Develon DX300LC-7K Crawler Excavator Shop Manual (950106-02873_D_EN)

This DX300LC-7K usually lives in the dirt—pipe crews, quarry work, demo piles, loading trucks all day. This shop manual’s what you’d use when you’re past quick fixes and into major teardown territory: swing, final drives, boom foot, main pump, big hydraulic work. Say your swing motor’s howling and you’ve got metal in the oil; this is the book you’ll lean on to plan the strip-down, trace the fault, and get it all back together without extra “mystery parts” left on the bench.

Applications & Use Cases

• Plan your teardown so you can lay out parts, route hoses, and keep track of shims and spacers before the upper or undercarriage is scattered across the floor.
• Trace and isolate hydraulic issues, then bleed and test circuits properly after you’ve had lines, pumps, or cylinders apart.
• Follow general torque sequences so you don’t warp housings or misalign bearings when you reassemble finals, swing gearboxes, or boom pins.
• Inspect wear points while it’s open—bushings, pins, seals—so you don’t button it up and tear it back down a week later.
• Verify sensor locations and linkage alignment so controls feel right and the machine tracks straight when you’re done.

FAQ

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

A: Yeah, it’s typically a searchable PDF, so you can jump to sections and find systems by keyword.

Q: Can I print just a few pages to take out to the jobsite?

A: Usually you can print sections; most guys print the procedures they’re doing and stick them in a sleeve so they don’t get soaked in oil.

Safety Note

Always support and lock out the upper and attachments before you crawl under or crack any lines that could drop or swing unexpectedly.

Develon DX300LC-7K Crawler Excavator Index:

• DX300LC-7K
  • Safety, Specification and Systems Operation
    • Track Excavator Maintenance Safety
      • Safety Instructions
      • Safety Messages
      • 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
      • General Information
      • Mechanical System
      • Fuel System
      • Lubricating System
      • Cooling System
      • Intake/Exhaust System
      • Engine Control System
      • After Treatment System
    • Systems Operation, Description and Inspection
      • Safety Instructions
      • Overview – Components Layout
      • VBO Calibration Summary
    • Components Operation, Description and Inspection
      • Safety Instructions
      • Main Pump
      • Main Control Valve
      • Swing Device
      • Fan Pump
      • Fan Motor For Oil Cooler
      • Joystick Valve
      • Travel Control Valve
      • Solenoid Valve
      • Center Joint
      • Travel Device
    • Systems Operation and Description
      • Safety Instructions
      • General Schematics
      • 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
      • Sensors – Engine
      • Engine Assembly
    • Hydraulic Systems and Structure
      • Safety Instructions
      • Before Removing And Instralling
      • Drive Coupling
      • Undercovers
      • Joystick Valve (Work Lever)
      • Travel Control Valve
      • Main Control Valve
      • Main Pump
      • Hydraulic Oil Tank
      • Fuel Tank
      • Swing Device
      • Fan Pump
      • Fan Motor
      • Center Joint
      • Travel Device
      • Cabin
    • 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
    • Error Code
      • Safety Instructions
      • EPOS Error Code
      • Engine Error Code
  • Schematics
    • DX300LC-7K Hydraulic Schematic
    • DX300LC-7K Electric Schematic

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