Doosan Daewoo DX420LC Excavator Service Manual

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
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………………………………………………………………………….. SP000040
Bucket……………………………………………………………………………………… SP000041

How to Use The Doosan Daewoo DX420LC Crawler Excavator Manual

This manual provides information for servicing the DX420LC Crawler Excavator. All service procedures are broken down into detailed steps, listed in their recommended sequence. The manual uses both photographs and drawings to help locate and itemize components. The table of Contents on the preceding pages is your best tool for finding the service procedure you need. Be certain to observe all Safety information included in these pages.

A schematic of each of the major engine systems is provided at the beginning of the section of the manual devoted to troubleshooting and repairing that particular system.

Basic safety precautions are list in the Safety section of the Doosan Daewoo DX420LC Excavator Service Manual. Additional safety precautions are list in the Safety section of the owner/operation/maintenance publication. Specific safety warnings for all these publications are provided in the description of operations where hazards exist. WARNING labels have also been put on the product to provide instructions and to identify specific hazards.