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 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 |
