Specification sheet Wheel Loader Ref john-deere-644j-z-bar-wheel-loader
John Deere 644J Z-Bar
The John Deere 644J Z-Bar is a wheel loader with an operating weight of 40,150 lb (18,212 kg), a 185 hp engine, and a 4.25 yd³ (3.2 m³) bucket.
✓ QA-verified — every figure checked for unit consistency, physical possibility, and class plausibility; failures withheld → Operating weight
40,150lb
18,212kg
Engine power
185hp
138kW
Net Power Bucket capacity
4.25yd³
3.2m³
◆Where it sits in its classpercentile · small wheel loaders
Among 439 small wheel loaders (22,000–45,000 lb), the John Deere 644J Z-Bar sits above the median for its class:
- Operating weight 40,150 lb heavier than 85% (n=439)
- Engine power 185 hp more powerful than 67% (n=408)
- Bucket capacity 4.3 yd³ larger-bucket than 85% (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 | 40150lb | 18212kg |
|---|---|---|
| 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 | 34379lb | 15594kg |
| Turning Radius | 18ft in | 5490mm |
| Operating Voltage | 24V | |
| Alternator Supplied Amperage | 80amps | |
| Rear Axle Oscillation | 26degrees | |
| 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 | 6.2sec | |
| Dump Time | 1.4sec | |
| Lower Time | 3sec | |
| Pump Type | Variable axial piston |
05 Bucket Dimensions
| Dump Clearance At Max Raise | 9.67ft in | 2950mm |
|---|---|---|
| Bucket Capacity - Heaped | 4.25yd3 | 3.2m3 |
| Bucket Capacity - Struck | 3.7yd3 | 2.8m3 |
| Bucket Width | 9.5ft in | 2895.6mm |
| Breakout Force | 34407lb | 153kN |
06 Dimensions Dimensions
| Ground Clearance | 1.42ft in | 434mm |
|---|---|---|
| Length With Bucket On Ground | 26.42ft in | 8050mm |
| Width Over Tires | 9.43ft in | 2875mm |
| Height To Top Of Cab | 11.17ft in | 3400mm |
| Wheelbase | 10.5ft in | 3200mm |
| Hinge Pin - Max Height | 13.58ft in | 4140mm |
| Reach At Max Lift And Dump | 3.67ft in | 1120mm |
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.