Specification sheet Wheel Loader Ref john-deere-644k-wheel-loader
John Deere 644K
The John Deere 644K is a wheel loader with an operating weight of 41,186.76 lb (18,682 kg).
✓ QA-verified — every figure checked for unit consistency, physical possibility, and class plausibility; failures withheld → Operating weight
41,186.76lb
18,682kg
◆Where it sits in its classpercentile · small wheel loaders
Among 439 small wheel loaders (22,000–45,000 lb), the John Deere 644K sits at the heavy end of its class:
- Operating weight 41,190 lb heavier than 89% (n=439)
Not positioned on engine power, bucket capacity — withheld or unpublished for this machine.
01 Engine Specification
| Pump | Piston | |
|---|---|---|
| Engine Output-Net | 232hp | 173kw |
| Transmission Type | Powershift | |
| Engine Make | John Deere | |
| Engine Model | PowerTech PSS 6090 | |
| Torque | 783.3lb ft | 1062Nm |
| Rated Speed | 1700rpm | |
| Displacement | 549.3cu in | 9L |
| Torque Rise | 56% | |
| System Voltage | 24V | |
| Emission Level | Tier 4 | |
| Alternator | 130amps |
02 Driveline Specification
| Ride Control System | Optional | |
|---|---|---|
| Service Brake Type | Wet Disc | |
| Parking Brake Type | Wet Multi Disc - Transmission | |
| Differential Lock | Front- Locking, Rear- Open | |
| Service Brake Actuation | Hydraulic | |
| Tire Size - Standard | 23.5 R25 | |
| Service Brake - Location | Axle Inboard |
03 Capacities Specification
| Hydraulic Tank | 27.8gal | 105.2L |
|---|---|---|
| Heaped Capacity | 4.2yd3 | 3.2m3 |
| Transmission | 6.1gal | 23L |
04 Operational Specification
| Operating Weight | 41186.8lb | 18682kg |
|---|---|---|
| Fuel Capacity | 104.9gal | 397L |
| Front Axle/Diff Fluid Capacity | 5.9gal | 22L |
| Rear Axle/Diff Fluid Capacity | 5.9gal | 22L |
05 Transmission Specification
| Pump Flow | 78.5gal/min | 297L/min |
|---|---|---|
| System Pressure | 251.7psi | 1735.2kPa |
06 Bucket Dimensions
| Breakout - Bucket | 15378 (33903) kgf (lbf) | |
|---|---|---|
| Bucket Capacity - Smallest | 4.06yd3 | 3.1m3 |
| Largest Bucket Capacity | 4.19yd3 | 3.2m3 |
07 Dimensions Dimensions
| Ground Clearance | 18.15in | 461mm |
|---|---|---|
| Length With Bucket On Ground | 27.24ft in | 8300mm |
| Width Over Tires | 9.44ft in | 2875mm |
| Wheelbase | 10.7ft in | 3260mm |
| Hinge Pin - Max Height | 13.52ft in | 4120mm |
| Reach At Max Lift And Dump | 5.29ft in | 1610mm |
| Turning Circle | 43.57ft in | 13280mm |
| Height Over Cab | 11.26ft in | 3430mm |
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.