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 Doosan DX350LC 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 |
Doosan DX350LC Common Problems This Manual Covers
Doosan DX350LC hydraulic functions slow when oil warms up, pump whines under load, boom speed drops
Test main relief pressure against the 350 kg/cm2 spec on page 72 before condemning the pump. Work through the hydraulic troubleshooting procedures starting to isolate internal leakage. Replace the 10 micron return line filter and cut it open; bronze or steel debris in the element points to pump wear.
Manual Section: Hydraulic System TroubleshootingOne track slower than the other, machine pulls to one side, travel jerky under load
Swap the travel lines at the motor to confirm whether the fault follows the motor or stays with the pump side, then follow the travel deviation checks starting. Drain the travel reduction gear and refill with 5.5 liters of gear oil per page 409; metal flakes in the old oil mean worn gears.
Manual Section: Travel Motor Troubleshooting p. 409Engine cranks slowly or just clicks, no start after sitting overnight in cold weather
Load test the 100AH battery listed on page 684 before throwing parts at it; a battery that sags hard under load is done. Clean and tighten the ground straps at the frame and engine block, then check the starter cable ends for corrosion. Run the electrical self-diagnosis procedures beginning on page 672 if the crank circuit still acts up.
Manual Section: Electrical System Troubleshooting p. 684Track rollers leaking oil, tracks squealing, shoe wear uneven from side to side
Measure lower roller tread diameter and replace any roller worn below 164 mm (6.457 in) per the wear limits on page 240. Check front idler tread against the 568 mm replacement limit on page 242. Reset track sag to spec and clean packed mud out of the undercarriage daily; overtight tracks eat rollers and idlers fast.
Manual Section: Lower Structure and Chassis p. 240Grinding noise from the swing drive, house hesitates then jerks when rotation starts
Check swing system pressures and brake release using the procedures starting. Replace the 10 micron pilot circuit filter listed on page 278; a plugged pilot filter delays brake release and makes the swing start with a bang. Drain the swing reduction gear and inspect the oil for metal before the bearing lets go.
Manual Section: Hydraulic System TroubleshootingFrequently Asked Questions
How do I reset the service interval for filters and oils on a Doosan DX350LC?
To reset the operating hours for filters and oils, navigate to the 'Filter/Oil Info' mode in the main menu. After changing the filter and oil, you can reset the operating hour so that the hours until the next service interval can be easily checked. p. 708
What is the tightening torque for the mounting nuts on the cabin floor of a Doosan DX350LC?
The mounting nut torque for the cabin floor is 21 kg•m (205 N•m, 150 lbf ft). p. 128
What is the correct tightening torque for the main relief valve on the Doosan DX350LC main control valve?
The tightening torque for the main relief valve is 7.95 - 8.97 kg•m (58 - 65 ft lb). p. 581
What is the fuel tank capacity for the Doosan DX350LC?
The fuel tank capacity for the DX350LC is 550 liters (145 U.S. gal). p. 147
How do I check for air leakage in the reduction gear of the travel motor?
Remove one plug (032) from the reduction gear section and apply compressed air (0.3 kgf/cm²) through the threaded hole for 2 minutes under water. No air bubbles should be generated. p. 447
Will this Doosan DX300–DX520 Series Shop Manual download right away?
Straight to your device: 828 pages of searchable Shop Manual, downloadable the moment payment goes through.
Can I print this Doosan DX300–DX520 Series manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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