Part of the Doosan Repair Manuals.
Chasing electrical gremlins on your DX340LC-5 or DX350LC-5? This 496-page Doosan diagnostic manual PDF is the factory troubleshooting reference for both crawler excavators. You get complete failure code tables covering E-ECU and gauge panel communication errors, wiring pin-outs for every connector, relay, and fuse on the machine, plus hydraulic schematics for tracing pump, main control valve, and proportional valve faults. Inside: step-by-step sensor testing procedures, DMS diagnosis routines for pump relief pressure and boom, arm, and bucket operation, and performance standard tables for cycle times, travel speed, and swing speed. Check the coolant temperature sensor at 10,000 ohms at 20 degrees C, and confirm the breaker solenoid valve reads 27.6 ohms before you condemn the harness. No more chasing wiring faults with a multimeter and a prayer. Bookmarked with a full text layer: search any fault code, jump straight to the fix, and get back to work.
What's Inside This Doosan DX340LC-5, DX350LC-5 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information on Troubleshooting | 3-38 | Safety Instructions |
| Diagnostic Procedures and Related Device of Wiring Devices | 39-100 | Connectors, Fuse List, Relay, Circuit Breakers, Battery Disconnector Switch, Diodes, Sensors |
| Specifications | 101-122 | Performance Tests, Operational Performance Standard Table, Hydraulic Cylinder Cycle Time, Travel Speed, Swing Speed |
| Failure Code Table and Communication Errors | 123-144 | Failure Code Table, Gauge Panel Communication Error, E-ECU Communication Error |
| Proportional Valve Troubleshooting | 145-159 | Pump Proportional Valve (a), Pump Proportional Valve (B), Fan Control Proportional Valve (J), Press. Control Proportional Valve, Flow Control Proportional Valve |
| Relay, Sensor, and Electrical System Troubleshooting | 160-236 | Alarm Relay, Starter Relay, Thumb Wheel, Oil Temperature Sensor, Fuel Sensor, Wif Sensor, Angle Sensor, Alternator Potential |
| Hydraulic and Mechanical System Troubleshooting | 237-317 | Starter Switch, Auto Idle, Wiper Motor, Work Equipment Operation, Travel Operation, Swing Operation, Hydraulic Pump, Main Control Valve |
| Troubleshooting by the Dms | 318-408 | Dms Diagnosis, Pump Relief Pressure, Swing Relief Pressure, Boom Up/Down Operation, Arm Crowding/Dumping Operation, Bucket Crowding/Dumping Operation, Travel Operation |
| Troubleshooting by the Dms | 409-496 | D-Eco Power System, Pump Relief Pressure, Swing Relief Pressure, Boom Up Operation, Arm Crowding Operation, Air Bleeding of Control Valve |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Resistance at 20°C | 10,000 Ω | p. 92 |
| Engine power limitation temperature | 116 - 117°C | p. 97 |
| Cylinder Creeping (Boom) | below 20 mm/5 min | p. 112 |
| Cylinder Creeping (Arm) | below 20 mm/5 min | p. 112 |
| Breaker Operating Solenoid Valve Resistance | 27.6 Ω ±5% | p. 226 |
| Breaker Operating Solenoid Valve Voltage | 24 V DC ±10% | p. 226 |
| Resistance at -40°C | 39,649 ±2,641 Ω | p. 244 |
| Coolant overheating level | 113°C (235.4°F) | p. 365 |
| Standard Boom Weight | 2,697 kg | p. 106 |
| Counterweight Weight | 7,100 kg | p. 106 |
| Fuel Tank Capacity | 600 liters | p. 106 |
| Hydraulic System Capacity | 450 liters | p. 106 |
Doosan DX340LC-5, DX350LC-5 Common Problems This Manual Covers
Doosan DX340LC-5 shows E003 coolant temperature sensor fault, temp gauge reads erratic or pegged
Disconnect the coolant temperature sensor and measure resistance across the terminals. You should see 10,000 Ω at 20°C; the full table on page 244 gives 5,489 ±242 Ω at 0°C and 197 ±2 Ω at 100°C. Out-of-range readings mean a failed sensor. If resistance checks good, chase harness continuity back to the E-ECU.
Manual Section: Electrical System Troubleshooting Procedures p. 244Hydraulic pressure drops under load, boom and arm slow down when digging deep
Connect a gauge to the pump test port and stall the boom circuit. Piston pump relief pressure should read 350 bar per page 294; main relief valve pressure is 380 bar on page 296. Then check pump angle sensor output: 0.5 ±0.1 V at minimum angle, 4.4 ±0.1 V at maximum. Adjust the relief valve if pressure stays low.
Manual Section: Hydraulic and Mechanical System Troubleshooting Procedures p. 294Engine overheats after two hours of continuous operation, coolant gauge climbs into the red
Confirm the overheat is real before pulling parts. The warning triggers at 113°C (235.4°F) and releases at 107°C per page 365, and engine speed derates to 1,200 rpm during the event. Test the coolant temperature sensor, which should read 197 ±2 Ω at 100°C. If the sensor checks good, follow the coolant overheat troubleshooting procedure.
Manual Section: Troubleshooting by the DMS p. 365One track travels weak or will not move, machine pulls to one side
Block the affected track and measure travel relief pressure at the test port. Spec is 380 ±5 bar for both RH and LH travel forward circuits per page 349. If pressure is at spec, test travel motor internal leakage against 343 bar (4,975 psi) at 25 L/min on page 373 before condemning the motor.
Manual Section: Troubleshooting by the DMS p. 349Swing operation sluggish or upper structure drifts when parked on a slope
Test swing motor relief pressure first; spec is 280 bar per page 310. Then check the swing brake release solenoid valve (K): coil resistance should measure 27.6 Ω ±5% on page 229, with 24 V DC ±10% at the connector when energized. Verify swing pilot sensor output, 1.0 V in neutral and 4.2 V at full stroke.
Manual Section: Hydraulic and Mechanical System Troubleshooting p. 310Frequently Asked Questions
What are the torque specifications for the gauge panel mounting bolts?
The mounting bolts for the gauge panel should be tightened to a torque of 12.3 N.m (1.25 kg.m, 9 ft lb). p. 31
What is the torque specification for the EPOS box mounting bolts?
The mounting bolts for the EPOS box should be tightened to a torque of 19.6 N.m (2 kg.m, 14.5 ft lb). p. 33
What is the fuel tank capacity for the DX340LC-5/DX350LC-5?
The fuel tank capacity for the DX340LC-5/DX350LC-5 is 600 liters (158.5 U.S. gal). p. 106
What is the hydraulic system capacity for the DX340LC-5/DX350LC-5?
The hydraulic system capacity for the DX340LC-5/DX350LC-5 is 450 liters (118.8 U.S. gal). p. 106
What is the resistance value for the coolant temperature sensor at 20°C?
The resistance value for the coolant temperature sensor at 20°C is 2,419 ±85 Ω. p. 244
What do I get after purchasing this Doosan DX340LC-5, DX350LC-5 manual?
This is a 496-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this Doosan DX340LC-5, DX350LC-5 manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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