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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 John Deere 644H, 644H MH 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 |
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 |
John Deere 644H, 644H MH Common Problems This Manual Covers
John Deere 644H loader settles from raised position with engine running, bucket drifts down under load
Check the circuit relief valves in the loader control valve before condemning cylinders. Cap the lift cylinder lines at the valve to isolate the leak path; if drift stops, repack the cylinders. If the valve section leaks, install a repair kit and torque the tie bolt nuts to 102 N•m (75 lb-ft) per page 456.
Manual Section: Loader p. 456Slow or jerky boom and bucket movement in cold weather, response improves after warm-up
Verify hydraulic oil level in the reservoir; the system holds 117 L (31 gal), noted on page 163. Warm the machine at low idle and cycle all functions before loading. If sluggish response continues after the oil warms, isolate each cylinder and watch for rod drift under load to find internal leakage.
Manual Section: Hydraulic Oil Clean-Up Procedure p. 163Loader lacks lift capacity and hydraulic pump whines under load, boom stalls with rated bucket
Test lift circuit relief pressure before pulling the pump; a stuck relief mimics a worn pump. Inspect the lift check for scoring, replace it if damaged, and torque the lift check hex head cap to 169 N•m (125 lb-ft) from page 456. If pressure still lags, remove the pump and inspect the rotating group and valve plate.
Manual Section: Hydraulic Pump Disassembly and Assembly p. 456Ride control not smoothing boom bounce during roading, front end pitches over rough ground
Test the accumulator nitrogen precharge after bleeding off the hydraulic charge. Recharge to 2068 ± 138 kPa (300 ± 20 psi), listed on page 459. If the accumulator will not hold precharge, replace the gas valve and piston seals during disassembly before condemning the ride control valve or plumbing.
Manual Section: Ride Control Accumulator Disassembly and Assembly p. 459Bucket rattles and slops at the bellcrank, pins and bushings knock during digging
Measure clearance between the bellcrank and bucket cylinder at full curl; anything past the 3 mm (0.12 in.) maximum shown on page 450 means worn pins and bushings. Remove the pins, inspect the bores for egging, and press in new bushings. Grease every loader pivot after assembly and recheck the clearance.
Manual Section: Loader p. 450Frequently Asked Questions
What are the torque specs for John Deere 644H wheel cooler bolts?
The manual provides torque specifications for "Cooler-to-Bottom Plate" and "Cooler-to-Grill Cap Screw" in the Cooling System section. The Cooler-to-Bottom Plate torque is 73 N•m (54 lb-ft), and the Cooler-to-Grill Cap Screw torque is 73 N•m (54 lb-ft). p. 289
What are the torque specs for John Deere 644H transmission mount bolts?
The torque specification for the Transmission Isolator Cap Screw is 433 N•m (320 lb-ft). For the Transmission Mounting Bracket-to-Transmission Cap Screw, it is 433 N•m (320 lb-ft) for the front and 318 N•m (235 lb-ft) for the rear. p. 167
What is the recommended replacement interval for the complete seat belt assembly on the John Deere 644H?
The complete seat belt assembly should be replaced after three years of usage, regardless of its appearance, to ensure safety. This is a critical safety measure for ROPS equipped machines. p. 17
What is the torque specification for the wheel retainer cap screws on the John Deere 644H?
The wheel retainer cap screws should be tightened to a torque of 620 N•m (460 lb-ft) when installing the wheel. This specification is for dry screws. p. 33
What is the approximate weight of the front axle and differential assembly for the John Deere 644H?
The approximate weight of the front axle and differential assembly is 885 kg (1950 lb). It is crucial to use a lifting device for heavy components during removal and installation. p. 41
What do I get after purchasing this John Deere 644H, 644H MH manual?
A 544-page Repair Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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