Part of the Doosan Repair Manuals.
Need factory answers for your Doosan DX300LC? This 828-page Doosan DX300LC Shop Manual PDF (OEM #K1046036E) covers the full track excavator family: DX300LC, DX340LC, DX350LC, DX420LC, DX480LC, and DX520LC. You get complete electrical schematics for chasing harness faults, hydraulic schematics with full circuit routing, and a heavy troubleshooting, testing, and adjustment section spanning the main pump, swing motor, travel motor, and main control valve. Standard torque tables sit next to teardown procedures for cylinders, the center joint, the swing bearing, and the swing reduction gear. Put a caliper on your lower roller tread: 166 mm means schedule maintenance, 164 mm means replace it. The front idler follows the same logic at 572 and 568 mm. A parked excavator earns nothing. Bookmarked with a full text layer; type the spec, land on the page, get back in the seat.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-50 | Track Excavator Safety |
| Specifications | 51-78 | Specification for DX350LC |
| General Maintenance | 79-116 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 117-226 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump (Opt), Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 227-258 | Track Assembly |
| Engine and Drive Train | 259-268 | Drive Coupling (Main Pump) |
| Hydraulic System Testing and Adjustment | 269-450 | Procedural Troubleshooting Baseline, Center Joint, Travel Motor, Boom, Arm, Bucket and Swing Operating Circuits, Cylinders, Pilot Valve |
| Main Pump | 451-520 | Construction, Disassembly and Assembly, Regulator, Maintenance Standards |
| Main Control Valve | 521-636 | Construction, Spool Shift, Disassembly and Assembly, Relief Valve Settings |
| Solenoid Valve and Hydraulic Components | 637-671 | Assembly Diagram, Required Tools, Assembly Torque |
| Electrical System | 672-798 | Electrical Schematic DX300/340/350LC |
| Attachments | 799-828 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Lower Roller - Outside Diameter of Tread - Recommended Limit for Maintenance | 166 mm (6.535") | p. 240 |
| Lower Roller - Outside Diameter of Tread - Limit for Use (Replace) | 164 mm (6.457") | p. 240 |
| Front Idler - Outside Diameter of Tread - Recommended Limit for Maintenance | 572 mm (22.520") | p. 242 |
| Front Idler - Outside Diameter of Tread - Limit for Use (Replace) | 568 mm (22.362") | p. 242 |
| Hydraulic reservoir return line filter rating | 10 micron | p. 278 |
| Pilot circuit filter rating | 10 micron | p. 278 |
| Battery capacity | 100AH | p. 684 |
| Fuel Tank Capacity | 550 liters | p. 66 |
| Hydraulic System Capacity | 324 liters | p. 66 |
| Hydraulic Reservoir Capacity | 206 liters | p. 66 |
| Main Relief Pressure | 350 kg/cm2 | p. 72 |
| Engine Power | 275 ps | p. 69 |
