Specification sheet Wheel Loader Ref john-deere-644j-high-lift-wheel-loader
John Deere 644J High-lift
The John Deere 644J High-lift is a wheel loader with an operating weight of 40,620 lb (18,425 kg), a 185 hp engine, and a 4 yd³ (3 m³) bucket.
✓ QA-verified — every figure checked for unit consistency, physical possibility, and class plausibility; failures withheld → Operating weight
40,620lb
18,425kg
Engine power
185hp
138kW
Net Power Bucket capacity
4yd³
3m³
◆Where it sits in its classpercentile · small wheel loaders
Among 439 small wheel loaders (22,000–45,000 lb), the John Deere 644J High-lift sits at the heavy end of its class:
- Operating weight 40,620 lb heavier than 86% (n=439)
- Engine power 185 hp more powerful than 67% (n=408)
- Bucket capacity 4 yd³ larger-bucket than 77% (n=387)
◇Scale drawingdrawn to scale · mm
01 Engine Specification
| Number Of Cylinders | 6 | |
|---|---|---|
| Engine Make | 2240 | |
| Engine Model | 6068H | |
| Net Power | 185hp | 138kw |
| Power Measured @ | 2200rpm | |
| Max Torque | 749lb ft | 1016Nm |
| Displacement | 414cu in | 6.8L |
| Torque Measured @ | 1400rpm | |
| Aspiration | Turbocharged charge air cooled | |
| Torque Rise | 55% |
02 Operational Specification
| Operating Weight | 40620lb | 18425kg |
|---|---|---|
| Fuel Capacity | 93gal | 352L |
| Hydraulic System Fluid Capacity | 31gal | 117L |
| Engine Oil Fluid Capacity | 6.5gal | 24.5L |
| Cooling System Fluid Capacity | 7.8gal | 29.5L |
| Transmission Fluid Capacity | 7.1gal | 26.5L |
| Front Axle/Diff Fluid Capacity | 5.9gal | 22L |
| Rear Axle/Diff Fluid Capacity | 5.9gal | 22L |
| Static Tipping Weight | 27689lb | 12560kg |
| Operating Voltage | 24V | |
| Alternator Supplied Amperage | 80amps | |
| Rear Axle Oscillation | 24degrees | |
| Tire Size | 23.5 R25 |
03 Transmission Specification
| Transmission Type | Automatic Powershift | |
|---|---|---|
| Number Of Forward Gears | 4 | |
| Number Of Reverse Gears | 3 | |
| Max Speed - Forward | 22mph | 35.4km/h |
| Max Speed - Reverse | 15.5mph | 25km/h |
04 Hydraulic System Specification
| Relief Valve Setting | 3600psi | 24800kPa |
|---|---|---|
| Pump Flow Capacity | 68gal/min | 257L/min |
| Raise Time | 5.9sec | |
| Dump Time | 1.9sec | |
| Lower Time | 2.8sec | |
| Pump Type | Variable axial piston |
05 Bucket Dimensions
| Dump Clearance At Max Raise | 11.08ft in | 3380mm |
|---|---|---|
| Bucket Capacity - Heaped | 4yd3 | 3m3 |
| Bucket Width | 9.75ft in | 2971.8mm |
| Breakout Force | 30574lb | 136kN |
06 Dimensions Dimensions
| Ground Clearance | 1.5ft in | 460mm |
|---|---|---|
| Length With Bucket On Ground | 28ft in | 8530mm |
| Height To Top Of Cab | 11.17ft in | 3400mm |
| Wheelbase | 10.5ft in | 3200mm |
| Hinge Pin - Max Height | 15ft in | 4570mm |
| Reach At Max Lift And Dump | 3.83ft in | 1170mm |
Method. Figures are manufacturer reference specifications, not measurements. Every value is checked for unit consistency, physically possible magnitude, and plausibility for its equipment class before publication; figures that fail any check are withheld rather than shown, and figures reconstructed from related data are marked above. Imperial and metric figures are reproduced as published, except where a note states otherwise.