Part of the Doosan Repair Manuals.
Factory shop manual for the Doosan DX255LC-5 crawler excavator, publication 950106-01505E, 1st Edition August 2014. This is the Tier 4 Final machine with the DL 06P engine, rated 141 kW (190 HP) @ 1,900 rpm (SAE J1995), and this book is written for the wrench, not the operator. You get full teardown coverage of the main pump and its drive coupling, main control valve, swing device, joystick and travel pilot valves, solenoid and EPPR valves, swing bearing, cabin/ROPS, and both the one-piece and two-piece boom. Specification tables, parts lists, section views, and theory of operation run through every chapter, and the back of the book carries oversize foldouts: the hydraulic schematic on page 1315 and the electrical schematic on page 1316.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-74 | Track Excavator Maintenance Safety, Safety Messages, Safe Operation Is Operator's Responsibility, Know Your Machine, Proper Work Tools and Attachments, Pressurized Fluids |
| Specifications | 75-108 | General Description, Component Locations, Overall Dimensions, One - Piece Boom, Two - Piece Boom |
| General Maintenance | 109-146 | General Maintenance Instructions, Welding Precautions and Instructions, Hydraulic System - General Precautions, Maintenance Service and Repair Procedure, General Precautions, Hydraulic System Cleanliness and Oil Leaks |
| Engine | 147-344 | Overview, General Information, General Description, Engine Maintenance, Inspection and Repair of the Engine |
| Upper Structure - Cabin | 345-372 | Cabin, Cabin Identification, Roll-Over Protective Structure (ROPS), Removal, Installation, Dimensions of Cabin Glass |
| Upper Structure - Counterweight and Hydraulic Oil Tank | 373-400 | Counterweight, Warning for Counterweight and Front Attachment Removal, Removal, Installation, Hydraulic Oil Tank, Specification |
| Upper Structure - Fuel Tank | 401-416 | Fuel Tank, Specification, Parts List, Removal, Installation, Completing Work |
| Upper Structure - Main Pump | 417-480 | Main Pump, Axial Piston Pump, Specifications, Overview, Hydraulic Circuit, Parts List |
| Upper Structure - Drive Coupling (Main Pump) | 481-492 | Drive Coupling (Main Pump), Specification, Parts List, Section View, Tools, Disassembly |
| Upper Structure - Main Control Valve | 493-586 | Main Control Valve, Specification, Overview, Parts List, Theory of Operation, Cautions for Operation |
| Upper Structure - Swing Device | 587-648 | Swing Device, Specification, Overview, Parts List, Theory of Operation, Cautions for Operation |
| Upper Structure - Gear Pump (Rotation) | 649-662 | Gear Pump (Rotation), Specification, Overview, Location, Parts List, Single Gear Pump |
| Upper Structure - Joystick Valve (Work Lever) | 663-692 | Joystick Valve (Work Lever), Specifications, Overview, Parts List, Theory of Operation, Tools and Torques |
| Upper Structure - Travel Control Valve (with Damper) | 693-720 | Travel Control Valve (with Damper), Specification, Overview, Parts List, Theory of Operation, Tools and Torques |
| Upper Structure - Solenoid Valve | 721-732 | Solenoid Valve, Specification, Overview, Parts List, Theory of Operation, Disassembly and Reassembly |
| Upper Structure - EPPR Valve and Accumulator | 733-748 | EPPR Valve, Specification, Overview, Hydraulic Circuit, Troubleshooting, Accumulator |
| Lower Structure and Chassis | 749-884 | Swing Bearing, General Description, Parts List, Maintenance Guidelines, Disassembly, Reassembly |
| Front | 885-946 | Boom and Arm, Specifications, One - Piece Boom, Two - Piece Boom, Removal, Arm Removal |
| Hydraulic System | 947-1028 | General Description, Hydraulic Schematic, Hydraulic Component and Oil Flow, Hydraulic Components, Main Oil Circuit |
| Electrical System | 1029-1218 | Electrical Supply System, Engine Starting Circuit, Start Operation, After Start, Engine Preheating System |
| Options | 1219-1310 | One Way, General Description, Theory of Operation, Hydraulic Circuit, Caution for Installation, Installation Procedure |
| Schematic | 1311-1316 | Hydraulic Schematic / Electrical Schematic, Hydraulic Schematic, Electrical Schematic |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine model | Doosan DL 06P, US EPA Tier 4 Final (EU Stage IV) | p. 166 |
| Rated net power | 141 kW (190 HP) @ 1,900 rpm (SAE J1995) | p. 166 |
| Main relief pressure | high 370 kg/cm² (363 bar, 5,263 psi) at 136 L/min; low 350 kg/cm² | p. 497 |
| Main pump rated flow | 250 L/min (50 L/min in neutral) | p. 497 |
| Tail swing radius | 3,040 mm (9' 12") | p. 86 |
| Counterweight clearance | 1,110 mm (3' 8") | p. 86 |
| Track length | 4,630 mm (15' 2") | p. 86 |
| Undercarriage width, standard | 3,200 mm (10' 6") | p. 86 |
| Undercarriage width, narrow | 3,000 mm (9' 10") | p. 86 |
| Shoe width | 600 mm (2' 0") | p. 86 |
| Shipping length | 10,080 mm (33' 1") | p. 86 |
| Height over cabin | 2,995 mm (9' 10") | p. 86 |
