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 Doosan DX340LCA, DX300LCA 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 |
Doosan DX340LCA, DX300LCA Common Problems This Manual Covers
Doosan DX340LCA hydraulic system overheating and losing lifting power after long digging cycles
Check hydraulic reservoir oil level first; low oil is the usual cause after missed daily checks. Confirm operating temperature against the 50°C (122°F) baseline on page 276, and pull the 177 micron intake strainer to look for sludge. Test main relief pressure at 330 kg/cm2 per page 72, then adjust per the procedure starting on page 267.
Manual Section: Hydraulic System Troubleshooting, Testing and Adjustment p. 276Engine loses power and stalls after cold start in dusty working conditions
Remove and inspect the air cleaner element; in heavy dust, replace it weekly instead of waiting for the normal interval. Check intake boots for cracks and retighten T-bolt hose clamps to 0.68 - 0.72 kg•m (59 - 63 in lb) using the torque chart on page 110. Verify fuel level and drain any water from the fuel filter.
Manual Section: General Maintenance p. 110Machine pulls to one side during straight travel, deviation gets worse under load
Run the travel deviation test on level ground using the baseline procedure starting on page 267. Verify pilot pressure at the pump reads 40 ±5 bar (580 ±73 psi) as listed on page 284. If pressures check good, inspect the travel control valve spools for sticking, then check the counterbalance valve on the slow side in the travel motor section starting on page 387.
Manual Section: Travel Motor p. 387Swing motor will not rotate or leaks oil around the reduction gear housing
Test swing relief valve pressure; it should hold 285 kg/cm2 (4,052 psi) as specified on page 280. If pressure is good, inspect the parking brake release circuit using the swing motor section starting on page 351. For housing leaks, replace the gearbox seals and torque the mounting bolts to 2,700 kgf•cm per page 201.
Manual Section: Swing Motor p. 351Joysticks feel sluggish or work controls do not return to neutral after release
Measure joystick output pressure at the remote control valve; spec is 23.5 ±1.5 bar (341 ±22 psi) listed on page 284. If pressure is within range, disassemble the joystick and inspect the return springs and plungers for binding, following the remote control valve procedure in the section starting on page 503. Clean the spool bores before reassembly.
Manual Section: Remote Control Valve (Joystick) Troubleshooting p. 503Frequently Asked Questions
How do I reset the service hour counter for the filter and oil information?
To reset the operating hours for filters and oils, go to the 'Filter/Oil Info' mode in the main menu. After changing the filter and oil, reset the operating hour so that the hours until the next service interval can be easily checked. p. 700
What is the tightening torque for the mounting nuts on the cabin floor?
The mounting nut torque for the cabin floor is 21 kg•m (205 N•m, 150 lbf ft). p. 128
What is the fuel tank capacity for the DX340LCA?
The fuel tank capacity for the DX340LCA is 550 liters (145 U.S. gal). p. 66
What is the tightening torque for the main relief valve?
The tightening torque for the main relief valve is 7.95 - 8.97 kg•m (58 - 65 ft lb). p. 575
What is the standard oil flow for the swing motor?
The standard oil flow for the swing motor is 329 l/min (86.9 gpm). p. 362
How is this Doosan DX300LCA Shop Manual delivered?
Instant PDF download. You get the full 818-page searchable Shop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this Doosan DX300LCA manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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