Specification sheet Wheel Loader Ref john-deere-644h-high-lift-wheel-loader
John Deere 644H High Lift
The John Deere 644H High Lift is a wheel loader with an operating weight of 39,000 lb (17,690 kg), a 180 hp engine, and a 4.25 yd³ (3.3 m³) bucket.
✓ QA-verified — every figure checked for unit consistency, physical possibility, and class plausibility; failures withheld → Operating weight
39,000lb
17,690kg
Engine power
180hp
134.3kW
Net Power Bucket capacity
4.25yd³
3.3m³
◆Where it sits in its classpercentile · small wheel loaders
Among 439 small wheel loaders (22,000–45,000 lb), the John Deere 644H High Lift sits above the median for its class:
- Operating weight 39,000 lb heavier than 80% (n=439)
- Engine power 180 hp more powerful than 65% (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 | 6081H | |
| Net Power | 180hp | 134.3kw |
| Gross Power | 205hp | 153kw |
| Power Measured @ | 2200rpm | |
| Max Torque | 745lb ft | 1010Nm |
| Displacement | 496cu in | 8.1L |
| Torque Measured @ | 1300rpm | |
| Aspiration | Turbocharged with Aftercooler |
02 Operational Specification
| Operating Weight | 39000lb | 17690kg |
|---|---|---|
| Fuel Capacity | 90gal | 341L |
| Hydraulic System Fluid Capacity | 31gal | 117L |
| Engine Oil Fluid Capacity | 6.7gal | 25L |
| Cooling System Fluid Capacity | 7.7gal | 29L |
| Transmission Fluid Capacity | 6.9gal | 26L |
| Front Axle/Diff Fluid Capacity | 7.2gal | 27L |
| Rear Axle/Diff Fluid Capacity | 7.2gal | 27L |
| Static Tipping Weight | 24798lb | 11248kg |
| Turning Radius | 18ft in | 5500mm |
| Operating Voltage | 24V | |
| Alternator Supplied Amperage | 55amps | |
| Rear Axle Oscillation | 26degrees | |
| Tire Size | 20.5-25 |
03 Transmission Specification
| Transmission Type | Power Shift | |
|---|---|---|
| Number Of Forward Gears | 4 | |
| Number Of Reverse Gears | 3 | |
| Max Speed - Forward | 24mph | 39km/h |
| Max Speed - Reverse | 16.4mph | 26.7km/h |
04 Hydraulic System Specification
| Relief Valve Setting | 3600psi | 24821.2kPa |
|---|---|---|
| Pump Flow Capacity | 68gal/min | 257.5L/min |
| Raise Time | 6.2sec | |
| Dump Time | 1.4sec | |
| Lower Time | 3sec | |
| Pump Type | Piston Pump |
05 Bucket Dimensions
| Dump Clearance At Max Raise | 11.08ft in | 3375mm |
|---|---|---|
| Bucket Capacity - Heaped | 4.25yd3 | 3.3m3 |
| Bucket Capacity - Struck | 3.7yd3 | 2.8m3 |
| Bucket Width | 9.52ft in | 2900mm |
| Breakout Force | 30574lb | 136kN |
06 Dimensions Dimensions
| Ground Clearance | 1.52ft in | 461mm |
|---|---|---|
| Length With Bucket On Ground | 28ft in | 8525mm |
| Width Over Tires | 8.85ft in | 2697mm |
| Height To Top Of Cab | 11.16ft in | 3400mm |
| Wheelbase | 10.5ft in | 3200mm |
| Hinge Pin - Max Height | 15ft in | 4569mm |
| Reach At Max Lift And Dump | 3.86ft in | 1175mm |
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.