Specification sheet Wheel Loader Ref john-deere-644k-high-lift-wheel-loader
John Deere 644K High-Lift
The John Deere 644K High-Lift is a wheel loader with an operating weight of 40,798.75 lb (18,506 kg), a 232 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
40,798.75lb
18,506kg
Engine power
232hp
173.1kW
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 644K High-Lift sits at the heavy end of its class:
- Operating weight 40,800 lb heavier than 88% (n=439)
- Engine power 232 hp more powerful than 95% (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, Tier III certified | |
| Net Power | 232hp | 173.1kw |
| Power Measured @ | 1700rpm | |
| 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 | 40798.8lb | 18506kg |
|---|---|---|
| Fuel Capacity | 93gal | 352L |
| Hydraulic System Fluid Capacity | 29.1gal | 110L |
| Engine Oil Fluid Capacity | 6.5gal | 24.5L |
| Cooling System Fluid Capacity | 7.8gal | 29.5L |
| Transmission Fluid Capacity | 6.1gal | 23L |
| Front Axle/Diff Fluid Capacity | 5.9gal | 22L |
| Rear Axle/Diff Fluid Capacity | 5.9gal | 22L |
| Static Tipping Weight | 26958.2lb | 12228kg |
| Turning Radius | 18.3ft in | 5570mm |
| Operating Voltage | 24V | |
| Alternator Supplied Amperage | 80amps | |
| Rear Axle Oscillation | 26degrees | |
| Tire Size | 23.5 R25 |
03 Transmission Specification
| Transmission Type | Countershaft, powershift | |
|---|---|---|
| Number Of Forward Gears | 4 | |
| Number Of Reverse Gears | 3 | |
| Max Speed - Forward | 22.8mph | 36.6km/h |
| Max Speed - Reverse | 15.5mph | 24.9km/h |
04 Hydraulic System Specification
| Relief Valve Setting | 3650psi | 25165.9kPa |
|---|---|---|
| Pump Flow Capacity | 81.9gal/min | 310L/min |
| Raise Time | 5.5sec | |
| Dump Time | 1.4sec | |
| Lower Time | 3sec | |
| Pump Type | Variable axial piston |
05 Bucket Dimensions
| Dump Clearance At Max Raise | 10.77ft in | 3280mm |
|---|---|---|
| Bucket Capacity - Heaped | 4.25yd3 | 3.2m3 |
| Bucket Capacity - Struck | 3.7yd3 | 2.8m3 |
| Bucket Width | 9.98ft in | 3040mm |
| Breakout Force | 30384lb | 135.16kN |
06 Dimensions Dimensions
| Ground Clearance | 1.34ft in | 408mm |
|---|---|---|
| Length With Bucket On Ground | 28.25ft in | 8610mm |
| Width Over Tires | 9.43ft in | 2875mm |
| Height To Top Of Cab | 11.09ft in | 3380mm |
| Wheelbase | 10.7ft in | 3260mm |
| Hinge Pin - Max Height | 14.74ft in | 4490mm |
| 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.