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Part of the John Deere Repair Manuals.
Every one of the 762 pages in this John Deere 644-B Technical Manual PDF covers one machine: the 644-B wheel loader, from basic engine to loader boom. You get full wiring diagrams with component wire routing, hydraulic schematics for the steering, brake, and loader circuits, and a troubleshooting section built around John Deere's seven basic steps of diagnosis. Inside: torque tables, fluid capacities, and page after page of step-by-step teardown procedures for the transmission, differential, and final drives. When you rebuild the steering valve, torque the cap screws to 35 lb-ft (47 Nm) and remember a full turn of the adjusting screw moves it 0.036 in. (0.9 mm). No more chasing wiring faults with a multimeter and a prayer. Bookmarked with a working text layer; search any spec, jump to any section, and get back on the loader.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 4-48 | Maintenance Without Accident, Complete Page Listing, Predelivery, Delivery, And After-Sale Services |
| Engine | 49-168 | Basic Engine, Connecting Rods and Pistons, Cylinder Block and Cylinder Liners, Crankshaft and Main Bearings, Engine Lubrication System, Engine Cooling System, Fuel System |
| Electrical System | 169-266 | Batteries, Delco Remy Alternator, Motorola Alternator, Delco Remy Starting System, John Deere Starting System, Miscellaneous Electrical Components, Heating and Air Conditioning |
| Power Train | 267-392 | Drive Shafts, Transmission, Turbine Driven Gears and Freewheel Clutch, Output Components and Transfer Driven Gear, Parking Brake and Front Output Flange |
| Hydraulic System | 393-528 | Transmission Pump, Transmission Control Valve, Steering and Brake Pump, Steering Valve, Steering Valve Operation, Brake Valve, Loader Pump |
| Miscellaneous Components | 529-564 | Loader and Engine Frames, Loader Boom and Buckets, Lumber Fork, Canopy and Cabs, Specifications and Special Tools |
| System Testing - Engine and Electrical | 565-629 | Seven Basic Steps of Diagnosis, Visual Inspection, Fuel and Compression Tests, Engine Diagnosis, Starting and Charging Circuit Tests, Return-to-Dig and Boom Raise Circuits, Control Lever Faults |
| System Testing - Heating and Air Conditioning | 630-649 | Air Conditioning Operation and Diagnosis, Refrigerant Charging, Heater and Blower Tests, Compressor and Condenser Checks |
| System Testing - Power Train and Differential | 650-662 | Transmission Diagnosis, Clutch Pressure Tests, Torque Converter Checks, Differential Testing |
| System Testing - Hydraulic, Steering and Brake Systems | 663-732 | Hydraulic System Diagnosis, Steering Valve Tests, Brake System Tests, Loader Hydraulic Tests, Hydraulic System Analyzer, Test Pattern Analysis Chart, Transmission Pump Test |
| System Testing - Specifications and Adjustments | 733-754 | Engine Test Specifications, Hydraulic Pressure Specifications, Heating and Air Conditioning Specifications, Final Adjustments |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic oil lines | broken | p. 423 |
| Tighten cap screws | 35 lb-ft (47 Nm) | p. 439 |
| Adjusting screw moves the screw | 0.036 in. (0.9 mm) | p. 438 |
| Every 10 degrees of turn will give a change | 0.001 in. (0.025 mm) | p. 438 |
| Adjust double ball joint (20) (center ball to center ball with studs indexed 180° from each other) | 2.875 in. [73.02 mm] | p. 476 |
| Install washer (30) on stud and tighten | 30 ± 3 lb-ft (41 ± 4 Nm) (4 ± 0.4 kg-m) | p. 476 |
| Battery Cold Cranking Amps (4D) | 800 | p. 251 |
| Engine oil pressure at 1900 rpm | 40 to 50 psi | p. 733 |
