Complete workshop repair & service manual with electrical wiring diagrams for Doosan DX255LC Crawler Excavator. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.

This Doosan DX255LC Crawler Excavator service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.

“K1016585E.pdf”
Doosan DX255LC Crawler Excavator Shop Manual
K1016585E; Serial Number 5001 and Up; 826W pages

TABLE OF CONTENTS
Safety
Track Excavator Safety..................... SP000014
Specifications
Specification for DX255LC................ SP001009
General Maintenance
General Maintenance Procedures.............................. SP000016
Standard Torques............................. SP000813
Upper Structure
Cabin ......................... SP000943
Counterweight............ SP000940
Fuel Tank................... SP001012
Fuel Transfer Pump.......................... SP000021
Swing Bearing............ SP001068
Swing Reduction Gear...................... SP001015
Lower Structure and Chassis
Track Assembly ......... SP001016
Engine and Drive Train
Drive Coupling (Main Pump)................ SP001069
Hydraulics
Hydraulic System Troubleshooting, Testing and Adjustment ............... SP001017
Accumulator............... SP000028
Center Joint (Swivel)......................... SP000029
Cylinders.................... SP000030
Swing Motor............... SP001020
Travel Motor............... SP001021
Gear Pump ................ SP000931
Main Control Valve ........................... SP000034
Axial Piston Pump............................. SP001022
PTO Server................ SP000933
Remote Control Valve (Work Lever / Joystick) ........... SP000069
Travel Control Valve (with Damper)............................ SP000070
Solenoid Valve Assembly ................. SP000445
Breaker EPPR Valve (Opt) .................. SP000192
Hydraulic Schematic (DX255LC)......... SP001023
Electrical System
Electrical System.............................. SP001025
Electrical Schematic (DX180LC/DX225LC/225NLC/255LC) ................ SP000936
Attachments
Boom and Arm........... SP001026
Bucket........................ SP000939
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EXCERPT:
"HYDRAULIC SCHEMATIC"
"The hydraulic schematic(s) is available in the ""Hydraulic and"
"Electrical Schematic Shop Manual."" This manual is a collection of diagrams and schematics for a number of models."
"General Notes"
"When referring to the schematic, refer to the following items:"
"• As shown in the schematic, the main pump assembly is driven by the engine. Mechanical energy is converted to hydraulic power, generating the required hydraulic flow which drives the system. Two main pumps (a right side pump and a left side pump) make up the main pump assembly."
"• Hydraulic output from the right side pump is transmitted to the right side of the control valve. Output from the left side pump is transmitted to the valve spools on the left side of the control valve. Hydraulic output from the pilot pump is used to control the pump and to operate pilot and solenoid valves."
"• The right half of the hydraulic control valve, supplied by the right pump in the pump assembly, operates valve spools for right travel, swing, boom up and arm functions. The amount of oil flow to the actuators at the output end of each of those circuits is regulated through the movement of each individual valve spool."
"• The left half of the hydraulic control valve, fed by the left pump in the pump assembly, has control spools for left travel, bucket, boom and arm operation."
"• Two-stage operation is a feature of boom and arm function. All of these circuits can be operated using the output of only one half of the hydraulic pump assembly (one pump or the other), or – since both halves of the control valve have a spool and available circuit for these functions – the output of both pumps can be combined, allowing higher speed operation. Boom up, arm crowd and dumping functions can operate in any one of the two available power modes – the standard or general duty mode, the high speed/rapid cycling mode."
"• Whenever the right travel or left travel control spools are shifted, output from the main pump assembly flows through the center joint to one or both of the axial piston motors driving the side frame crawler tracks. A pilot valve connected to the swash plate of each travel motor changes motor capacity (and output) in direct proportion to the position of the travel switch selected by the operator."
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