Part of the Doosan Repair Manuals.
Need the factory numbers for your Doosan DX140LC-3? This 900-page Doosan DX140LC-3 shop manual PDF (OEM #950106-00388E) covers the full excavator, and the same procedures apply to the 180LC-3, 225LC-3, 255LC-3, and 300LC-3. Inside: complete electrical schematics for the starting, charging, monitoring, and A/C circuits, full hydraulic schematics with pump regulator and main control valve breakdowns, and step-by-step teardowns for the swing motor, travel device, main pump, and cylinders. You also get a dedicated hydraulic troubleshooting, testing, and adjustment section with pilot pressures and performance tests. Set boom-up secondary pilot pressure at 7 to 9 kg/cm2 (100 to 130 psi), and spec the return line filter at 10 micron, not whatever the parts counter guesses. Chasing a swing fault without a schematic wastes your whole afternoon. Bookmarked, keyword-searchable, and readable on your phone right at the machine.
What's Inside This Doosan DX140LC-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-72 | Track Excavator Maintenance Safety |
| Specifications | 73-102 | Specifications for DX140LC-3 |
| General Maintenance | 103-140 | Standard Torques |
| Upper Structure | 141-242 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 243-274 | Track Assembly |
| Engine and Drivetrain | 275-304 | Engine Coolant Heater, Drive Coupling |
| Hydraulic System Troubleshooting, Testing and Adjustment | 305-340 | Troubleshooting, Pilot Pressure, Power Mode Valve, Pressure Up Valve, Pump Regulator |
| Accumulator | 341-348 | Accumulator Operation, Precharge Pressure, Specifications |
| Center Joint (Swivel) | 349-362 | Center Joint Inspection, Testing, Disassembly, Reassembly |
| Cylinders | 363-402 | Cylinder Operation, Disassembly, Reassembly, Piston Nut, Slipper Seal |
| Swing Motor | 403-438 | Brake Valve, Brake Piston, Brake Spring, Valve Plate, Motor Casing, Relief Valve |
| Travel Device | 439-510 | Hydraulic Motor, Cylinder Block, Timing Plate, Spindle, Planetary Hub, Floating Seal, Angular Ball Bearing |
| Main Pump | 511-548 | Main Pump Operation, Pump Regulator, Disassembly, Reassembly, Performance Characteristics |
| Gear Pump, Main Control Valve, and Other Hydraulic Components | 549-708 | Gear Pump, Main Control Valve, Breaker EPPR Valve, Dozer Valve, Hydraulic Schematic |
| Electrical System | 709-874 | Electrical Supply System, Engine Starting Circuit, Charging System, Monitoring System, Engine Control System, Air Conditioner System |
| Attachments | 875-900 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel Tank Capacity | 265 liters (70 U.S. gal) | p. 90 |
| Hydraulic reservoir return line filter rating | 10 micron | p. 314 |
| Pilot circuit filter rating | 30 micron | p. 314 |
| Hydraulic system operating temperature | 50°C (122°F) | p. 314 |
| Boom up secondary pilot pressure | 7 - 9 kg/cm2 (100 - 130 psi) | p. 315 |
| Boom down secondary pilot pressure | 7 - 9 kg/cm2 (100 - 130 psi) | p. 315 |
| Swing relief valve pressure | 265 - 275 kg/cm2 (3,769 - 3,911 psi) | p. 332 |
| Hydraulic fluid change interval | 1,000 hours or one year | p. 461 |
| Required oil volume in casing | 1.0 liters | p. 459 |
| Main Pump Displacement | 63 cc/rev (3.84 in³/rev) | p. 530 |
| Battery voltage | 12 volts | p. 719 |
| Battery capacity | 150AH | p. 721 |
Doosan DX140LC-3 Common Problems This Manual Covers
Doosan DX140LC-3 slow boom and arm movement, weak digging force, hydraulic functions fade after warm-up
Check pilot pressure at the pump; spec is 40 kg/cm2 (569 psi) on page 322. Low pilot pressure makes every function feel lazy. Then verify main relief at 350 kg/cm2 normal. Replace the 10 micron return line filter and change hydraulic oil at 1,000 hours before condemning the main pump.
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 322Hydraulic pump whining loudly with jerky boom operation and pressure loss under heavy load
Check hydraulic oil level first; the reservoir holds 150 liters. Inspect the 177 micron intake strainer on page 314 for clogging that starves the pump and causes cavitation. Tighten suction line fittings to stop air ingress, bleed the system, and replace the 10 micron return filter if contaminated.
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 314Hydraulic oil overheating and all functions get weak after thirty minutes of hard digging
Clean the oil cooler fins and dust net with compressed air; a plugged cooler is the usual cause. Normal hydraulic system operating temperature is 50°C (122°F) per page 314. Verify oil level in the 150 liter reservoir, and if oil smells burnt, drain and refill; change interval is 1,000 hours.
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 314Swing feels weak and drifts on slopes, upper structure creeps when parked
Test swing relief valve pressure with both swing locks engaged; it must fall between 265 and 275 kg/cm2 (3,769 to 3,911 psi) per page 338. Check swing brake release pressure at 13 kg/cm2. If pressures test good but swing still drifts, inspect the swing motor brake for worn discs.
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 338Travel speed stuck in low, machine won't shift to second speed on flat ground
Check the travel speed solenoid and pressure sensors described on page 823. Second speed engages only when pump discharge pressure drops below 160 kg/cm2 (2,280 psi); above 300 kg/cm2 the system holds low speed. Verify the engine speed dial is set above 1,400 rpm, then test the solenoid valve for sticking.
Manual Section: Electrical System p. 823Battery goes dead overnight and engine cranks slowly even after a full day running
Test each 12 volt battery; rated capacity is 150AH, so load test both before blaming the alternator. Clean and tighten terminals, then check alternator belt tension. With the engine running, measure charging voltage at the battery posts and trace any shorts using the wiring diagram on page 721.
Manual Section: Electrical System p. 721Frequently Asked Questions
How do I reset the operation hour for a filter or oil replacement?
To reset the operation hour, turn the jog switch to locate the cursor on the desired item, then click the jog switch to display the selection screen. Select 'clear' at the right bottom, then click the jog switch again to display the operation hour reset screen. Finally, turn the jog switch to 'YES' and click to confirm the reset. p. 744
What is the procedure for clearing error codes using the self-diagnosis function?
To start self-diagnosis, set the temperature to 25°C or 77°F, then press the SEL switch more than 3 times within 5 seconds while pressing the A/C switch. The system will display error codes, and for normal conditions, 'E0' will light up. To exit, press the SEL switch more than 3 times in 5 seconds while pressing the A/C switch again. p. 844
What is the tightening torque for the main unit mounting bolts on the travel device?
The tightening torque for the main unit mounting bolts on the travel device is 252 ±39.2 Nm (25.7 ±4.0 kg•m). p. 822
What is the required oil volume for the travel motor casing?
The required oil volume for the travel motor casing is 1.0 liters. p. 829
What is the standard torque for the M10 bolts on the travel control valve?
The standard tightening torque for M10 bolts on the travel control valve is 440 kg•cm (32 ft lb). p. 822
Is this Doosan DX140LC-3 manual a download or a disc?
You get a 900-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Am I free to print this Doosan DX140LC-3 Shop Manual?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
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