The document provides instructions for maintaining and servicing the swing bearing and track assembly on a DX380LC-3 excavator. It describes how to measure axial play and lateral play in the swing bearing to check its condition. Disassembly and assembly procedures are outlined for the swing bearing. Instructions are also provided for checking and adjusting track tension, including recommended clearance distances between the track and side frame for different operating conditions. Safety warnings emphasize the need for two people, one operating controls, when measuring track tension.

1. Original InstructionsCopyright DOOSAN 2012
Serial Number 10001 and Up
Shop Manual
DX380LC-3 Excavator
950106-00228E
April 2012
DOOSAN and the DOOSAN logo are registered
trademarks of DOOSAN Corporation in the United
States and various other countries around the
world.

2. Table of Contents
Page I
1Table of Contents
Safety
Track Excavator Maintenance Safety................................................... SP002322
Specifications
Specification for DX380LC-3 ................................................................ SP002604
General Maintenance
General Maintenance Instructions........................................................ SP002454
Standard Torques................................................................................. SP002404
Upper Structure
Cabin .................................................................................................... SP002324
Counterweight....................................................................................... SP002606
Fuel Tank.............................................................................................. SP002410
Fuel Transfer Pump (Option)................................................................ SP002394
Swing Bearing....................................................................................... SP002329
Lower Structure and Chassis
Track Assembly .................................................................................... SP002607
Engine and Drivetrain
Engine Coolant Heater (Option) ........................................................... SP002328
Drive Coupling (Main Pump)................................................................. SP002411
Hydraulics
Hydraulic System Troubleshooting, Testing and Adjustment ............... SP002412
Accumulator.......................................................................................... SP002455
Center Joint (Swivel)............................................................................. SP002545
Cylinders............................................................................................... SP002422

3. Table of Contents
Page II
Swing Device........................................................................................ SP002413
Travel Device........................................................................................ SP002609
Main Pump............................................................................................ SP002415
Gear Pump ........................................................................................... SP002568
Fan Motor for Oil Cooler ....................................................................... SP002552
Fan Pump ............................................................................................. SP002553
Main Control Valve ............................................................................... SP002416
Remote Control Valve (Work Lever / Joystick)..................................... SP002450
Travel Control Valve (with Damper)...................................................... SP002381
Solenoid Valve Assembly ..................................................................... SP002406
Breaker EPPR Valve (Option) .............................................................. SP002458
Hydraulic Schematic............................................................................. SP002610
Electrical System
Electrical System .................................................................................. SP002418
Electrical Schematic ............................................................................. SP002419
Attachments
Boom and Arm...................................................................................... SP002605
Bucket................................................................................................... SP002421

4. SP002322
Page 1
Track Excavator Maintenance Safety
SP002322
TRACK EXCAVATOR MAINTENANCE SAFETY
SP002322
Track Excavator
Maintenance
Safety
Edition 3

5. SP002322
Page 5
Track Excavator Maintenance Safety
SAFETY INSTRUCTIONS
APPLICABLE MODELS
The contents of this section apply to the following models and
serial number ranges.
WARNING
AVOID DEATH OR SERIOUS INJURY
Instructions are necessary before operating or servicing
machine. Read and understand the Operation and
Maintenance Manual and signs (decals) on machine. Follow
warnings and instructions in the manuals when making
repairs, adjustments or servicing. Check for correct
function after adjustments repairs or service. Untrained
operators and failure to follow instructions can cause death
or serious injury.
MODEL SERIAL NUMBER RANGE
DX140LC-3 1001 and Up, 50001 and Up
DX180LC-3 1001 and Up, 50001 and Up
DX225LC-3 1001 and Up, 50001 and Up
DX255LC-3 1001 and Up, 50001 and Up
DX300LC-3 1001 and Up, 50001 and Up
DX340LC-3 1001 and Up, 10001 and Up
DX350LC-3 1001 and Up, 10001 and Up
DX380LC-3 10001 and Up
DX420LC-3 10001 and Up
DX490LC-3 10001 and Up
DX530LC-3 10001 and Up

6. SP002322Track Excavator Maintenance Safety
Page 6
SAFETY MESSAGES
Safety messages and safety decals included in this manual and
on the machine provide instructions how to operate, service and
maintain the machine. Safety messages and safety decals
indicate potential hazards and describe safety precautions
required to avoid hazards. Operator and maintenance personnel
should read and understand these safety messages and decals
before beginning operation or maintenance.
Signal Words
The signal words "DANGER", "WARNING", "CAUTION" are
used throughout safety messages and safety decals in this
manual or on the machine. They indicate an existence of, and
the relative seriousness of, a hazard. All three indicate that a
safety risk is involved. Observe the precautions indicated
whenever a Safety Alert Symbol is present, no matter which
signal word appears next to it.
SAFETY ALERT SYMBOL
Be Prepared - Get to Know All Operating and Safety
Instructions.
This is a Safety Alert Symbol. Wherever it appears in this
manual or on safety decals on the machine, you must be
alert to the potential for personal injury or accidents.
Always observe safety precautions and follow
recommended procedures.
DANGER
DANGER - This signal word is used on safety messages and
safety labels and indicates an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
WARNING
WARNING - This signal word is used on safety messages and
safety labels and indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury.

7. SP002322
Page 7
Track Excavator Maintenance Safety
Other Signal Words
In addition to safety signal words, the following signal words are
used to indicate proper and effective use of machine.
The word "NOTE" identifies information for effective use.
SAFETY DECALS
Location of safety labels (decals) can vary from unit to unit.
Refer to appropriate Operation and Maintenance Manual, and
parts manual for your unit.
Always replace damaged or faded decals.
CAUTION
CAUTION - This signal word is used on safety messages
and safety labels and indicates a potentially hazardous
situation which, if not avoided, could result in minor or
moderate injury.
IMPORTANT
This signal word identifies procedures which must be
followed to avoid damage to machine.

8. SP002322Track Excavator Maintenance Safety
Page 8
GENERAL
Safe Operation is Operator's
Responsibility
Only trained and authorized personnel should operate and
maintain the machine.
Follow all safety rules, regulations and instructions when
operating or performing maintenance on machine.
• Do not operate machine if you are under the influence of
drugs or alcohol. An operator who is taking prescription
drugs must get medical advice to determine if he or she
can safely operate a machine.
• When working with other personnel on a work site, be sure
that all personnel know nature of work and understand all
hand signals that are to be used.
• Be sure that all guards and shields are installed in their
proper location. Have guards and shields repaired or
replaced immediately if damaged.
• Be sure that you understand the use and maintenance of
all safety features such as safety lock lever and seat belt.
Use them properly.
• Never remove, modify or disable any safety features.
Always keep them in good operating condition.
• Always check for and know the location of underground
and overhead utility lines before excavating.
• Failure to use and maintain safety features according to
instructions in this manual, Safety Manual and Shop
Manual can result in death or serious injury.
Know Your Machine
Know how to operate your machine. Know the purpose of all
controls, gauges, signals, indicators and monitor displays. Know
the rated load capacity, speed range, braking and steering
characteristics, turning radius and operating clearances. Keep in
mind that rain, snow, ice, loose gravel, soft ground, slopes etc.,
can change operating capabilities of your machine.
Proper Work Tools and Attachments
Only use work tools and attachments that are recommended by
DOOSAN for use on DOOSAN machines. When installing and
using optional attachments, read instruction manual for
attachment, and general information related to attachments in
this manual. Because DOOSAN cannot anticipate, identify or
test all attachments that owners may want to install on their
machines, contact DOOSAN for written authorization and

9. SP002322
Page 9
Track Excavator Maintenance Safety
approval of attachments, and their compatibility with optional
kits.
Attachments and attachment control systems that are
compatible with the machine are required for safe and reliable
machine operation. Do not exceed maximum operating weight
(machine weight plus attachment) that is listed on ROPS
certification plate.
Make sure that all guards and shields are in place on machine
and on work tool. Depending on type or combination of work
equipment, there is a potential that work equipment could
interfere with the cabin or other parts of machine. Before using
unfamiliar work equipment, check if there is any potential of
interference, and operate with caution.
While you are performing any maintenance, testing, or
adjustments to attachments, stay clear of the following areas:
cutting edges, pinch points, and crushing surfaces.
Never use attachment as a work platform or manlift.
Contact your DOOSAN distributor about auxiliary hydraulic kits
for attachments installation. If you are in doubt about
compatibility of a particular attachment with a machine, consult
your DOOSAN distributor.
Pressurized Fluids
Pressurized air or fluids can cause debris and/or fluids to be
blown out. This could result in death or serious injury.
Immediately after operations are stopped, coolant, engine oil,
and hydraulic oil are at their highest temperatures and the
radiator and hydraulic tank are still under pressure. Always wait
for temperature to cool down. Follow specified procedures when
attempting to remove caps, drain oil or coolant, or replacing
filters. Always wait for temperature to cool down, and follow
specified procedures when performing these operations. Failure
to do so can result in death or serious injury.
When pressurized air and/or pressurized water is used for cleaning,
wear protective clothing, protective shoes, and eye protection. Eye
protection includes goggles or a protective face shield.
Pressure can be trapped in a hydraulic system and must be
relieved before maintenance is started.
Releasing trapped pressure can cause sudden machine
movement or attachment movement. Use caution if you
disconnect hydraulic lines or fittings.
High-pressure oil that is released can cause a hose to whip or oil
to spray. Fluid penetration can result in death or serious injury. If
fluid enters skin or eyes, get immediate medical attention from a
physician familiar with this injury.
Obey all local laws and regulations for disposal of liquids.
To prevent hot coolant from spraying out, stop engine and wait for
coolant to cool. Using gloves, slowly loosen cap to relieve pressure.
FG018457
Figure 1

10. SP002329
Page 1
Swing Bearing
SP002329
SWING BEARING SP002329
Swing Bearing
Edition 3

11. SP002329
Page 5
Swing Bearing
SAFETY INSTRUCTIONS
APPLICABLE MODELS
The contents of this section apply to the following models and
serial number ranges.
WARNING
AVOID DEATH OR SERIOUS INJURY
Instructions are necessary before operating or servicing
machine. Read and understand the Operation and
Maintenance Manual and signs (decals) on machine. Follow
warnings and instructions in the manuals when making
repairs, adjustments or servicing. Check for correct
function after adjustments repairs or service. Untrained
operators and failure to follow instructions can cause death
or serious injury.
MODEL SERIAL NUMBER RANGE
DX140LC-3 1001 and Up, 50001 and Up
DX180LC-3 1001 and Up, 50001 and Up
DX225LC-3 1001 and Up, 50001 and Up
DX255LC-3 1001 and Up, 50001 and Up
DX300LC-3 1001 and Up, 50001 and Up
DX340LC-3 1001 and Up, 10001 and Up
DX350LC-3 1001 and Up, 10001 and Up
DX380LC-3 10001 and Up
DX420LC-3 10001 and Up
DX490LC-3 10001 and Up
DX530LC-3 10001 and Up

12. SP002329Swing Bearing
Page 6
SWING BEARING
MAINTENANCE
Operating Recommendation
The service life of the swing bearing may be extended if a daily
effort is made to equalize usage over both ends of the
excavator. If the excavator is used in the same operating
configuration day in and day out (for example, with the travel
motors always under the counterweight, or with the attachment
over one side of the machine more than the other), the bearing's
service life could be reduced. Repositioning the excavator
during the work shift, to work the opposite end of the bearing,
will provide a more even and gradual rate of wear and extended
service life.
Measuring Swing Bearing Axial Play
Regular checks of bearing displacement must be made at least
twice a year. Use a dial indicator. Push the attachment against
the ground to lift up the excavator above the ground and take
measurements at 4 points, 90° apart, around the circumference
of the bearing (Figure 1).
Record and keep all measurements. Play in the bearing should
increase minimally from one inspection to the next. Eventually,
however, as the bearing begins to approach the limit of its
service life, clearance increases become much more
pronounced and the actual measured play in the bearing could
exceed twice the value that was measured when the machine
was new.
Measuring Bearing Lateral Play
When vertical checks are made, the side to side play in the
bearing can be checked by fully retracting the arm and bucket
cylinders and extending the tip of the bucket as far forward as it
will go. With the excavator parked on a flat, level surface and the
bucket tip just off the ground, push against the bucket sideways
to take up all the lateral clearance in the bearing. (Less than 100
lb of force must be required to move the bucket over all the
way.) Check lateral play in both directions and record the values.
When the bearing is beginning to approach the end of its service
life, the measured lateral clearance should start to show
increase in value.
FG018734
1
2
Figure 1

13. SP002329
Page 7
Swing Bearing
Swing Bearing Basic Operation
The swing bearing, which connects the upper structure with the
lower structure, consists of a inner ring, outer ring and ball
bearings. During swing movement, power from the swing motor
is transferred to the pinion by planetary gears connected to
gears on the inner ring, which is fixed in the undercarriage. Ball
bearings turn the outer ring.
Disassembly
1. Remove tip of tapered pin (3, Figure 3) using grinder and
tap lightly to remove debris.
2. Remove plug (4, Figure 4) using a M10 x P 1.5 bolt.
Figure 2
Reference
Number
Description
1 Outer Ring
2 Inner Ring
3 Tapered Pin
4 Plug
5 Ball
6 Retainer
7 Seal
Figure 3
Figure 4

14. SP002329Swing Bearing
Page 8
3. Lift outer ring and check that inner ring can move freely.
See Figure 5, if not, replace seal (7, Figure 6).
4. Turn inner ring and use magnet bar (C, Figure 6) to
remove steel balls (5).
5. Turn inner ring and use wire (D, Figure 7) to remove
retainers (6).
Figure 5
Figure 6
Figure 7

15. SP002329
Page 9
Swing Bearing
Assembly
1. Clean (degrease) the seal groove for the outer and inner
seals (7).
Apply instant glue to seal (7).
Install both seals respectively into position.
2. Hoist the outer race by crane horizontally and match it with
the inner race coaxially.
Rotating the outer race, insert balls (5), support (6) into the
plug (4) hole one by one with a round bar.
3. Top plug (4) into outer race (1) and then, drive pin (3) into
the pinhole.
Caulk the head of pin (3) with a punch.
Fill grease through the grease fitting.
Figure 8
Figure 9
Figure 10
Figure 11

16. SP002607
Page 1
Track Assembly
SP002607
TRACK ASSEMBLY SP002607
Track
Assembly
Edition 1

17. SP002607
Page 7
Track Assembly
TRACK TENSION
Track shoe link pins and bushings wear with normal usage,
reducing track tension. Periodic adjustment is necessary to
compensate for wear and it may also be required by working
conditions.
1. Track tension is checked by jacking up one side of the
excavator. See Figure 1. Place blocking under frame while
taking measurement.
Turn the track backward by 1 - 2 turns.
2. Measuring the distance (A, Figure 2) between the bottom
of the side frame and the top of the lowest crawler shoe.
Recommended tension for operation over most types of
terrain is distance "B" in below table.
NOTE: Clean off the tracks before checking clearance
for accurate measurements.
3. Too little sag in the crawler track (less than clearance
distance "B" in below table) can cause excessive
component wear. The recommended adjustment can also
be too tight causing accelerated stress and wear if ground
conditions are wet, marshy or muddy.
WARNING
AVOID DEATH OR SERIOUS INJURY
Measuring track tension requires two people. One person
must be in the operator's seat, operating the controls while
the other person makes dimensional checks. Block frame to
make sure the machine won't move or shift position during
service. Warm up the engine to prevent stalls, park the
excavator in an area that provides level, uniform ground
support and/or use support blocks when necessary.
The track adjusting mechanism is under very
high-pressure. NEVER release grease pressure too fast.
The track tension grease valve should never be loosened
more than one (1) complete turn from the fully tightened
down position. Bleed off grease pressure slowly. Keep your
body away from the valve always. Always wear eye and face
protection when adjusting track tension.
FG018383
90 ~ 110
Figure 1
A
FG000223
Figure 2

18. SP002607Track Assembly
Page 8
4. The increased clearance recommended for muddy, sandy
or snowy ground conditions is between distance "C" in the
below table.
5. Track tension adjustments are made through the grease
fitting (1, Figure 3) in the middle of each side frame. Adding
grease increases the length of an adjustment cylinder (2).
Extending the adjustment cylinder, increases the pressure
on the tension spring pushing the track idler wheel
outward.
6. If there is not enough slack or clearance in the tracks and
the adjustment is too tight, the idler wheel and adjusting
cylinder can be retracted by bleeding off grease through
hole in adjustment cylinder (2, Figure 3).
Terrain Type
Recommended
Distance "A"
Normal "B"
380 - 410 mm
(14.96 - 16.14 in)
Muddy, Sandy or Snowy "C"
410 - 460 mm
(16.14 - 18.11 in)
WARNING
AVOID DEATH OR SERIOUS INJURY
The track adjusting mechanism is under very high-
pressure. NEVER release grease pressure too fast.
The track tension grease valve should never be
loosened more than one (1) complete turn from the
fully tightened down position. Bleed off grease
pressure slowly. Keep your body away from the valve
always. Always wear eye and face protection when
adjusting track tension.
2
1
3
FG018365
Figure 3

19. SP002607
Page 9
Track Assembly
CLEANING AND INSPECTION
(WEAR LIMITS AND
TOLERANCES)
The tables that follow provide factory specified dimensional
limits (as new condition, recommended service and replacement
limit) for lower travel frame components.
Recommended maintenance to replace most listed components
requires welding on additional material and grinding off excess.
Some components must be replaced before the service limit is
exceeded. No maintenance or renewal is possible.
Compare the values in the tables with dimensions and profiles
shown in the adjacent figures.
CAUTION
AVOID INJURY
Refer to "Welding Precautions and Guidelines" information
in "General Maintenance Procedures" section for general
recommendations and specific safety precautions, before
starting any lower travel frame component rebuilding
procedure.

20. SP002607Track Assembly
Page 10
Track Shoe
8
7
2
7
2
10
119
FG018732
1
36
4 5
Figure 4

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22. SP002607
Page 11
Track Assembly
No. Check Item Standard Dimension
Recommended Limit
for Maintenance
Limit for Use
(Repair - P or
Replace - R)
1 Link Pitch
215.9 mm
(8.50")
2
Bushing Outside
Diameter
71.4 mm
(2.81")
68 mm
(2.68")
66 mm (R)
(2.60")
3 Link Height
129 mm
(5.08")
126 mm
(4.96")
122 mm (P)
(4.80")
4 Length at Tip
24 mm
(0.94")
5 Length at Tip
18 mm
(0.71")
6 Height
36 mm
(1.42")
32 mm
(1.26")
30 mm
(1.18")
7
Interference between
bushing and link
Bushing Tolerance Link Tolerance
Standard
Interference
Repair
Limit
71.4 mm
(2.81")
+0.050
0.0
71 mm
(2.80")
+0.074
0
0.326 -
0.450
8
Interference between
regular pin and link
Regular
Pin
Tolerance Link Tolerance
Standard
Interference
Repair
Limit
47 mm
(1.85")
+0.285
+0.135
46.8 mm
(1.84")
+0.062
0
0.273 -
0.485
9
Clearance between
regular pin and bushing
Regular
Pin
Tolerance Bushing Tolerance
Standard
Clearance
Repair
Limit
47mm
(1.85")
+0.285
+0.135
47.9 mm
(1.89")
+0.5
0
0.615 -
1.265
10
Interference between
master pin and link
Master Pin Tolerance Link Tolerance
Standard
Interference
Repair
Limit
47 mm
(1.85")
+0.11
+0.08
46.8 mm
(1.84")
+0.062
0
0.218 -
0.310
11
Clearance between
master pin and bushing
Master Pin Tolerance Bushing Tolerance
Standard
Clearance
Repair
Limit
46.8 mm
(1.84")
0
-0.2
47.9 mm
(1.89")
+0.5
0
1.100 -
1.800

23. SP002607Track Assembly
Page 12
Lower Roller
5
6
2
1
3 4
FG018733
Figure 5
No. Check Item Standard Dimension
Recommended Limit for
Maintenance
Limit for Use
(Repair - P or
Replace - R)
1
Outside Diameter of
Flange
250 mm
(9.84")
2
Outside Diameter of
Tread
200 mm
(7.87")
194 mm
(7.64")
190 mm (P)
(7.48")
3 Width of Tread
55 mm
(2.17")
64 mm
(2.52")
71 mm (P)
(2.80")
4 Width of Flange
35 mm
(1.38")
5
Clearance between
shaft and bushing
Standard
Dimension
Tolerance Standard
Clearance
Repair
LimitShaft Hole
85 mm
(3.35")
-0.08
-0.13
+0.50
+0.45
0.530 - 0.630
1.8 mm (R)
(0.07")
6
Interference between
roller and bushing
Standard
Dimension
Tolerance Standard
Interference
Repair
LimitShaft Hole
92 mm
(3.62")
+0.23
+0.18
+0.030
-0.020
0.150 - 0.250

24. SP002607
Page 13
Track Assembly
Upper Roller
4 3
5
6
2
1
FG004352
Figure 6
No. Check Item Standard Dimension
Recommended Limit for
Maintenance
Limit for Use
(Repair - P or
Replace - R)
1
Outside Diameter of
Flange
210 mm
(8.27")
2
Outside Diameter of
Tread
180 mm
(7.09")
171 mm
(6.73")
162.5 mm (P)
(6.40")
3 Width of Tread
47.5 mm
(1.87")
4 Width of Flange
17.5 mm
(0.69")
11.5 mm
(0.45")
5
Clearance between
shaft and bushing
Shaft Tolerance Bushing Tolerance
Standard
Clearance
Repair
Limit
60 mm
(2.36")
-0.05
-0.10
60 mm
(2.36")
+0.40
+0.34
0.390 -
0.500
6
Interference between
roller and bushing
Standard
Dimension
Tolerance Standard
Interference
Repair
LimitShaft Hole
68 mm
(2.68")
+0.19
+0.13
+0.03
-0.02
0.100 -
0.210