Part of the Doosan Repair Manuals.
Chasing a Doosan DX255LC shop manual PDF that actually covers your machine? This 826-page factory shop manual (OEM #K1016585E) is titled for the DX255LC on its cover, and its shared service sections list the wider Doosan track excavator family: DX180LC, 225LC, 225NLC, 255LC, 300L, 340LC, 420LC, 480LC, and 520LC. Inside you get complete electrical schematics, full hydraulic schematics, and a hydraulic troubleshooting, testing, and adjustment section that walks you through pressure checks the way factory techs run them. Rebuild procedures cover the swing motor, travel motor, main control valve, axial piston pump, cylinders, and center joint, backed by standard torque tables. Set main relief at 330 kg/cm2 (350 in pressure-up mode) and fill the hydraulic system to 240 liters, straight from the spec pages. Forum threads won't rebuild your travel motor. Download the bookmarked PDF, search any spec by keyword, and get wrenching. Note that the Specifications section is written for the DX255LC — the shared removal, disassembly and troubleshooting sections carry the wider model list.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-52 | Track Excavator Safety |
| Specifications | 53-80 | Specification for DX255LC |
| General Maintenance | 81-118 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 119-222 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 223-256 | Track Assembly |
| Engine and Drive Train | 257-268 | Drive Coupling (Main Pump) |
| Hydraulic System Troubleshooting, Testing and Adjustment | 271-304 | Safety Precautions, Applicable Models, Hydraulic System - General Notes, Hydraulic Schematic, Operation of Working Components, Boom Operating Circuit |
| Accumulator | 305-352 | Safety Precautions, Applicable Models, General Description |
| Swing Motor | 353-390 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Makeup Check Valve, Operation of Time Delay Valve |
| Travel Motor | 391-450 | Safety Precautions, Applicable Models, Operation Manual, General Specifications, Basic Structure and Diagram, Operation Principles |
| Gear Pump | 451-530 | Safety Precautions, Applicable Models, Single Gear Pump, Disassembly, Reassembly |
| Axial Piston Pump | 531-576 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Torques |
| PTO Server | 577-610 | Safety Precautions, Applicable Models, Pump Maintenance, Disassembly, Reassembly, Maintenance Standards of Pump Body |
| Travel Control Valve (with Damper) | 611-668 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Deceleration Valve, Dampening Parts of the Control Section |
| Electrical System | 669-802 | Electrical Schematic (DX180LC/DX225LC/ DX225NLC/DX255LC) |
| Attachments | 803-826 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel Tank Capacity | 410 liters | p. 68 |
| Hydraulic System Capacity | 240 liters | p. 68 |
| Hydraulic Reservoir Capacity | 150 liters | p. 68 |
| Main Relief Pressure (Normal) | 330 kg/cm2 | p. 74 |
| Main Relief Pressure (Pressure Up) | 350 kg/cm2 | p. 74 |
| Engine Power | 175 ps @ 1,900 rpm | p. 71 |
| Max Torque | 78 kg•m @ 1,400 rpm | p. 71 |
| Refrigerant R134a Weight | 800 ± 20 grams | p. 778 |
