Develon DX350LC-7K Crawler Excavator Shop Manual (950106-02869_D_EN)

On a DX350LC-7K, you’re usually in rock, demo, deep trench, or loading trucks all day, often in mud, dust, and cold starts. This shop manual is what you want when you’re past simple filters and need to tear down major components, trace a fault, and put it all back together without guessing. Say you’ve got slow boom lift and noisy hydraulics: this helps you plan the teardown, inspect the pump and main control valve while they’re apart, then reassemble and bleed the system so you don’t chase the same problem twice.

Applications & Use Cases

• Plan a big job: lay out tools, tag hoses, route harnesses, and mark components before you strip the upper or swing system.
• Trace hydraulic issues by isolating circuits, checking test ports, and following typical torque sequences on pump and valve removals.
• Inspect swing, travel, and final drives while opened up so you don’t miss worn shims, bearings, or misaligned gear sets.
• Rebuild boom, arm, and bucket cylinders, then verify seal orientation, rod alignment, and proper bleeding before you pin them back on.
• Pull and refit engine or cooling components, then test, align belts, and re-check for leaks once it’s up to temperature.

FAQ

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

A: Yes, it’s typically a searchable PDF, so you can jump to sections by keyword instead of scrolling forever.

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

A: You usually can; most techs print the procedures, stick them in a sleeve, and mark notes as they inspect and verify parts.

Safety Note

Always lock out the machine, support raised components mechanically, and bleed off hydraulic pressure before you crack any lines or start a teardown.

Develon DX350LC-7K Crawler Excavator Index:

• DX350LC-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
    • Elec and Electric Specifications
      • Safety Instructions
      • Electrical 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 and Exhaust System
      • Engine Control and Electrical System
      • After Treatment System
    • Systems Operation, Description and Inspection
      • Safety Instructions
      • General
      • Hydraulic Schematic
      • Hydraulic Component
    • Components Operation, Description and Inspection
      • Safety Instructions
      • Main Pump
      • Main Control Valve
      • Swing Device
      • Fan Pump
      • Fan Motor
      • Joystick Valve
      • Travel Control Valve
      • Solenoid Valve
      • EPPR Valve (By Pass Cut Valve)
      • EPPR and Solenoid Valve (Travel/Swing Operation)
      • Boom Floating Valve
      • Center Joint
      • Travel Device
      • Cylinder
    • 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
      • Main Pump
      • Drive Coupling
      • Undercovers
      • Hydraulic Oil Tank
      • Fuel Tank
      • Swing Device
      • Fan Pump
      • Fan Motor
      • Joystick Valve (Work Lever)
      • Travel Control Valve
      • Center Joint
      • Track Guard
      • Travel Device
      • Main Control Valve
      • 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
    • DX350LC-7K Hydraulic Schematic
    • DX350LC-7K Electric Schematic
    • Engine Harness
    • Main Harness
    • Cabin Harness

Develon