Part of the Doosan Repair Manuals.
Every one of the 842 pages in this Doosan DX55 Service Manual PDF (OEM #K1038080E) is aimed at one machine: the DX55 track excavator, from swing bearing to bucket teeth. You get factory hydraulic schematics covering the main pump, control valve, and travel circuits, plus complete wiring diagrams for the starting, preheating, and instrument systems. Inside this shop manual: a full standard torque section for metric and U.S. fasteners, engine work from cylinder head to alternator, and rebuild steps for the swing motor, travel motor, and cylinders. Measure your track links first: 135 mm pitch is standard, 137 mm means replacement time. Then torque the fuel filter to 19.6-23.5 N-m and move on. No more chasing hydraulic problems with borrowed numbers. Bookmarked and keyword-searchable on any device; download it and walk straight to the machine.
What's Inside This Doosan DX55 Manual
| System | Pages | Key Topics |
|---|---|---|
| Track Excavator Safety | 5-48 | Safety Precautions, General Safety Essentials, Location of Safety Labels, Machine Operation, Maintenance, Battery, Towing, Shipping and Transportation |
| Specification for DX55 | 49-72 | Component Locations, General Dimensions, Working Range, General Specifications, Engine Performance Curves, Performance Tests, Excavator Performance Standards |
| General Maintenance Procedures | 73-92 | Welding Precautions, Hydraulic System, Maintenance Service and Repair Procedure, Hydraulic System Cleanliness, Oil Leakage Precautions, Cleaning and Inspection, Bearing Inspection |
| Standard Torques | 93-108 | Metric Fasteners, U.S. Fasteners, Type 8 Phosphate Coated Hardware, Hose Clamps, Split Flanges, Torque Wrench Extension Tools |
| Cabin | 109-118 | Cabin Shell Removal and Installation, Main and Stand Wiring Harness Disconnection, Air Conditioner Box Harness, Control Console Harnesses and Hydraulic Lines, Cabin Weight 290 Kg (639 Lb) Lifting Precaution |
| Swing Bearing | 119-126 | Operating Recommendation, Axial Play, Lateral Play, Basic Operation, Rebuilding |
| Track Assembly | 127-160 | Track Tension, Cleaning and Inspection, Idler, Lower Roller, Upper Roller, Sprocket, Track Removal and Installation |
| Engine | 161-422 | General Service Information, Periodic Maintenance, Cylinder Head, Fuel System, Cooling System, Lubrication System, Starter Motor, Alternator |
| Drive Coupling (Main Pump) | 423-430 | Safety Precautions, Installation Procedure, Precaution |
| Accumulator | 431-438 | Safety Precautions, General Description, Specifications |
| Center Joint (Swivel) | 439-448 | Safety Precautions, General Description, Troubleshooting, Testing, Adjustment, Disassembly, Assembly |
| Cylinders | 449-476 | Safety Precautions, Theory of Operation, Special Tools, Materials, Disassembly, Assembly |
| Swing Motor | 477-526 | Safety Precautions, Description of Functions, Operation, Precautions for Handling, Periodic Inspection, Troubleshooting, Service Manual |
| Travel Motor | 527-598 | Safety Precautions, General, Operating Principle, Special Tools, Materials, Troubleshooting, Disassembly |
| Main Control Valve | 599-650 | Safety Precautions, Composition, Function, Operation, Disassembly, Cleaning, Inspection, Assembly |
| Main Pump | 651-704 | Safety Precautions, General Description, Operation Principle, Function of Components, Adjustment, Installation, Driving, Hydraulic Oil |
| Remote Control Valve (Work Lever / Joystick) | 705-720 | Structure Diagram, Performance Specification, Hydraulic Pressure Circuit Diagram, Disassembly Method, Assembly Method |
| Dozer Valve | 721-734 | Structure Diagram, Performance Specification, Hydraulic Pressure Circuit Diagram, Disassembly, Assembly Method |
| Pedal Valve | 735-754 | Maintenance, Maintenance Standard, Disassembly, Assembly, Troubleshooting |
| Hydraulic Schematic (DX55) | 755-760 | Safety Precautions, Applicable Models, DX55 Hydraulic Circuit Diagram (Publication SP001492) |
| Electrical System | 761-814 | Electrical Supply System, Engine Starting, Engine Preheating System, Instrument System, Engine Control Dial, Refrigerant Circulation |
| Electrical Schematic (DX55) | 815-820 | Safety Precautions, Applicable Models, DX55 Electrical Circuit Diagram (Publication SP001494) |
| Boom and Arm | 821-832 | Front Attachment Pin Specifications, Front Attachment Removal and Installation, Arm Removal Procedure, Boom Removal Procedure, Arm Installation Procedure |
| Bucket | 833-842 | Bucket Tooth Inspection and Replacement, Bucket O-Ring Replacement, Bucket Attachment Removal and Reversal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Link Pitch Standard | 135 mm (5.32 in) | p. 138 |
| Link Pitch Limit | 137 mm (5.4 in) | p. 138 |
| Fuel filter tightening torque | 14 - 17 ft•lb (19.6 - 23.5 N•m) | p. 232 |
| Fuel filter / water separator retaining ring torque | 11 - 15 ft•lb (15 - 20 N•m) | p. 246 |
| Engine oil drain plug torque | 14 - 17 ft•lb (19.6 - 23.5 N•m) | p. 228 |
| V-belt deflection force | 22 ft•lb (98 N•m) | p. 231 |
| Used V-belt deflection (Position A) | 3/8 - 1/2 in. (10 - 14 mm) | p. 231 |
| Air cleaner element cleaning air pressure | 42 - 71 psi (0.29 - 0.49 MPa) | p. 237 |
| Hydraulic filter replacement interval | 500 hours | p. 668 |
| Engine Coolant Temperature Sensor (50°C) | Over 188.2Ω | p. 779 |
| Engine Coolant Temperature Sensor (67°C) | 102Ω | p. 779 |
| Engine Rated Power | 41.5 Kw (56.4 hp) @ 2,000 rpm | p. 62 |
