Part of the Doosan Repair Manuals.
Got a Doosan DX300LC or DX340LC in the shop? All 840 pages of this shop manual PDF (OEM #K1009684E) cover both excavators, from swing reduction gear to bucket pins. Inside: a full hydraulic troubleshooting, testing, and adjustment section, factory hydraulic schematics, and complete electrical schematics for both machines. You also get teardown and rebuild procedures for the main pump, swing motor, travel motor, cylinders, main control valve, and track assembly, backed by standard torque tables. Set track tension to 330-360 mm (13.0-14.17 in) on normal terrain, then torque the relief valve to 1700-1900 kg-cm (123-137 ft lb) with cracking pressure at 270 kg/cm³ (3,840 psi). Your excavator isn't earning anything parked. Bookmarked with a full text layer: type a spec, jump straight to the page, and get back in the seat.
What's Inside This Doosan DX340LC, DX300LC Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-52 | Safety Precautions, Applicable Models, To the Operator of a Doosan Daewoo Excavator, General Safety Essentials, Location of Safety Labels |
| Specifications | 53-80 | Specification for DX340LC |
| General Maintenance | 81-118 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 119-216 | Swing Reduction Gear, Swing Bearing, Fuel Tank, Counterweight, Cabin |
| Lower Structure and Chassis | 217-288 | Air Conditioner SP000025, Track Assembly |
| Engine and Drive Train | 289-298 | Drive Coupling (Main Pump) |
| Hydraulic System Troubleshooting, Testing and Adjustment | 301-336 | Safety Precautions, Applicable Models, Hydraulic System - General Notes, Hydraulic Schematic, Operation of Working Components, Boom Operating Circuit |
| Accumulator | 337-388 | Safety Precautions, Applicable Models, General Description |
| Swing Motor | 389-424 | Safety Precautions, Applicable Models, General Description, Torques, Theory of Operation, Makeup Check Valve |
| Travel Motor SP000253 | 425-484 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Special Tools and Materials, Hydraulic Motor Part |
| Main Pump | 485-534 | Safety Precautions, Applicable Models, A8VO200LA1KH1/63, General Repair Guidelines, Seal Kits and Sub-Assemblies, Sealing the Drive Shaft |
| Gear Pump | 535-614 | Safety Precautions, Applicable Models, Disassembling Single Gear Pump (Opt), Reassembling Single Gear Pump (Opt) |
| Remote Control Valve (Work Lever / Joystick) | 615-662 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Torques, Tools and Materials |
| Breaker EPPR Valve (Opt) | 663-684 | Safety Precautions, Applicable Models, Structure, Numbers and Names of Parts, Functions and Operation, Cautions for Operation |
| Electrical System | 685-810 | Electrical System SP000038, Electrical Schematic (DX300LC/340LC) |
| Attachments | 811-840 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track tension distance for Normal terrain | 330 - 360 mm (13.0 - 14.17 in) | p. 225 |
| Track tension distance for Minimum clearance | 330 mm (13.0 in) | p. 225 |
| Relief Valve Torque | 1700 - 1900 kg•cm (123 - 137 ft lb) | p. 396 |
| Set Pressure of Relief V/V (Cracking) | 270 kg/cm2 (3,840 psi) | p. 396 |
| Motor Displacement | 250 cc/rev (15.26 in3/rev) | p. 396 |
| Motor Output Torque | 107.4 kg•m (777 ft lb) | p. 396 |
| Gear oil | 5.5 l/min. | p. 443 |
| Tightening torque for plug (564) | 220kgf•cm | p. 466 |
| Clearance (D-d) between piston and cylinder bore | 0.52 mm | p. 462 |
| Clearance between piston and shoe | 0.1 mm | p. 462 |
| Radial clearance of needle cage | 0.01 ~ 0.04 mm | p. 464 |
| Main relief valve plug (8) torque | below 2.0 kg•m (15 ft lb) | p. 591 |
Doosan DX340LC, DX300LC Common Problems This Manual Covers
Doosan DX340LC hydraulic system slow and weak, low digging force, boom and bucket struggle under load
Check main relief pressure first; a DX340LC should hold 330 kg/cm³ normal and 350 kg/cm³ in pressure up mode, spec on page 74. If pressure sags, adjust or replace the main relief valve and torque it to 7.95 - 8.97 kg•m (58 - 65 ft lb) per page 611. Sample suction oil for contamination before condemning the pump.
Manual Section: Hydraulic System Troubleshooting p. 74One travel motor barely moves, travel jerky or machine pulls to one side
Check travel motor drain oil for metal flake before teardown; contamination means the rotary group or reduction gear is failing. Confirm working pressure of 330 kg/cm³ at the motor, page 443. During rebuild, replace the rotary group if piston to bore clearance exceeds 0.52 mm (page 462), then torque the socket bolts to 4400 kgf•cm per page 471.
Manual Section: Travel Motor Troubleshooting p. 443Swing motor grinding noise, upper structure coasts past target or drifts on slopes
Drain gear oil from the swing reduction and check for metal particles. Test the motor relief valve against its 270 kg/cm³ (3,840 psi) cracking pressure on page 396; replace a weak valve and torque it to 1700 - 1900 kg•cm (123 - 137 ft lb). Verify the parking brake releases fully before condemning the motor itself.
Manual Section: Swing Motor Troubleshooting p. 396Tracks keep coming loose and throwing off on slopes, or run tight and squeal
Measure track sag between the carrier roller and the grousers. Adjust the tensioner until sag reads 330 - 360 mm (13.0 - 14.17 in) for normal terrain per page 225; run 360 - 410 mm in mud and 410 mm on gravel, rock, sand or snow. Inspect the idler and adjuster seal for grease leaks while you are in there.
Manual Section: Lower Structure and Chassis p. 225Air conditioner blows warm air and compressor short cycles during hot weather operation
Verify compressor clutch engagement and belt condition first. Connect manifold gauges and compare high and low side readings; erratic pressure usually means low charge or air in the system. Recover, evacuate, and recharge by weight: the DX340LC takes 800 grams of R134a, listed on page 791. Check the DX300LC charge decal before filling that model.
Manual Section: Air Conditioner Troubleshooting p. 791Frequently Asked Questions
What is the track tension adjustment procedure for a DX340LC?
To check track tension, jack up one side of the excavator and place blocking under the frame. Measure the distance (A) between the bottom of the side frame and the top of the lowest crawler shoe. For normal terrain, the distance should be 330 - 360 mm (13.0 - 14.17 in). Adjust tension using the grease fitting in the middle of each side frame. p. 85
What is the hydraulic pressure setting for a Doosan DX340LC?
The main relief pressure for the DX340LC is 330 kg/cm³ (4,689 psi) for normal operation. When the "Pressure Up" function is engaged, the pressure increases to 350 kg/cm³ (4,970 psi). p. 74
What are the replacement specifications for the Main relief valve assembly?
The main relief valve should be replaced as an assembly. When installing, tighten the plug (1, width across flats: 32 mm) to a torque of 7.95 - 8.97 kg•m (58 - 65 ft lb). p. 611
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 counterweight mounting bolts on a DX340LC?
The mounting bolts for the counterweight on a DX340LC must be torqued to 250 kg•m (1,807 ft lb). p. 140
Is this Doosan DX300LC manual a download or a disc?
Delivery is instant: a 840-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this Doosan DX300LC Shop Manual printable?
Print away. There is no DRM and no page limit. Many buyers print one chapter at a time and leave the rest on a tablet.
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