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.
What's Inside This Doosan DX340LC 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 |
Doosan DX340LC Common Problems This Manual Covers
Doosan DX340LC travel motor won't rotate, one track dead, metal particles in drain oil
Check the drain oil for metallic particles first; flakes point to internal motor damage, not the brake. Verify system pressure reaches the 330 kg/cm2 (4,694 psi) working pressure listed on page 411. If the brake releases but the track still won't turn, tear the motor down and measure piston to bore clearance; anything over 0.52 mm, spec on page 428, means replace the rotary group.
Manual Section: Travel Motor Troubleshooting p. 391Swing won't rotate or jerks during rotation, grinding noise from the reduction gearbox
Drain the swing reduction gearbox oil and inspect it for metal flakes; flakes mean worn gears or bearings, not a hydraulic fault. Refill to the level plug and never run it low, heat kills these boxes fast. If rotation stays weak, confirm the drive still delivers its rated 2,100 kg•m (15,189 ft lb) output torque, spec on page 184.
Manual Section: Swing Reduction Gear Troubleshooting p. 184All hydraulic functions slow and weak, pump whines under load once oil warms up
Test main relief pressure before touching the pump: 330 kg/cm2 normal, 350 kg/cm2 in pressure-up mode, spec on page 72, using the procedure starting on page 269. Check the reservoir level; the tank holds 206 liters. A whining pump is usually cavitation, so inspect the suction line and fittings for air leaks and tighten or reseal them.
Manual Section: Hydraulic System Troubleshooting p. 269Hydraulic oil overheating and return filter clogged warning after a few hours of digging
Replace the return filter element; the warning trips once restriction passes 1.50 kg/cm2 (21 psi), spec on page 702. Swap the pilot filter while you're in there, it flags at 1 kg/cm2 (14 psi) per page 703. Then blow out the oil cooler fins and check fan belt tension; a slipping belt cooks hydraulic oil fast.
Manual Section: Electrical System Troubleshooting p. 702Black smoke and power loss uphill, air cleaner clogged warning keeps coming back
Remove the air cleaner element and replace it instead of blowing it out if the pleats look oily or torn. Reinstall with the worm drive clamp torqued to 0.2 - 0.3 kg•m (20 - 30 in lb) for clamps under 44 mm, spec on page 110. A loose or overtightened clamp leaks dust straight into the turbo.
Manual Section: General Maintenance p. 110Frequently Asked Questions
What is the procedure to clear the failure log on the Doosan DX340LC?
To delete the failure log, enter the special menu and select 'Delete Fail Log'. When the 'YES' button is pressed, the system will prompt for a password. Input the password using the switches 1-8. If the password is correct, the log will be deleted and a 'DELETED !!!' message will appear for 3 seconds. p. 727
What is the fuel tank capacity for the DX340LC?
The fuel tank capacity for the DX340LC is 550 liters (145 U.S. gal). p. 147
What is the tightening torque for the main relief valve on the DX340LC?
The tightening torque for the main relief valve is 7.95 - 8.97 kg•m (58 - 65 ft lb). p. 581
What is the recommended oil volume for the swing reduction gear?
The swing reduction gear requires 5 liters of gear oil for the initial fill, and an additional 2.5 liters after the noise test, for a total of 7.5 liters. p. 218
What is the tightening torque for the counterweight mounting bolts on the DX340LC?
The counterweight mounting bolts for the DX340LC should be tightened to 250 kg•m (1,807 ft lb). p. 139
What format is this Doosan DX340LC manual in?
A single searchable PDF file of 832 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Am I free to print this Doosan DX340LC Shop Manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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