Doosan DX420LC-3 Excavator Service Manual Workshop Guide

Manual Included: Shop Manual: 1902 Pages Specifications: Brand: John Deere Model: DX420LC-3 Serial Number: 5000 and Up Type: Excavator Manuals: Shop Manual Publication Numbers: 950106-00398E(July 2012) Language: English Format: PDF Description Table of Contents Safety Track Excavator Maintenance Safety …………………………………………… SP002322 Specifications Specification for DX420LC-3 ………………………………………………………. SP002670 General Maintenance General Maintenance Instructions……………………………………………….. SP002454 Standard Torques……………………………………………………………………… SP002404 Upper Structure Cabin ………………………………………………………………………………………. SP002324 Counterweight…………………………………………………………………………… SP002697 Fuel Tank…………………………………………………………………………………. SP002699 Fuel Transfer Pump (Option) ………………………………………………………. SP002560 Swing Bearing…………………………………………………………………………… SP002329 Lower Structure and Chassis Track Assembly ………………………………………………………………………… SP002561 Engine and Drivetrain Engine……………………………………………………………………………………… SP002654 Engine Coolant Heater (Option) ………………………………………………….. SP002328 Drive Coupling (Main Pump)……………………………………………………….. SP002562 Hydraulics Hydraulic System Troubleshooting, Testing and Adjustment …………… SP002655 Accumulator……………………………………………………………………………… SP002455 Center Joint (Swivel)………………………………………………………………….. SP002545 Cylinders………………………………………………………………………………….. SP002769 Swing Device……………………………………………………………………………. SP002653 Travel Device……………………………………………………………………………. SP002609 Main Pump……………………………………………………………………………….. SP002567 Gear Pump ………………………………………………………………………………. SP002568 Fan Motor for Oil Cooler …………………………………………………………….. SP002576 Fan Motor for Radiator……………………………………………………………….. SP002577 Fan Pump ………………………………………………………………………………… SP002553 Main Control Valve ……………………………………………………………………. SP002656 Remote Control Valve (Work Lever / Joystick) ………………………………. SP002578 Travel Control Valve (with Damper)……………………………………………… SP002381 Solenoid Valve Assembly …………………………………………………………… SP002406 Breaker EPPR Valve (Option) …………………………………………………….. SP002458 Hydraulic Schematic………………………………………………………………….. SP002671 Electrical System Electrical System ………………………………………………………………………. SP002571 Electrical Schematic ………………………………………………………………….. SP002572 Attachments Boom and Arm………………………………………………………………………….. SP002669 Bucket……………………………………………………………………………………… SP002421 CMP Sensor The CMP sensor is installed on the supply pump portion, and a CMP signal is generated every time the cam portion of the camshaft inside the supply pump passes the sensor.The ECM determines the cylinder and specifies the crank angle based on the CKP signal and the CMP signal input from the CMP sensor, and uses the information for the fuel injection control and calculation of the engine rpm. While this control is usually performed using the CKP signal, the CMP signal is used instead when the CKP sensor is faulty. Oil Pressure Sensor The oil pressure sensor is installed near the starter motor of the cylinder block, it detects the pressure of the engine oil to convert it into a voltage signal, then sends it to the ECM. The voltage becomes higher when the pressure is higher, and it becomes lower when the pressure is lower. 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.