Part of the Doosan Repair Manuals.
All 976 pages of this Doosan DX380LC-3 Shop Manual PDF (OEM #950106-00228E) exist for one purpose: getting your excavator digging again, and its shared service sections are printed as applicable across the wider DX-3 range, from the DX140LC-3 up to the DX420LC-3. You get full hydraulic schematics, electrical wiring diagrams, and a complete troubleshooting, testing and adjustment section that walks you through pilot pressure checks, pump swash plate adjustment, and flow meter testing. Inside: teardown and reassembly procedures for the main pump, swing device, cylinders, center joint, and main control valve, backed by page after page of standard torque tables. Check track tension at 380-410 mm of clearance, and plan fluid service around the 600-liter (158.5 U.S. gal) fuel tank. No more chasing hydraulic faults with a gauge and a hunch. Bookmarked for fast jumps; search any spec by keyword, load it on your phone, and get back to work.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-72 | Track Excavator Maintenance Safety |
| Specifications | 73-100 | Specification for DX380LC-3 |
| General Maintenance | 101-138 | Standard Torques |
| Upper Structure | 139-200 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing |
| Lower Structure and Chassis | 201-234 | Track Assembly |
| Engine and Drivetrain | 235-262 | Engine Coolant Heater, Drive Coupling |
| Hydraulic System Troubleshooting, Testing and Adjustment | 263-320 | Troubleshooting, Pilot Pressure, Pump Swash Plate, Pump Epprv, Pump Pressure, Flow Meter Testing |
| Accumulator | 321-330 | Gas-Charged Storage, Precharge Pressure, Diaphragm, Pressure Testing |
| Center Joint (Swivel) | 331-360 | Disassembly, Reassembly, Slipper Seals, Wear Rings, O-Ring Replacement |
| Cylinders | 361-414 | Boom Cylinders, Arm Cylinders, Piston Nut, Slipper Seal Jig, Cylinder Disassembly |
| Swing Device | 415-474 | Reduction Gear, Swing Motor, Brake Operation, Reactionless Valve, Taper Roller Bearing |
| Main Pump | 475-542 | Axial Piston Unit, Manual Override, Shaft Seal Replacement, Gear Pump, Pressure Reducing Valve |
| Gear Pump | 543-554 | Disassembly, Reassembly, Mounting Flange, Shaft Seal, Pressure Plates |
| Fan Motor for Oil Cooler, Fan Pump, Main Control Valve, Breaker EPPR Valve, Hydraulic Schematic | 555-776 | Fan Motor, Fan Pump, Main Control Valve, Breaker EPPR Valve, Hydraulic Schematics |
| Electrical System | 777-946 | Electrical Supply System, Engine Starting Circuit, Engine Preheating System, Charging System, Monitoring System, Wiper System |
| Attachments | 947-976 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel tank capacity | 600 liters (158.5 U.S. gal) | p. 171 |
| Force required to move the bucket for lateral play check | less than 100 lb | p. 196 |
| Bushing Outside Diameter | 66 mm (2.60") | p. 213 |
| Link Height | 122 mm (4.80") | p. 213 |
| Normal track tension clearance | 380 - 410 mm (14.96 - 16.14 in) | p. 210 |
| Muddy, Sandy or Snowy track tension clearance | 410 - 460 mm (16.14 - 18.11 in) | p. 210 |
| Hydraulic reservoir return line filter | 10 micron | p. 272 |
| Pilot circuit filter | 30 micron | p. 272 |
| Internal sealing PF3/4 engagement torque | 15 ± 1.09 kg•m | p. 318 |
| External sealing PT3/8 engagement torque | 4.5 - 9.5 kg•m | p. 318 |
| Internal and external air purification filters cleaning interval | 500 hours | p. 898 |
| Wear points on the working surfaces of tooth points | 8 mm to 10 mm (1/3" to 1/2") | p. 966 |
