Original Instructions
Copyright DOOSAN 2014
Serial Number 10001 and Up
Shop Manual
DX420LC-5 Excavator
950106-01020E
April 2014
DOOSAN and the DOOSAN logo are registered
trademarks of DOOSAN Corporation in the United
States and various other countries around the
world.
Table of Contents
Page I
1Table of Contents
1 Safety
1
Track Excavator Maintenance Safety
2 Specifications
1
Specifications
3 General Maintenance
1
General Maintenance Instructions
2
Standard Torques
4 Engine
1
Engine
2
Engine Coolant Heater (Option)
5 Upper Structure
1
Cabin
2
Counterweight
3
Oil Tank
4
Fuel Tank
5
Main Pump
6
Drive Coupling (Main Pump)
7
Main Control Valve
8
Swing Device
9
Fan Pump for Oil Cooler
10
Fan Motor for Oil Cooler
11 Gear Pump (Rotation)
12
Joystick Valve (Work Lever)
13
Travel Control Valve (with Damper)
14 Solenoid Valve
15 EPPR Valve
16 Accumulator
Table of Contents
Page II
6 Lower Structure and Chassis
1
Swing Bearing
2
Center Joint
3
Travel Device
4
Track Assembly
7 Front
1
Boom and Arm
2
Bucket
3
Cylinders
8 Hydraulic System
1
Hydraulic System
2
Hydraulic System Testing and Adjustment
3
Hydraulic System Troubleshooting
9 Electrical System
1
Electrical System
2
Electrical System Troubleshooting
10 Options
1
One Way
2
Two-way
3
Rotating
4
Quick Coupler
11 Schematic
1
Hydraulic Schematic/Electrical Schematic
Track Excavator Maintenance Safety
1-1-1
DX420LC-5
Track Excavator
Maintenance
Safety
Edition 1
Track Excavator Maintenance Safety
1-1-3
DX420LC-5
Table of Contents
Track Excavator Maintenance Safety
Safety Instructions ..........................................1-1-5
Safety Messages ............................................1-1-5
General ...........................................................1-1-6
Transportation ..............................................1-1-19
Operation......................................................1-1-21
Maintenance .................................................1-1-38
Environment and Circumstances..................1-1-55
Track Excavator Maintenance Safet