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 Doosan DX180–DX520 Series 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 |
Doosan DX180–DX520 Series Common Problems This Manual Covers
Doosan DX255LC hydraulics slow and weak, boom and bucket lack digging power under load
Check main relief pressure first using the test procedures that start. Normal relief setting on the DX255LC is 330 kg/cm2, with pressure-up at 350 kg/cm2. If readings fall short, adjust the relief valve, then recheck. Low pressure across all circuits usually points to pump wear or a clogged suction line.
Manual Section: Hydraulic System TroubleshootingHydraulic oil overheats and main pump whines after an hour of steady digging
Check the reservoir oil level before anything else; the DX255LC reservoir holds 150 liters, and low oil pulls air into the pump, which produces both the whine and the heat. Inspect the oil cooler for packed debris, then work through the oil temperature checks in the troubleshooting procedures beginning.
Manual Section: Hydraulic Problems TroubleshootingEngine cranks slowly or will not start after the machine sits overnight
Test battery voltage and load first, then clean and tighten every ground strap; corroded grounds cause most intermittent no-starts on these machines. Trace the start circuit against the wiring diagram. Check the DEF pump and DEF sending unit too, both common failures. Confirm fuel supply; the DX255LC tank holds 340 liters.
Manual Section: Electrical SystemMachine pulls to one side when traveling and travel motors grind at full speed
Test travel deviation by swapping the motor supply lines side to side; if the pull follows the swap, the problem is in the pump or control valve, not the motor. Run the travel deviation checks starting, comparing both circuits against the DX255LC relief setting of 330 kg/cm2. Check for packed mud binding one track.
Manual Section: Travel Motor TroubleshootingAir conditioner blows warm and compressor cycles on and off during hot afternoons
Check refrigerant pressure on both sides with a gauge set before condemning the compressor. Short cycling usually means low charge. Recover the system, pull a vacuum, and recharge with R134a to 800 ± 20 grams on the DX255LC, the factory weight listed on page 778. Clean debris out of the condenser fins while the system is empty.
Manual Section: Refrigerant System Troubleshooting p. 778Frequently Asked Questions
How do you reset the operating hours for filters and oils on the Doosan DX255LC?
To reset the operating hours for filters and oils, navigate to the 'Filter/Oil Info' mode in the main menu. Once the filter or oil has been changed, use the 'RESET' function on the display to reset the operating hour counter, allowing you to easily track the time until the next service interval. p. 705
How do you delete past failure records from the e-EPOS controller?
To delete past failure records, navigate to the 'Special Menu' and select 'Failure Info'. Within this menu, select 'Delete Fail Log'. You will be prompted to enter a password; once the correct password is entered, select 'YES' to delete all memorized records. The screen will display a confirmation for 3 seconds. p. 713
What is the fuel tank capacity for the DX255LC?
The fuel tank capacity is 340 liters (90 U.S. gal) as stated in the specific Fuel Tank section (page 151), noting that the 410-liter figure on page 68 may be an error or refer to a different configuration. p. 151
What is the tightening torque for the main relief valve on the DX255LC?
The tightening torque for the main relief valve is 7.95 - 8.97 kg•m (58 - 65 ft lb). p. 527
What is the recommended gear oil quantity for the travel motor reducer?
The recommended quantity of lubricating oil for the travel motor reducer is 3.3 liters. p. 407
Do I get instant access to this Doosan DX180–DX520 Series Shop Manual?
All 826 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Are there any print restrictions on this Doosan DX180–DX520 Series manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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