Part of the Doosan Repair Manuals.
Looking for a Doosan DX300LCA, DX340LCA shop manual PDF? This 818-page factory shop manual (OEM #950106-00268E) walks both track excavator models through every system, from the swing bearing to the travel motors. You get full hydraulic schematics with troubleshooting baselines, pilot pressure checks, and pump input power adjustments, plus complete electrical schematics for the starting circuit, charging system, and power mode control. Inside: rebuild procedures for the main pump, swing motor, travel motor, and cylinders, right down to the piston jig and steel bushing jig setups. Before startup, fill the fuel tank to 550 liters (145 U.S. gal) and snug the T-bolt hose clamps to 0.68-0.72 kg-m (59-63 in lb). No more bleeding a hydraulic circuit on a hunch. Bookmarked and text-searchable; pull it up on your tablet at the machine and start wrenching.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-50 | Track Excavator Safety |
| Specifications | 51-78 | Specification for DX340LCA |
| General Maintenance | 79-116 | Standard Torques |
| Upper Structure | 117-224 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gear |
| Lower Structure and Chassis | 225-256 | Track Assembly |
| Engine and Drive Train | 257-266 | Drive Coupling |
| Hydraulic System Troubleshooting, Testing and Adjustment | 267-300 | Hydraulic Schematic, Troubleshooting Baseline, Pilot Pressure, Power Mode Valve, Pump Input Power Control |
| Accumulator | 301-308 | Accumulator Operation, Precharge Pressure, Specifications |
| Center Joint (Swivel) | 309-320 | Center Joint Disassembly, Reassembly, Seal Replacement |
| Cylinders | 321-350 | Cylinder Theory of Operation, Disassembly, Reassembly, Piston Jig, Steel Bushing Jig |
| Swing Motor | 351-386 | Swing Motor Theory, Relief Valve, Parking Brake, Disassembly, Reassembly, Performance Test |
| Travel Motor | 387-446 | Travel Motor Theory, Counterbalance Valve, Disassembly, Reassembly, Performance Test, Oil Filling |
| Main Pump | 447-502 | Main Pump Sectional View, Rotary Group, Control Module, Sealing Drive Shaft, Pump Assembly |
| Gear Pump | 503-514 | Disassembling Single Gear Pump (Opt), Reassembling Single Gear Pump (Opt), Mounting Flange Removal, Back-Up Ring and Seal Fitting, Applicable Serial Number Ranges |
| Main Control Valve | 515-582 | Main Control Valve Sectional View, Spool Assembly, Main Relief Valve, Port Relief Valve, Disassembly, Reassembly |
| Remote Control Valve (Work Lever / Joystick) | 583-604 | Joystick Operation, Output Pressure Test, Disassembly, Return Springs and Plungers, Reassembly |
| Travel Control Valve (with Damper) | 605-630 | Travel Pedal and Damper Operation, Disassembly, Reassembly, Adjustment |
| Solenoid Valve Assembly | 631-648 | Functions of the 5-Solenoid Valve Assembly, Parts List and Reference Numbers, Cautions During Disassembly and Reassembly, Applicable Serial Number Ranges |
| Breaker EPPR Valve (Opt) | 649-660 | Breaker EPPR Valve Operation, Pressure Control, Testing, Adjustment |
| Hydraulic Schematic DX300LC/DX300LCA/DX340LCA | 661-667 | Full Hydraulic Schematic, Circuit Routing by Model |
| Electrical System | 668-788 | Electrical Supply System, Engine Starting Circuit, Charging System, Monitoring System, Power Mode Control, Engine Control System |
| Attachments | 789-818 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main relief pressure (normal operation) | 330 kg/cm2 (4,689 psi) | p. 72 |
| Main relief pressure (with Pressure Up) | 350 kg/cm2 (4,970 psi) | p. 72 |
| Swing relief valve pressure | 285 kg/cm2 (4,052 psi) | p. 280 |
| Pilot pressure at the pump | 40 ±5 bar (580 ±73 psi) | p. 284 |
| Joystick (remote control valve) output pressure | 23.5 ±1.5 bar (341 ±22 psi) | p. 284 |
| Swing motor standard oil flow | 329 l/min (86.9 gpm) | p. 362 |
| Fuel tank capacity | 550 liters (145 U.S. gal) | p. 66 |
| Hydraulic system capacity | 324 liters | p. 66 |
| Cabin floor mounting nut torque | 21 kg•m (205 N•m, 150 lbf ft) | p. 128 |
| Swing reduction gear lock plate bolt (M16x40, Loctite #262) | 2,700 kgf•cm | p. 201 |
| Main relief valve tightening torque | 7.95 - 8.97 kg•m (58 - 65 ft lb) | p. 575 |
| Hose clamp torque - "T" bolt (radiator, air cleaner, boots) | 0.68 - 0.72 kg•m (59 - 63 in lb) | p. 110 |
| Lower roller clearance between shaft and bushing | 0.404 - 0.48 mm | p. 238 |
| Lower roller interference between roller and bushing | 0.11 - 0.21 mm | p. 238 |
