Part of the Doosan Repair Manuals.
This is the factory shop manual for the Doosan DX340LC-3 and DX350LC-3 crawler excavators, publication 950106-00225E, serial 1001 and up (10001 and up for Europe). Yes, both models - the cover says DX340LC-3/DX350LC-3, so if you run the 34-ton machine this same book covers you. Inside you get teardown and assembly for the upper structure, tracks and final drives, the full hydraulic circuit with test pressures (main relief 350 kg/cm2, 370 with Pressure Up), electrical schematics for the monitor panel, and maintenance intervals for a machine carrying 600 L of fuel and 450 L of hydraulic oil. This is the book Doosan dealer techs work from, not an operator pamphlet.
What's Inside This Doosan DX350LC-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-72 | Safety Precautions, Decals, Lifting and Towing |
| Specifications | 73-102 | Machine and Engine Specifications, Working Ranges, Weights, Capacities, Relief Pressures |
| General Maintenance | 103-140 | Service Intervals, Fluids and Lubricants, Filters, Standard Torques |
| Upper Structure | 141-202 | Cab, Counterweight, Swing Bearing and Swing Motor, Tanks |
| Lower Structure and Chassis | 203-236 | Track Frame, Travel Motor, Idler, Rollers, Track Chain |
| Engine and Drivetrain | 237-264 | Engine Removal and Overhaul, Cooling, Fuel System, Air Intake |
| Hydraulic Troubleshooting, Testing and Adjustment | 267-300 | Symptom Charts, Pressure Tests, Main Relief 350 kg/cm2 and Pressure Up 370 kg/cm2 Settings |
| Accumulator, Center Joint and Cylinders | 301-364 | Accumulator, Center Joint (Swivel), Boom, Arm and Bucket Cylinders |
| Swing and Travel Devices | 365-478 | Swing Motor and Reduction Gear, Travel Motor and Final Drive Overhaul |
| Main Pump, Gear Pump and Fan Circuit | 479-606 | Main Pump Overhaul and Regulator, Gear Pump, Oil Cooler Fan Motor and Fan Pump |
| Control Valves and Solenoids | 607-806 | Main Control Valve, Prv, Sensor Block, Remote Control (Joystick) Valve, Travel Control Valve, Solenoid Valve Assembly, Breaker Eppr Valve |
| Hydraulic Schematic | 807-814 | Full Hydraulic Circuit Schematic Sheets |
| Electrical System | 815-984 | Wiring and Electrical Schematics, Sensors, Switches, Starting and Charging |
| Attachments | 985-1014 | Bucket, Breaker Piping and Optional Attachment Hydraulics |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Rated Power | 285 ps @ 1,800 rpm (281 hp @ 1,800 rpm) | p. 93 |
| Max. Torque | 130 kg.m @ 1,300 rpm (940 ft lb @ 1,300 rpm) | p. 93 |
| Rated RPM (for power) | 1,800 rpm | p. 93 |
| Rated RPM (for max torque) | 1,300 rpm | p. 93 |
| Fuel Tank Capacity | 600 liters (158.5 U.S. gal) | p. 90 |
| Hydraulic System Capacity | 450 liters (118.8 U.S. gal) | p. 90 |
| Hydraulic Reservoir Capacity | 240 liters (63.4 U.S. gal) | p. 90 |
| Main Relief Pressure (normal operation) | 350 kg/cm² (4,978 psi) | p. 96 |
| Main Relief Pressure (with 'Pressure Up') | 370 kg/cm² (5,263 psi) | p. 96 |
| Shipping Weight | 34.9 tons (76,941 lb) | p. 90 |
| Shipping Weight (add for 700 mm (28") shoes) | 380 kg (838 lb) | p. 90 |
| Shipping Weight (add for 800 mm (32") shoes) | 760 kg (1,676 lb) | p. 90 |
| Shipping Weight (add for 850 mm (33.5") shoes) | 945 kg (2,083 lb) | p. 90 |
| Shipping Weight (add for 900 mm (36") shoes) | 1,140 kg (2,513 lb) | p. 90 |
| Shipping Weight (add for 600 mm (24") double grouser shoes) | 526 kg (1,160 lb) | p. 90 |
Doosan DX350LC-3 Common Problems This Manual Covers
Slow cycle times and weak digging force that gets worse as the oil warms up
Run the pump flow and pressure tests in the Hydraulics section, checking main relief against the 350 kg/cm2 spec before condemning the pump. The section covers relief valve adjustment, filter service, and pump teardown if wear is confirmed.
Manual Section: Hydraulics p. 265Monitor panel shows a warning but you cannot pull up the stored fault data
The Electrical System section documents the monitor panel service screens, the button navigation to reach diagnostic and stored fault displays, plus wiring schematics to chase sensor circuits when the panel points you to one.
Manual Section: Electrical System p. 815Engine shuts down or derates from overheating or low oil pressure warnings
Engine and Drivetrain gives cooling system test procedures, oil pressure specs, and fuel system checks so you can separate a real mechanical problem from a bad sender before pulling anything heavy off the machine.
Manual Section: Engine and Drivetrain p. 237Track sag, thrown tracks, or a final drive that whines under load
Lower Structure and Chassis covers track tension adjustment, roller and idler wear limits, and final drive removal, disassembly, and reassembly, including the checks that tell you whether the drive is worth rebuilding.
Manual Section: Lower Structure and Chassis p. 203Frequently Asked Questions
Does this manual cover the DX340LC-3 too, or only the DX350LC-3?
Both. The manual is published as one book for the DX340LC-3 and DX350LC-3 since they share the same structure, hydraulics, and electrical system. If your machine is the 340, you are buying the right manual. p. 90
Can I read and clear fault codes from the cab with this manual?
Yes. The Electrical System section walks through the LCD monitor panel, how to enter the service and diagnostic screens with the panel buttons, and how to work through stored fault information. The button sequence is timing sensitive, which is why guys give up on it - the manual shows the exact procedure so you stop guessing.
My hydraulics are slow and weak. Will this manual help me find out why?
That is what the Hydraulics section is built for. It gives you the pump and main control valve test procedures, the relief settings to check against (350 kg/cm2 normal, 370 with Pressure Up active), and cylinder and swing motor specs. You can isolate whether it is filters, pump wear, or a relief valve before you throw parts at it.
Does it include the engine, or just the excavator side?
The Engine and Drivetrain section covers the engine as installed in this machine: removal and installation, cooling and fuel systems, and the drivetrain components. Rated output is 285 ps (281 hp) at 1,800 rpm with 940 ft lb of torque at 1,300 rpm, and the manual gives you the service data that goes with it.
I need to haul this machine. Are transport specs in here?
Yes, in Specifications. Shipping weight is 34.9 tons with standard 600 mm shoes, plus adders for wider pads (700 mm adds 380 kg, up to 900 mm adding 1,140 kg). Shipping dimensions, the 35-ton trailer requirement, and the 15 degree loading slope limit are all listed, so you can spec the lowboy before the machine shows up. p. 90
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