Part of the John Deere Repair Manuals.
Looking for a John Deere 644H repair manual PDF you can actually trust? This 544-page factory manual (OEM TM1638) covers the 644H and 644H MH wheel loaders bolt by bolt. Inside: hydraulic schematics for the axle, transmission, steering, and brake circuits, plus page after page of torque tables and exploded views showing exactly how the power shift clutch stacks together. You get full removal and installation procedures for the engine, transmission, axles, and operator's station, along with troubleshooting for leaks and shift problems. Torque the input shaft-to-drive plate screws to 115 N-m (85 lb-ft) and the converter top cover to 46 N-m (34 lb-ft); the numbers are right there in black and white. No more chasing specs through forum threads. Bookmarked and text-searchable; pull it up on your phone at the machine and get back to work.
What's Inside This Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 9-30 | Safety Information |
| Wheels | 31-36 | Powered Wheels and Fasteners |
| Axles and Suspension Systems | 37-160 | Removal and Installation, Axle Shafts and U-Joints, Axle Shaft, Bearings, Reduction Gears, Hydraulic System |
| Transmission | 161-254 | Removal and Installation, Gears, Shafts, Bearings and Power Shift Clutch, Hydraulic System, Dealer Fabricated Tools |
| Engine | 255-266 | Removal and Installation |
| Engine Auxiliary Systems | 267-316 | Cold Weather Starting Aids, Cooling System, Speed Controls, Intake System, External Exhaust System, External Fuel Supply Systems |
| Dampener Drive | 317-320 | Elements |
| Steering System | 321-332 | Hydraulic System |
| Service Brakes | 333-344 | Wet Disc Service Brakes, Brake Valve and Accumulators, Brake Pedal Linkage, Bleeding and Pressure Tests |
| Park Brake | 345-358 | Park Brake Disc and Caliper, Park Brake Control Valve and Solenoid, Release Procedure, Adjustment and Bleeding |
| Frame or Supporting Structure | 359-376 | Frame Installation, Frame Bottom Guards, Chassis Weights |
| Operator's Station | 377-428 | Removal and Installation, Operator Enclosure, Heating and Air Conditioning, Dealer Fabricated Tools |
| Sheet Metal and Styling | 429-438 | Hood or Engine Enclosure, Grille and Grille Housing |
| Loader | 439-544 | Loader Boom and Bucket, Loader Frames, Lift and Tilt Cylinders, Loader Hydraulic Circuit and Valves, Quick-Coupler, Dealer Fabricated Tools |
Documents This Manual Refers To
The manufacturer cites these publications by number. We carry them:
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic System | Group 0260 | p. 5 |
| High pressure washing | greater than 1379 kpa (13.8 bar) (200 psi) | p. 28 |
| Input Shaft-to-Drive Plate (M12/10.9) Hex Head Screw-Torque | 115 N·m (85 lb-ft) | p. 171 |
| Input Shaft Plate Assembly-to-Converter (M12/10.9) Hex Head Screw-Torque | 115 N·m (85 lb-ft) | p. 171 |
| Manifold Plate-to-Transmission Housing Socket Head Screw-Torque | 25 N•m (18 lb-ft) | p. 233 |
| Control Valve-to-Manifold Plate Socket Head Screw-Torque | 9.5 N•m (85 lb-in) | p. 236 |
| Hydraulic Reservoir Capacity | 117 L (31 gal) approximate | p. 324 |
| Bellcrank-to-Bucket Cylinder-Clearance | 3 mm (0.12 in.) maximum | p. 450 |
| Wheel Retainer Cap Screws Torque | 620 N•m (460 lb-ft) | p. 33 |
| Axle and Differential Oil Capacity | 27 L (29 qt) | p. 39 |
| Axle and Differential Weight | 885 kg (1950 lb) | p. 41 |
| Axle Housing Retaining Nut Rolling Drag Torque | 30—38 N•m (22—28 lb-ft) | p. 63 |
