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 Doosan DX380LC-3 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 |
Doosan DX380LC-3 Common Problems This Manual Covers
Doosan DX380LC-3 swing bearing play after long service, upper structure rocks and grinds during rotation
Check lateral play first: push the bucket sideways at ground level; it should move with less than 100 lb of force per the check on page 196. Measure axial play with a dial indicator between the bearing races. Grease the bearing through every fitting, and if play stays out of limit, plan a bearing overhaul.
Manual Section: Upper Structure p. 196Tracks derail on turns, excessive track sag, chain slaps the frame during travel
Measure track sag between the carrier roller and grouser; adjust the grease cylinder until clearance reads 380 to 410 mm on firm ground, or 410 to 460 mm in mud, sand, or snow, per page 210. Measure bushing outside diameter too; new spec is 66 mm on page 213, so replace worn links and bushings in sets.
Manual Section: Lower Structure and Chassis p. 210Hydraulic oil weeping under the cab at the center joint, one track travels weak
Test the center joint for internal leak-down before condemning the travel motors. Replace slipper seals, wear rings, and O-rings with the procedures that start on page 331. On reassembly, torque the internal PF3/4 sealing plug to 15 ± 1.09 kg•m and the M12 cover bolts to 10 to 12.5 kg•m per pages 318 and 320.
Manual Section: Center Joint (Swivel) p. 331Hydraulic oil temperature climbs fast, cooling fan runs constantly, power fades on hot afternoons
Blow out the dust net and oil cooler face with compressed air, working from the engine side outward. Verify hydraulic oil level; the reservoir holds 240 liters. If temperatures stay high with a clean cooler, test the fan motor and fan pump using the procedures that start on page 555.
Manual Section: Fan Motor for Oil Cooler, Fan Pump, Main Control Valve, Breaker EPPR Valve, Hydraulic Schematic p. 555Engine hard to start in the morning, loses power under load, surges after refueling
Drain water and sediment from the bottom of the 600 liter fuel tank before each shift; capacity is confirmed on page 171. Replace the prefilter and both fuel filters if the engine still starves under load. Bleed the lines and verify the fuel transfer pump delivers; tank and pump procedures start.
Manual Section: Upper Structure p. 171Frequently Asked Questions
How do I reset the maintenance reminder for the fuel filter on the Doosan DX380LC-3?
To reset the maintenance reminder, navigate to the 'Filter/Oil Information' screen. Locate the cursor on the 'Clear' option at the bottom right, click the jog switch, select the operation hour reset, and then select 'YES' to reset the timer. p. 814
What are the replacement specifications for track shoe links and bushings?
The standard dimension for the bushing outside diameter is 71.4 mm (2.81 in). The recommended limit for maintenance is 68 mm (2.68 in), and the limit for replacement is 66 mm (2.60 in). p. 213
What is the torque specification for the counterweight mounting bolts on the DX380LC-3?
The torque specification for the counterweight mounting bolts on the DX380LC-3 is 250 kg•m (1,807 ft lb). p. 163
What is the fuel tank capacity for the DX380LC-3?
The fuel tank capacity for the DX380LC-3 is 600 liters (158.5 U.S. gal). p. 171
What is the tightening torque for the travel control valve mounting bolts?
The tightening torque for the travel control valve mounting bolts (11) is 540 Nm (55 kg•m, 398 lb ft). p. 471
What do I get after purchasing this Doosan DX380LC-3 manual?
Instant PDF download. You get the full 976-page searchable Shop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print a copy of this Doosan DX380LC-3 Shop Manual for the shop?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
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