John Deere 644J Loader Operation and Test Technical Manual (TM10231)

John Deere 644J Loader Operation and Test Technical Manual (TM10231 14JAN08)

This highly detailed technical manual covers all operational procedures, diagnostics, and testing instructions for the John Deere 644J Loader. Designed specifically for advanced service technicians, it includes step-by-step guides for system troubleshooting, performance evaluations, and controller diagnostics with in-depth focus on CAN networks, powertrain components, hydraulic operations, and HVAC systems.

Model Covers:

John Deere 644J Loader

File Format: PDF

Size: 20.71 MB

No. of pages: 1088

Language: English

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Included Sections:

Safety and General Information

• Comprehensive safety procedures and machine inspection protocols
• Hazard prevention, rollover protection, and emergency readiness
• Welding, chemical, and explosive safety measures

Diagnostic Trouble Codes (DTC)

• Complete DTC listings for CMU, ECU, TCU, FLC, and SSM controllers
• Fault isolation and repair procedures for electrical, hydraulic, and drive systems
• Sensor, solenoid, communication, and calibration fault guides

Operational Checkout and Engine Systems

• Operational test sequences for all control states (engine off/on)
• PowerTech Plus™ 6.8L (6068) engine diagnostics and theory
• Engine speed check, cooling, fuel, and air intake system inspections

Electrical System and CAN Network

• Wiring diagrams, component locations, and functional schematics
• CAN bus architecture: CMU, FLC, TCU, ECU, and SSM theory and diagnostics
• JDLink™ and GlobalTRACS® connectivity and service tools

Powertrain and Transmission

• TEAMMATE™ axles and torque converter operation
• Transmission pressure tests, clutch calibration, and stall diagnostics
• Differential lock and park brake fault diagnostics

Hydraulic System

• Hydraulic system theory, valve operation, and loader control flow
• Relief valve, accumulator, pilot control, and load sense adjustments
• Drift, leakage, overheating, and steering fault tests

Heating and Air Conditioning

• Cycle of operation, refrigerant handling, and oil charge procedures
• Freeze switch, high/low pressure, and leak testing diagnostics
• Cab comfort system fault analysis for heating and cooling issues

This John Deere 644J Loader Operation and Test Technical Manual is the go-to reference for diagnostics, calibration, and testing – delivering advanced troubleshooting support for professional service environments.