Doosan DX420LC User manual

K1009096E Shop Manual
Copyright 2005 Doosan
Doosan reserves the right to improve our products in a continuing process to provide the best possible
product to the market place. These improvements can be implemented at any time with no obligation to
change materials on previously sold products.It is recommended that consumers periodically contact their
distributors for recent documentation on purchased equipment.
This documentation may include attachments and optional equipment that is not available in your
machine's package.Please call your distributor for additional items that you may require.
Illustrations used throughout this manual are used only as a representation of the actual piece of
equipment, and may vary from the actual item.
Shop Manual
K1009096E
Serial Number 5001 and Up
DX420LC

Product Label
Instructions
Trim OutThe Label Along
The Lines And Insert Into
Pocket OnThe Binder Spine
DX420LC Serial Number 5001 and Up Pub.No. K1009096E
Pub. No. K1009096E

Table of Contents
Page I
1
Table of Contents
Safety
Track Excavator Safety......................................................................... SP000256
Specifications
Specification for DX420LC.................................................................... SP000257
General Maintenance
General Maintenance Procedures........................................................ SP000016
Standard Torques................................................................................. SP000017
Upper Structure
Cabin .................................................................................................... SP000018
Counterweight....................................................................................... SP000265
Fuel Tank.............................................................................................. SP000264
Swing Bearing....................................................................................... SP000262
Swing Reduction Gear.......................................................................... SP000249
Lower Structure and Chassis
Track Assembly .................................................................................... SP000263
Air Conditioner...................................................................................... SP000025
Engine and Drive Train
Drive Coupling (Main Pump)................................................................. SP000026
Hydraulics
Hydraulic System Troubleshooting, Testing and Adjustment ............... SP000273
Accumulator.......................................................................................... SP000028
Center Joint (Swivel)............................................................................. SP000181
Cylinders............................................................................................... SP000030

Table of Contents
Page II
Swing Motor.......................................................................................... SP000261
Travel Motor (With Gearbox) ................................................................ SP000266
Main Pump............................................................................................ SP000186
Control Valve (KVMG-400-DA)............................................................. SP000187
Remote Control Valve (Work Lever / Joystick)..................................... SP000189
Travel Control Valve (With Damper)..................................................... SP000070
Solenoid Valve Assembly ..................................................................... SP000191
Breaker EPPR Valve (Opt) ................................................................... SP000192
Fan Motor (Vane Type)......................................................................... SP000209
Gear Pump (Fan Cooling Drive) ........................................................... SP000208
Fan Cooling Flow In-Out Change Valve ............................................... SP000207
Hydraulic Schematic (DX420LC).......................................................... SP000274
Electrical System
Electrical System .................................................................................. SP000269
Electrical Schematic (DX420LC) .......................................................... SP000275
Attachments
Boom and Arm...................................................................................... SP000463
Bucket................................................................................................... SP000072

1
Safety

SP000256
Page 1
Track Excavator Safety
SP000256
TRACK EXCAVATOR SAFETYSP000256
Track
Excavator
Safety
Edition 1

Track Excavator Safety
SP000256
Page 2
MEMO