Doosan DX255LC Shop Manual K1016585E – PDF Service, Repair & Troubleshooting Guide (Serial 5001 and Up)

Description

Doosan DX255LC Shop Manual K1016585E – Complete PDF Service & Repair Guide (Serial Number 5001 and Up)

If you own, operate, or service the Doosan DX255LC track excavator, this K1016585E shop manual is the single most important document in your workshop. Covering serial numbers 5001 and up, it delivers the complete mechanical and electrical service information for this 25-ton class machine, from routine maintenance adjustments to full component overhauls.

Unlike an operator’s manual that only covers daily checks and controls, this Doosan DX255LC shop manual is a hands-on repair guide. It walks you through disassembly and reassembly of the major hydraulic, electrical, and structural components, provides troubleshooting decision trees, and lists the exact wear limits, torque values, and performance test criteria that keep the machine working within specification.

File Details

• Manual Type: Shop Manual (Service, Repair and Maintenance)
• Brand: Doosan
• Model: DX255LC
• Document Number: K1016585E
• Serial Number Coverage: 5001 and Up
• Language: English
• Page Count: 830 pages
• File Format: PDF

Chapters Covered

• Safety
• Specifications
• General Maintenance
• Upper Structure
• Lower Structure and Chassis
• Engine and Drivetrain
• Hydraulics
• Electrical System
• Attachments

Safety

The manual opens with the full Track Excavator Safety section (SP000014), applicable to the DX255LC and other Doosan excavator models from serial 5001 upward. It covers safety labels, lifting precautions in digging mode, hazard information, before-starting checks, machine operation guidelines, maintenance safety, battery handling, towing, shipping, and sling lifting procedures. Every repair procedure in this book assumes you have read and understood these precautions first.

Specifications

The Specification for DX255LC (SP001009) chapter lays out the machine’s general dimensions, working range diagrams, shipping and operating weights, digging forces, bucket capacity ranges, ground pressure ratings, and major component weights. It includes the engine performance curve for the DL06 engine, approximate material weights for earthmoving, and the factory performance standards for travel speed, swing speed, cylinder speed, and hydraulic relief pressures. These are the baseline figures you compare against when the machine feels sluggish or underpowered.

General Maintenance

Two chapters fall into this group. The General Maintenance Procedures (SP000016) section covers welding precautions, hydraulic system cleanliness, oil leak diagnosis, bearing inspection and wear identification, and the correct procedures for cleaning and inspecting components before reassembly. The Standard Torques (SP000017) section provides torque values for metric and U.S. fasteners, hose clamps, split flanges, phosphate-coated hardware, and torque wrench extension calculations, plus a Loctite application chart for thread lockers, pipe sealants, gasket eliminators, retaining compounds, and adhesives.

Upper Structure

This group of chapters (SP000943, SP000940, SP001012, SP000021, SP001068, SP001015) covers the cabin removal and installation, counterweight removal and installation, fuel tank service, fuel transfer pump repair, swing bearing maintenance and rebuilding, and the complete disassembly and reassembly of the swing reduction gear. The swing reduction gear chapter alone includes detailed step-by-step procedures with photos for carrier subassembly, main assembly, motor assembly, and the shrinkage fitting of shafts and bearings.

Lower Structure and Chassis

The Track Assembly chapter (SP001016) covers track tension adjustment, cleaning and inspection with wear limits and tolerances for track shoes, lower rollers, upper rollers, and front idlers, plus removal and installation of tracks, front idler rollers, lower rollers, upper rollers, and the track spring and adjusting cylinder. It includes complete parts lists for each track component.

Engine and Drivetrain

The Drive Coupling (Main Pump) chapter (SP001069) covers the installation of the drive coupling between the engine flywheel and the main pump, including the special tools required and the critical Measure H dimension that must be set to avoid noise and premature wear of the coupling or pump.

Hydraulics

The largest section of the manual. It begins with Hydraulic System Troubleshooting, Testing and Adjustment (SP001017), which covers the operation of the boom, arm, bucket, swing, and travel circuits, the pilot pressure and power mode valve adjustments, pump input power control, flow meter installation and testing, swing system troubleshooting, and troubleshooting guides for the swing gearbox, hydraulic problems, control valve, travel control valve, and joystick control valve.

The remaining hydraulic chapters cover the accumulator (SP000028), center joint or swivel (SP000029), cylinders (SP000030) with complete disassembly and reassembly including special tool dimensions, swing motor (SP001020), travel motor (SP001021), gear pump (SP000931), main control valve (SP000034), axial piston pump (SP001022) with regulator disassembly and reassembly, PTO server (SP000933), remote control valve or joystick (SP000069), travel control valve with damper (SP000070), solenoid valve assembly (SP000445), breaker EPPR valve optional (SP000192), and the complete hydraulic schematic for the DX255LC (SP001023).

Electrical System

The Electrical System chapter (SP001025) covers the electrical supply system, engine starting and preheating, charging, monitoring system, instrument panel operation, warning and indicator lights, graphic information display, main menus, special menus for diagnostics, the electronic hydraulic control system (e-EPOS), power mode control, work mode control, engine control system, automatic deceleration, engine overheat protection, power boost mode, automatic travel speed control, self-diagnostic function, air conditioner system, wiper system, lighting system, overload warning device, and audio controller. The Electrical Schematic chapter (SP000936) provides the complete wiring diagram for the DX180LC, DX225LC, DX225NLC, and DX255LC.

Attachments

The Boom and Arm chapter (SP001026) covers front attachment pin specifications with wear limits and clearances, removal and installation procedures for the arm and boom, and start-up procedures after attachment service. The Bucket chapter (SP000939) covers bucket tooth inspection and replacement, bucket O-ring replacement, and bucket attachment, removal, and reversal.

Why This Manual Matters for DX255LC Owners and Technicians

The DX255LC is a 25-ton class excavator that works hard in demanding conditions. When a hydraulic function gets sluggish, a travel motor starts drifting, or the swing brake won’t release, guessing at the problem costs time and money. This Doosan DX255LC shop manual gives you the systematic troubleshooting approach, the pressure and flow specifications, and the disassembly sequence so you can diagnose the fault and repair it correctly the first time.

Every major hydraulic component in the machine is covered with exploded parts lists, cross-sectional drawings, wear limits, and tightening torques. The electrical section goes beyond simple wiring diagrams into the e-EPOS controller, self-diagnostic codes, and sensor specifications, so you can trace faults through the electronic control system. The specification chapter gives you the factory baseline for travel speed, swing speed, cylinder speed, and relief pressures so you can objectively measure whether a repair has restored full performance.

Whether you are a Doosan dealer technician, an independent heavy equipment mechanic, or a fleet owner maintaining your own machine, having the complete K1016585E shop manual in PDF form means you can print the pages you need for the job, search the document on any device, and keep the manual accessible in the workshop or the field.

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Instant PDF Delivery

This Doosan DX255LC shop manual is delivered as an instant PDF download. There is no shipping, no waiting for a physical book, and no risk of a damaged or lost parcel. After checkout you can download the file immediately and open it on a laptop, tablet, or smartphone. Print the specific pages you need for the job, or keep the whole manual on a workshop tablet for quick reference. The PDF format makes it easy to search for a specific component, torque value, or troubleshooting symptom across all 830 pages.

If you work on the DX255LC, this manual belongs in your digital toolbox. It covers every system on the machine with the depth and detail that professional repair work demands.