John Deere 644J Loader Repair Service Manual
TM10246 and TM10231
John Deere 644J 724j Operation Tests Technical Manual
Designed to maximize your productivity and uptime while minimizing your daily operating expenses, the 225-horsepower Deere 644J combines the muscle of a production machine with the flexibility and maneuverability of a utility loader.
Numerous enhancements within the more spacious cab include a multifunction state-of-the-art monitor, with advanced diagnostics, durable solid-state electrical distribution center, new sealed switch module, and improved ventilation.
Add to that a more efficient drivetrain and hydraulic cooling system with proportional fan control, and you’ve got a multipurpose machine that’ll make any operator and operation more productive.
Productivity never felt this comfortable.
John Deere 644J Repair Service Manual
Table of Contents
Repair Technical Manual- TM10246
Section 00—General Information
Group 0001—Safety Information
Group 0003—Torque Values
Section 01—Wheels
Group 0110—Powered Wheels And Fasteners
Section 02—Axles And Suspension Systems
Group 0200—Removal And Installation
Group 0225—Input Drive Shafts and U-Joints
Group 0250—Axle Shaft, Bearings, and Reduction Gears
Group 0260—Hydraulic System
Section 03—Transmission
Group 0300—Removal And Installation
Group 0350—Gears, Shafts, Bearings and Power Shift Clutch
Group 0360—Hydraulic System
Section 04—Engine
Group 0400—Removal and Installation
Section 05—Engine Auxiliary Systems
Group 0505—Cold Weather Starting Aids
Group 0510—Cooling System
Group 0520—Intake System
Group 0530—External Exhaust System
Group 0560—External Fuel Supply Systems
Section 07—Dampener Drive
Group 0752—Elements
Section 09—Steering System
Group 0960—Hydraulic System
Section 10—Service Brakes
Group 1011—Active Elements
Group 1060—Hydraulic System
Section 11—Park Brake
Group 1111—Active Elements
Group 1160—Hydraulic System
Section 17—Frame Or Supporting Structure
Group 1740—Frame Installation
Group 1746—Frame Bottom Guards
Group 1749—Chassis Weights
Section 18—Operator’s Station
Group 1800—Removal And Installation
Group 1810—Operator Enclosure
Group 1830—Heating And Air Conditioning
Section 19—Sheet Metal And Styling
Group 1910—Hood or Engine Enclosure
Group 1921—Grille and Fan Housing
Section 31—Loader
Group 3102—Bucket
Group 3140—Frames
Group 3160—Hydraulic System
Section 9900—Dealer Fabricated Tools
Group 0099—Dealer Fabricated Tools
Essential Maintenance Tips for John Deere 644J Loader Owners
- Regular Inspections: Conduct frequent visual inspections of the John Deere 644J loader to identify any signs of wear, damage, or leaks. Pay close attention to critical components such as the engine, hydraulic system, brakes, and tires.
- Fluid Checks: Monitor fluid levels regularly, including engine oil, hydraulic fluid, coolant, and brake fluid. Top up fluids as needed and ensure they are at the recommended levels to maintain optimal performance.
- Filter Maintenance: Replace air, fuel, oil, and hydraulic filters according to the manufacturer’s recommendations. Clean filters or replace them when they become clogged to prevent contaminants from entering the system.
- Lubrication Schedule: Follow the lubrication schedule outlined in the operator’s manual to grease all necessary lubrication points. Proper lubrication reduces friction, extends component lifespan, and ensures smooth operation.
- Tire Care: Inspect tires for wear, cuts, and punctures regularly. Maintain proper tire pressure to optimize traction, stability, and fuel efficiency. Rotate tires periodically to promote even wear and prolong tire life.
- Cooling System Maintenance: Keep the radiator and cooling system clean and free from debris to prevent overheating. Check hoses, belts, and the radiator core for leaks or damage and replace them as needed.
- Electrical System Check: Inspect wiring harnesses, connectors, and battery terminals for corrosion or damage. Test electrical components regularly to ensure they are functioning correctly, including lights, gauges, and warning indicators.
- Operator Training: Provide comprehensive training to operators on equipment operation, safety procedures, and maintenance tasks. Well-trained operators can detect issues early, operate equipment safely, and perform basic troubleshooting.
- Documentation: Maintain detailed records of all maintenance activities, including inspections, repairs, and parts replacements. Documenting maintenance tasks helps track the history of the loader and ensures timely servicing.
- Professional Service: For complex repairs or maintenance tasks beyond your expertise, rely on authorized John Deere service centers or trained technicians. Professional servicing ensures that repairs are done correctly and according to manufacturer standards.
