Doosan DX490LC-3 and DX530LC-3 Excavator Service Manual

Table of Contents

Safety
Track Excavator Maintenance Safety …………………………………………… SP002618
Specifications
Specification for DX490LC-3/DX530LC-3……………………………………… SP002557
General Maintenance
General Maintenance Instructions……………………………………………….. SP002454
Standard Torques……………………………………………………………………… SP002404
Upper Structure
Cabin ………………………………………………………………………………………. SP002324
Counterweight…………………………………………………………………………… SP002558
Fuel Tank…………………………………………………………………………………. SP002559
Fuel Transfer Pump (Option) ………………………………………………………. SP002560
Swing Bearing…………………………………………………………………………… SP002329
Lower Structure and Chassis
Track Assembly ………………………………………………………………………… SP002561
Engine and Drivetrain
Engine……………………………………………………………………………………… SP002540
Engine Coolant Heater (Option) ………………………………………………….. SP002328
Drive Coupling (Main Pump)……………………………………………………….. SP002562
Hydraulics
Hydraulic System Troubleshooting, Testing and Adjustment …………… SP002563
Accumulator……………………………………………………………………………… SP002455
Center Joint (Swivel)………………………………………………………………….. SP002545

Cylinders………………………………………………………………………………….. SP002564
Swing Device……………………………………………………………………………. SP002565
Travel Device……………………………………………………………………………. SP002566
Main Pump……………………………………………………………………………….. SP002567
Gear Pump ………………………………………………………………………………. SP002568
Main Control Valve ……………………………………………………………………. SP002569
Fan Motor for Oil Cooler …………………………………………………………….. SP002576
Fan Motor for Radiator……………………………………………………………….. SP002577
Fan Pump ………………………………………………………………………………… SP002583
Remote Control Valve (Work Lever / Joystick) ………………………………. SP002578
Travel Control Valve (with Damper)……………………………………………… SP002381
Solenoid Valve Assembly …………………………………………………………… SP002406
Breaker EPPR Valve (Option) …………………………………………………….. SP002458
Hydraulic Schematic………………………………………………………………….. SP002570
Electrical System
Electrical System ………………………………………………………………………. SP002571
Electrical Schematic ………………………………………………………………….. SP002572
Attachments
Boom and Arm………………………………………………………………………….. SP002573
Bucket……………………………………………………………………………………… SP002574

How to Use The Guide Manual

This manual provides information for servicing the 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 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.

Instruction Extracts

IAT and MAF Sensors
The IAT and MAF sensors are installed on the intake duct. The IAT sensor detects the intake air temperature, and the MAF sensor detects the intake airflow amount. In the IAT sensor, the thermistor changes the resistance value according to temperature changes. The resistance characteristics are comprised of a low resistance value when the intake air temperature is high and a high resistance value when the intake air temperature is low.

The ECM applies 5 V to the IAT sensor through the pull-up resistor and calculates the intake air temperature from changes in the voltage. This value is used in various control mechanisms, such as fuel injection control.
The MAF sensor detects the intake airflow amount that is sent to the engine. Based on this information from the MAF sensor, the ECM monitors the operation conditions of the engine to calculate the fuel supply.
The ECM recognizes information such as a large amount of air entry indicating acceleration or high-load state, and a small amount of air entry indicating deceleration or an idling state.
Intake Throttle Valve

The intake throttle valve is installed on the intake duct. It is driven by the intake throttle motor, and the intake throttle position sensor detects the valve position. Since the intake throttle valve raises the engine exhaust temperature during DPD regeneration, it controls the intake air amount.