Part of the Doosan Repair Manuals.
Wrenching on a Doosan DX track excavator? This 804-page Doosan DX225NLC shop manual PDF (OEM #K1024241E) is titled for the DX225NLC on its cover, and its shared service sections list the wider family: 180LC, 225LC, 225NLC, 255LC, 300L, 340LC, 420LC, 480LC, and 520LC. Open to full electrical schematics with machine wiring, hydraulic schematics, and a fat hydraulic troubleshooting, testing, and adjustment section that walks you through pressure checks on the axial piston pump, swing motor, travel motor, and main control valve. You also get standard torque tables, swing bearing and reduction gear teardowns, cylinder rebuilds, and complete track assembly service. Torque the DX225NLC counterweight bolts to 150 kg-m (1,085 ft lb), and press track pins to a 0.3 to 0.422 mm link interference. No more chasing a pressure fault with a gauge and a hunch. Bookmarked with a live text layer: type the spec, jump to the chapter, fix the machine. Note that the Specifications section is written for the DX225NLC — 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 | 53-82 | Specification for DX225NLC |
| General Maintenance | 83-120 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 121-224 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 225-260 | Track Assembly |
| Engine and Drive Train | 261-272 | Drive Coupling (Main Pump) |
| Hydraulic System Troubleshooting, Testing and Adjustment | 275-312 | Safety Precautions, Applicable Models, Hydraulic System - General Notes, Hydraulic Schematic, Operation of Working Components, Boom Operating Circuit |
| Accumulator | 313-360 | Safety Precautions, Applicable Models, General Description |
| Swing Motor | 361-392 | Safety Precautions, Applicable Models, Structure and Operational Principles, Cautions, Maintenance Instructions, Disassembly and Assembly |
| Travel Motor | 393-452 | Safety Precautions, Applicable Models, Operation Manual, General Specifications, Basic Structure and Diagram, Operation Principles |
| Gear Pump | 453-532 | Safety Precautions, Applicable Models, Single Gear Pump, Disassembly, Reassembly |
| Axial Piston Pump | 533-584 | Safety Precautions, Applicable Models, Pump Maintenance, Component Locations, Tools, Tightening Torque |
| Travel Control Valve (with Damper) | 585-610 | Safety Precautions, Applicable Models, General Description, Theory of Operation, Deceleration Valve, Dampening Parts of the Control Section |
| Solenoid Valve Assembly | 611-644 | Safety Precautions, Applicable Models, Package, Functions of Solenoid Valve Assembly Package, Assembly Diagram and Tools Required, Solenoid Valve Diagram |
| Electrical System | 645-780 | Electrical Schematic (DX180LC/DX225LC/ DX225NLC/DX255LC) |
| Attachments | 781-804 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cooling Fan | 660.4mm (26 in) | p. 72 |
| Bolt Torque | 150 kg•m (1,085 ft lb) | p. 146 |
| Interference between Regular Pin and Link (Standard Interference) | 0.3 - 0.422 mm | p. 240 |
| Clearance between Regular Pin and Bushing (Standard Interference) | 0.18 - 0.74 mm | p. 240 |
| Nominal Output Torque | max. 4000 kgf•m | p. 398 |
| Hydraulic Motor Max. Stroke Capacity | 183.9 cc/rev | p. 398 |
| Recommended quantity of oil for the case | 1.2 liter | p. 407 |
| Hydraulic oil change interval | 1000 hours or 1 year | p. 408 |
| Nominal sectional area of wire core less insulator | 0.85 mm2 | p. 655 |
| Boom Foot Pin Clearance Limit | 1.5 mm | p. 789 |
| Boom Cylinder Head Pin Clearance Limit | 1.5 mm | p. 789 |
| Fuel Tank Capacity | 340 liters | p. 70 |
