Part of the Doosan Repair Manuals.
Hunting for a Doosan DX140LC shop manual PDF that also covers its bigger siblings? This 776-page factory shop manual (OEM #K1034080E) handles the DX140LC, 180LC, 225LC, 225NLC, 255LC, 300LC, and 340LC track excavators in one download. Inside you get full hydraulic schematics, complete electrical schematics for chasing sensor and relay faults, and a hydraulic troubleshooting section with testing and adjustment procedures for the main pump, swing motor, and travel motors. Torque tables run from 0.15 to 103.00 kg•m on metric fasteners, plus U.S. and phosphate-coated hardware charts. Set the boom overload relief valve at 360 kg/cm2 (5,112 psi), and fit 10 micron filters on both the return line and pilot circuit. Cylinder drift on your boom at 2 a.m. is no time for forum guesses. Bookmarked with a live text layer; search any spec and get wrenching.
What's Inside This Doosan DX140LC Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-52 | Track Excavator Safety |
| Specifications | 53-78 | Specification for DX140LC |
| General Maintenance | 79-116 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 117-214 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 215-246 | Track Assembly |
| Engine and Drive Train | 247-260 | Drive Coupling (Main Pump) |
| Hydraulic System Troubleshooting, Testing and Adjustment | 263-298 | Main Pump Assembly, Hydraulic Control Valve, Swing Motor, Travel Motor, Boom Cylinder, Arm Cylinder, Bucket Cylinder |
| Accumulator | 299-346 | Center Joint (Swivel), Cylinders |
| Swing Motor | 347-382 | Anticavitation Check Valve, Relief Valve, Swing Reactionless Valve, Brake Part, Driveshaft, Cylinder Block |
| Travel Moter | 383-454 | Reduction Gear, Hydraulic Motor, Brake Valve, Parking Brake, Swash Plate, Cylinder Block |
| Main Pump | 455-492 | Gear Pilot Pump, Relief Valve, Pump Regulator, Swash Plate, Rotary Group, Valve Block |
| Main Control Valve | 493-542 | Anti-Drift Valve, Relief Valve, Load Check Valve, Neutral Cut Spool, Check Valve |
| Remote Control Valve (Work Lever / Joystick) | 543-590 | Travel Control Valve (with Damper) |
| Solenoid Valve Assembly | 591-623 | Breaker EPPR Valve (Opt), Hydraulic Schematic (DX140LC) |
| Electrical System | 624-752 | Electrical Schematic (DX140LC) |
| Attachments | 753-776 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Max. Torque | 44.5 kg•m @ 1,400 rpm | p. 69 |
| Standard Metric Fasteners Torque | 0.15 kg•m to 103.00 kg•m | p. 106 |
| Hydraulic reservoir return line filter rating | 10 micron | p. 270 |
| Pilot circuit filter rating | 10 micron | p. 270 |
| Boom operating circuit overload relief valve pressure | 360 kg/cm2 (5,112 psi) | p. 271 |
| Boom up secondary pilot pressure | 7 - 9 kg/cm2 (100 - 130 psi) | p. 271 |
| Clearance between spindle and thrust plate | 0.5 mm (0.020") | p. 315 |
| Clearance between spindle and body | 0.1 mm (0.0039") | p. 315 |
| Engine control dial output voltage (1st step) | 4.0V | p. 72 |
| Engine control dial output voltage (7th step) | 2.5V | p. 290 |
| Rated voltage | 24V | p. 717 |
| Rated current | 20A | p. 717 |
Doosan DX140LC Common Problems This Manual Covers
Doosan DX140LC hydraulic power fades when hot, boom and arm slow, digging force drops
Check main relief pressure at the test port; the DX140LC spec on page 72 calls for 330 kg/cm2 in normal mode. If pressure sags as the oil warms, suspect internal pump leakage. Replace the 10 micron return line filter (page 270) and inspect the reservoir intake strainer before condemning the pump.
Manual Section: Hydraulic System Troubleshooting p. 72Hydraulic oil temperature climbs during normal digging, all functions turn sluggish within an hour
Clean the oil cooler fins with compressed air and clear any debris blocking airflow between the cooler and radiator. Work through the high oil temperature chart starting. Drain and refill if the oil is contaminated, then retorque hydraulic hose clamps to 0.5 to 0.6 kg•m so suction lines seal tight.
Manual Section: Hydraulic Problems TroubleshootingHydraulic oil leaking from center joint, oil streaks down inside of undercarriage frame
Remove the center joint and inspect the O-rings and sliding surfaces for scoring or embedded grit. Measure spindle clearances against the limits on page 315: 0.5 mm (0.020 in) between spindle and thrust plate, 0.1 mm between spindle and body. Replace seals as a complete kit and keep the bore spotless during assembly.
Manual Section: Hydraulics p. 315Engine rpm stuck at idle, throttle dial has no effect on engine speed
Check the fuse and the connectors at the speed control dial before pulling parts. Measure dial output voltage while clicking through the steps; you should read 2.5V at the seventh step per page 290. No voltage change means a failed dial. Correct voltage with no rpm response points to the speed control motor or e-EPOS controller.
Manual Section: Electrical System p. 290All attachment functions dead after engine starts, joysticks feel normal but nothing moves
Verify the safety lever is fully down; the pilot cutoff solenoid kills every function when it sits halfway. Test pilot pressure at the accumulator port and confirm the accumulator holds its 10 kg/cm2 charge (page 306). Replace the 10 micron pilot circuit filter if pressure runs low, then recheck before pulling the pilot pump.
Manual Section: Hydraulic System Troubleshooting p. 306Frequently Asked Questions
How do I check Doosan DX140LC trouble codes?
To check trouble codes, pull out the e-EPOS indicator panel from underneath the operator's seat and perform the self-diagnostic test. If the display panel reads code '0.2', it indicates the swing priority proportional valve is not functioning, except in the minimum 'fail-safe' mode. p. 291
What is the torque specification for the DX140LC swing motor?
The tightening torque for the M36 (M24) RO plug on the swing motor is 2450 ± 250 kg•cm (1300 ± 100 kg•cm for TSM72). p. 369
How do I reset the Doosan DX140LC error code?
To delete a failure record, select the 'Delete Fail Log' mode in the special menu. When 'YES' is pressed, the memorized record will be deleted. This screen will be displayed for 3 seconds. p. 669
What is the fuel tank capacity for the DX140LC?
The fuel tank capacity for the DX140LC is 267 liters (70.5 U.S. gal). p. 147
What is the tightening torque for the main unit mounting bolts on the travel motor?
The tightening torque for the main unit mounting bolts on the travel motor is 252 ± 39.2 N•m (25.7 ± 4.0 kg•m). p. 402
Will this Doosan DX140–DX340 Series Shop Manual download right away?
Immediate download of the complete 776-page searchable Shop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this Doosan DX140–DX340 Series manual?
Yes. The PDF is DRM-free, so printing works from any reader and any printer.
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