John Deere 644-B Loader Technical Manual TM1095

What's Covered in This Manual

This is the official John Deere TM1095 Technical Manual for the 644-B Loader, published in August 1978. This classic-era wheel loader manual is organized the way John Deere structured its technical manuals in this period, with full repair procedures covering the engine, power train, hydraulics, electrical system, and steering.

Inside, the manual provides complete removal, disassembly, inspection, repair, and reassembly procedures for the major systems on this loader, along with the specifications, wear tolerances, and torque values needed to bring a rebuild back within factory spec. Given the loader's articulated steering and hydraulic lift and tilt functions, the hydraulics section is especially thorough, covering the pumps, valves, cylinders, and the loader control circuits that handle bucket and boom operation.

The 644-B model designation is confirmed present throughout the manual text, consistently referenced as "JD644-B" or "644-B" across the document. Whether you're rebuilding the hydraulic system, servicing the driveline, or doing a full engine overhaul on a 644-B, this manual provides the complete factory repair procedures needed for the job.

Because this manual dates to 1978, it documents the loader exactly as it was built at the factory, without any of the simplifications or omissions that sometimes creep into aftermarket reprints of older equipment manuals. For an owner or shop keeping a 644-B running decades after it left the factory floor, having the original torque specs and wear tolerances on hand is often the difference between a repair that holds up and one that doesn't.

Table of Contents

• Introduction - General information, safety
• Engine - Removal, disassembly, repair procedures
• Power Train - Transmission and driveline repair
• Hydraulics - Pumps, valves, cylinders, loader lift/tilt circuits
• Electrical - Wiring and component service
• Steering - Articulated steering service and repair