Part of the Doosan Repair Manuals.
Wrenching on a Doosan DX340LC? This 832-page Doosan DX340LC Shop Manual PDF (OEM #K1009684AE) walks you through the whole track excavator, and the same factory procedures cover the DX300LC, DX350LC, DX420LC, and DX480LC. Open to the hydraulic troubleshooting section and you get main relief pressure tests, actuator speed checks, travel and swing speed tests, and cylinder performance standards. Factory hydraulic schematics, the complete electrical schematic, and page after page of standard torque tables back up teardown steps for the swing motor, travel motor, main pump, and main control valve. Check maximum output torque at 2,100 kg•m (15,189 ft lb), and snug small worm-drive air cleaner clamps to 0.2-0.3 kg•m. No more chasing hydraulic drift with forum guesses. Bookmarked with a full text layer: search any spec, jump to any section, get back on the sticks.
Other edition of this manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-50 | Track Excavator Safety |
| Specifications | 51-78 | Specification for DX340LC |
| General Maintenance | 79-116 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 117-226 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump (Opt), Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 227-258 | Track Assembly |
| Engine and Drive Train | 259-268 | Drive Coupling (Main Pump) |
| Hydraulic System Troubleshooting, Testing and Adjustment | 269-302 | Main Relief Pressure, Actuator Speeds, Excavator Performance Standards, Travel Speed Tests, Swing Speed Tests, Cylinder Performance Tests |
| Accumulator | 303-310 | Accumulator Maintenance, Precharge Pressure, Gas-Charged Storage, Hydraulic Circuit Pressure |
| Center Joint (Swivel) | 311-324 | Center Joint Disassembly, Center Joint Assembly, Hydraulic Oil Flow, 360 Degree Rotation |
| Cylinders | 325-354 | Cylinder Disassembly, Cylinder Reassembly, Piston Nut, Slipper Seal, Rod Bushing |
| Swing Motor | 355-390 | Swing Motor Disassembly, Swing Motor Reassembly, Relief Valve, Parking Brake, Time Delay Valve |
| Travel Motor | 391-450 | Travel Motor Disassembly, Travel Motor Reassembly, Reduction Gear, Counterbalance Valve, Tilting Part |
| Main Pump | 451-508 | Main Pump Disassembly, Main Pump Reassembly, Rotary Group, Control Housing, Gear Pump Sealing |
| Main Control Valve | 521-673 | Main Control Valve Disassembly, Main Control Valve Reassembly, Relief Valve, Antidrift Valve, Spool Shift |
| Electrical System | 674-802 | Electrical Schematic DX300/340/350LC |
| Attachments | 803-832 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Max. Torque | 117 kg•m (846 ft lb) | p. 69 |
| Worm Drive - Under 44 mm (1-3/4 in) Open Diameter torque for air cleaner | 0.2 - 0.3 kg•m (20 - 30 in lb) | p. 110 |
| Worm Drive - Over 44 mm (1-3/4 in) Open Diameter torque for air cleaner | 0.5 - 0.6 kg•m (40 - 50 in lb) | p. 110 |
| Maximum Output Torque (DX340LC / DX350LC) | 2,100 kg•m (15,189 ft lb) | p. 184 |
| Maximum Output Torque (DX420LC) | 2,360 kg•m (17,070 ft lb) | p. 184 |
| Weight | 275 kg (606 lb) | p. 184 |
| Working pressure | 330 kg/cm2 (4,694 psi) | p. 411 |
| Working flow | 280 l/min. (74 U.S. gal.) | p. 411 |
| Dimension (D) | 0.4 ±0.1 mm | p. 494 |
| M6 tightening torque | 8.5 Nm | p. 499 |
| Main relief valve plug (8) torque | 2.0 kg•m (15 ft lb) | p. 565 |
| Overload relief valve lock nut (3) torque | 2.8 - 3.2 kg•m (20 - 23 ft lb) | p. 566 |
