterweight is given in the following table.
Use only rated and approved slings and hardware when
removal or installation lifts are being made. Lifting slings,
shackles and all other hardware must be rigged safely. An
assist crane that is rated above weight capacity is required.
Model Weight of Counterweight
DX340LC
7,100 kg (15,653 lb)
DX350LC

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20. SP001738
Page 7
Counterweight
To maintain stability the counterweight should be removed
whenever the front attachment is taken off the machine.
When loading an excavator (either track or wheeled type) on a
trailer for transport after the front attachment has been removed,
always go backwards up the loading ramp. The counterweight
end of the deck has to get on the trailer first, while the cabin is
still going up the ramp (Figure 1).
WARNING
If the turntable deck has been unbalanced by removal of
weight from one end only, traveling the excavator, swinging
the turntable, movement over bumps or sloping and uneven
surfaces could cause loss of control and possible
accidents or injuries.
FG00032515
90 ~ 110
Figure 1
FG000326
15
Figure 2

21. SP001738Counterweight
Page 8
REMOVAL
1. Park on firm and level ground.
2. Lower front attachment (bucket) to the ground.
3. Shut down engine.
4. Set safety lever on "RELEASED" position.
5. Turn starter switch to "I" (ON) position.
6. Fully stroke work levers (joysticks) in all directions to
relieve any pressure from accumulators.
7. Set safety lever on "LOCK" position.
8. Turn key to "O" (OFF) position and remove from starter
switch.
9. Hang maintenance warning tag on controls.
10. Disconnect the battery cable from the negative (-) battery
terminal.
11. Remove engine compartment cover.
12. Using a suitable lifting device capable of handling a heavy
load, partially support counterweight (1, Figure 4) before
loosening four bolts (2). Stop lifting with assist crane as
soon as lifting slings are taut.
13. Remove four bolts (2, Figure 4) and washers (3) from
counterweight (1).
NOTE: Heat bolts if necessary, to free them.
14. When bolts (2, Figure 4) and washers (3) have been
removed, lift counterweight (1) a very short distance above
support frame (4) and stop. Check slings and make sure
counterweight is being supported evenly.
O I
FG014348
DO NOT OPERATE
when performing inspection
WARNING
190-00695A
or maintenance
Figure 3
WARNING
If engine must be run while performing maintenance,
use extreme care. Always have one person in the
cabin at all times. Never leave the cabin with the
engine running.
Figure 4
1
2
3
4
5
FG014381

22. SP001738
Page 9
Counterweight
INSTALLATION
1. Using suitable lifting device capable of handling a heavy
load, raise counterweight (1, Figure 5) into position just
above support frame (4) leaving counterweight suspended.
Verify that counterweight is level and even.
NOTE: Leave counterweight (1, Figure 5) suspended
3 mm (0.125") above support frame (4) until all
four mounting bolts (2) are started in
counterweight mounting holes.
2. Slide washers (3, Figure 5) onto bolts (2). Apply Loctite
#242 to mounting bolt threads.
3. Install four bolts (2, Figure 5) with washers (3) into
counterweight until washers contact support frame. Fully
lower counterweight onto support frame and finish
tightening bolts.
NOTE: Torque bolts (2, Figure 5) to values shown in
following table.
4. Remove lifting device and lifting eyes from counterweight
lifting holes (5, Figure 5).
5. Install engine compartment cover.
6. Connect negative (-) battery cable to battery.
Figure 5
1
2
3
4
5
FG014381
Model Bolt Torque
DX340LC
250 kg•m (1,807 ft lb)
DX350LC