John Deere 644K 4WD Loader Engine 6068HDW80, 6068HDW83 Repair Technical Manual (TM10695)

John Deere 644K 4WD Loader Engine 6068HDW80, 6068HDW83 Repair Technical Manual (TM10695 27JUN19)

This official repair technical manual offers complete service instructions, detailed disassembly and reassembly procedures, and comprehensive component overviews for the John Deere 644K 4WD Loader powered by 6068HDW80 (Tier 3) and 6068HDW83 (Stage II) engines. It includes axle, transmission, hydraulic, brake, HVAC, and loader systems – making it indispensable for professional service technicians and mechanical teams.

Model Covers:

644K 4WD Loader
Engine: 6068HDW80 (T3), 6068HDW83 (S2)
Serial Number: –642443

File Format: PDF

Size: 21.18 MB

No. of pages: 446

Language: English

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

📑 Included Sections:

General and Safety Information

• Machine hazard awareness, ROPS inspection, PPE, fire prevention
• Worksite operation guidelines, maintenance safety procedures
• Torque values and fitting service recommendations

Axles and Transmission

• TeamMate™ IV axle removal and rebuilds
• Torque converter disassembly, clutch packs K1–K4 repair
• Transmission hydraulic valve testing and component replacement

Engine and Cooling Systems

• PowerTech Plus™ 6.8L engine R&R for Tier 3 and Stage II
• Radiator, oil cooler, intercooler, fuel filter, and fast-fill systems
• Cold weather aids and serpentine belt maintenance

Hydraulic System

• Main hydraulic pump and valve teardown and install
• Loader cylinder servicing and relief valve repair
• Ride control, fan drive, pilot valve and accumulator diagnostics

Braking and Steering Systems

• Service brake pedal, linkage, and valve rebuilds
• Park brake solenoid and mechanical component repair
• Joystick and orbital valve steering system servicing

Operator Station and HVAC

• Cab removal, seat and belt installation, joystick adjustment
• Full air conditioning service including R134a charging and flushing
• Blower, heater valve, freeze switch and compressor maintenance

Loader Components and Frame

• Powerllel™ linkage, bellcrank, bucket, and boom cylinder servicing
• Pin joint maintenance, cracked edge repairs, NeverGrease™ components
• Loader frame disassembly and welding guidance

This John Deere 644K Repair Technical Manual is the definitive maintenance guide for in-depth servicing and restoration of major systems, ensuring peak loader reliability and long-term equipment durability.