John Deere 644H and 644H MH Loader Repair Technical Manual (TM1638 15JAN04)

John Deere 644H and 644H MH Loader Repair Technical Manual (TM1638 15JAN04)

This official repair technical manual delivers complete servicing instructions, disassembly procedures, and reassembly guides for John Deere 644H and 644H MH wheel loaders. It provides detailed component overviews, troubleshooting steps, hydraulic and transmission repair procedures, and operator station maintenance. Tailored for service technicians and repair specialists, this manual is vital for maintaining and restoring loader performance to factory standards.

Model Covers:

John Deere 644H Loader
John Deere 644H MH Loader

File Format: PDF

Size: 14.00 MB

No. of pages: 544

Language: English

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

📑 Included Sections:

Safety and General Information

• Loader-specific safety protocols and rollover prevention
• Seat belt use, operator environment precautions, and fluid handling safety
• Machine inspection and safe service practices

Powertrain and Transmission

• Front/rear axle service and differential repair
• Torque converter and clutch pack disassembly and assembly
• Transmission hydraulic valve and pressure regulator maintenance

Hydraulic System

• Loader control valves and hydraulic pump overhaul
• Boom and bucket cylinder service and ride control diagnostics
• Relief valve and pilot controller repair procedures

Steering and Brake Systems

• Steering valve, column, and cylinder maintenance
• Brake valve and accumulator servicing
• Park brake solenoid valve and switch diagnostics

Engine and Auxiliary Systems

• Engine removal and CTM references for diagnostics
• Cooling system, exhaust, and intake servicing
• Cold weather starting aids and speed control linkage adjustment

Operator’s Station and HVAC

• Cab removal, windshield wiper adjustment, and air filters
• Air conditioning system recovery, charge, and leak testing
• Blower assembly, heater coil, and pressure switch servicing

For complete service information, also see:

644H and 644H MH Loader Operation and Test .......... TM1637
8.1L Engine Repair .......... CTM86
8.1L Engine Operation and Diagnostics .......... CTM134
Alternators and Starting Motors .......... CTM77
Electronic Fuel Injection Systems .......... CTM68

This John Deere 644H and 644H MH Loader Repair Manual is a complete technical guide for professional service technicians, ensuring accurate repair procedures, hydraulic and mechanical diagnostics, and optimized loader maintenance.