Develon DX255LC-7 Crawler Excavator Shop Manual (950106-02512_C_EN)

Out on site this DX255LC-7 is usually in the rough stuff—demo piles, trench work, loading trucks, working banks and rock. This shop manual’s what you want when you’re past simple filters and need to tear in deep without guessing. It helps you plan the teardown, trace faults through the systems, and then get everything aligned and torqued right on the way back together. Say you’ve got a swing bearing noise: with this you can strip it down in order, inspect race surfaces, verify preload steps, then reassemble without leaving a shim out or mis‑routing a line.

Applications & Use Cases

• Plan a major teardown of boom, arm, or swing by laying out the bench, tagging hoses, and isolating what really needs to come off.
• Trace a hydraulic issue by checking sections in sequence, testing pressures at the right ports, and narrowing it down before you start bleeding the whole system.
• Verify torque sequences on key joints so you don’t warp housings or crush seals during reassembly.
• Inspect internal components—pins, bushings, gear teeth, pump internals—while they’re apart and decide what you’ll replace now versus monitor.
• Route harnesses and hoses correctly on reassembly, keeping clearances, clamp points, and alignment marks so it won’t chafe or bind later.

FAQ

Q: Is this a PDF I can search on my laptop or phone?

A: Yes, it’s typically a searchable PDF, so you can jump to sections and keywords instead of flipping pages.

Q: Can I print just the pages I need for a job?

A: Usually you can; most folks print the relevant procedures, stick them in a sleeve, and keep them at the machine.

Safety Note

Always lock out, support, and bleed down everything before you get under a raised attachment or crack open any hydraulic or fuel lines.

Develon DX255LC-7 Crawler Excavator Index:

• DX255LC-7
  • Safety, Specification and Systems Operation
    • Track Excavator Maintenance Safety
      • Safety Instructions
      • General
      • Long Term Storage
      • Maintenance
      • Environment and Circumstances
    • General Specifications
      • Safety Instructions
      • General
      • Standard Specification
      • Performance Tests
      • Preparation for Performance Tests
      • Operational Performance Standard Table
      • Operational Performance Test
    • Engine Specifications
      • Safety Instructions
      • Engine Specification
      • Engine Performance Curves
      • Tightening Torques
    • Hydraulic Systems and Structure Specifications
      • Safety Instructions
      • Hydraulic System
    • General Maintenance Instructions
      • Safety Instructions
      • Welding Precautions and Instructions
      • Hydraulic System – General Precautions
      • Maintenance Service and Repair Procedure
      • Hydraulic System Cleanliness and Oil Leaks
      • Cleaning and Inspection
    • Standard Torques
      • Safety Instructions
      • Torque Values for Standard Metric Fasteners
      • Torque Values for Standard U.S. Fasteners
      • Type 8 Phosphate Coated Hardware
      • Torque Values for Hose Clamps
      • ORFS Swivel Nut Recommended Torque
      • Torque Values for Split Flanges
      • Torque Wrench Extension Tools
      • Loctite Applications
    • Engine
      • Safety Instructions
      • Fuel System
      • Lubrication system
      • Electrical System
      • Electrical System for T4F engine
      • Exhaust System
      • Cooling System
      • After Treatment System
      • After Treatment System for T4F engine
    • Systems Operation, Description and Inspection
      • Safety Instructions
      • Overview – Components Layout
      • System Operations
    • Components Operation, Description and Inspection
      • Safety Instructions
      • Main Pump
      • Main Control Valve
    • Systems Operation and Description
      • Safety Instructions
      • Power Supply
      • Starting System
      • Charging System
      • AVM System
      • Gauge Panel System
      • EPOS system
      • Air Conditioner System
      • Refrigerant System Repairs
      • Troubleshooting
  • Removal and Installation
    • Engine
      • Safety Instructions
      • Before Removing and Installing
      • ECU (Engine Control Unit)
      • V-Belt
      • Alternator
      • Starter Motor
      • DEF (adblue®) Quality Sensor
      • Sensors – After Treatment
      • Engine Assembly
      • Engine Assembly for T4F engine
    • Hydraulic Systems and Structure
      • Safety Instructions
      • Before Removing and Installing
      • Main Pump
      • Main Pump for T4F engine
      • Drive Coupling
      • Undercovers
      • Hydraulic Oil Tank
      • Hydraulic Oil Tank for T4F engine
      • Fuel Tank
      • Swing Device
      • Joystick Valve(Work Lever)
      • Travel Control Valve
      • Center Joint
      • Center Joint for T4F engine
      • Track Guard
      • Travel Device
      • Travel Device for T4F engine
      • Main Control Valve
      • Cabin
      • Air Condenser Filter
    • Electric and Electronic
      • Safety Instructions
      • Before Removing and Installing
      • Battery Assembly
      • EPOS Controller
      • TMS Controller
      • AVM Controller
      • Microphone Controller
      • Smart Key Controller
      • DC-DC Controller
      • Cabin Photo Sensor
      • Cabin Switches
      • Around View Monitor
      • Display Monitor
      • Hour Meter
      • Wiper Motor
  • Troubleshooting Guide
    • Wiring Harness Layout
      • Safety Instructions
      • Wiring Device
      • Wiring Device for T4F engine
    • Error Code
      • Safety Instructions
      • EPOS Error Code
      • 1. Engine Fault Code List
  • Schematics
    • DX255LC-7 Hydraulic Schematic
    • DX255LC-7 Electric Schematic
    • Main Harness
    • Cabin Harness

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