John Deere 644J Z-Bar Wheel Loader
Wheel Loader // John Deere
John Deere 644J Z-Bar Bucket
| Breakout Force: | 34407 lbs (15,607 kg) |
| Bucket Capacity - heaped: | 4.3 cu yds (3 m) |
| Bucket Capacity - struck: | 3.7 cu yds (3 m) |
| Bucket Width: | 9.5 ft (3 m) |
John Deere 644J Z-Bar Dimensions
| Dump Clearance at Max Raise: | 9.7 ft (3 m) |
| Ground Clearance: | 1.5 ft (0 m) |
| Height - Top of Cab: | 11.2 ft (3 m) |
| Hinge Pin - Max Height: | 13.6 ft (4 m) |
| Length with Bucket on Ground: | 26.5 ft (8 m) |
| Reach at Max Lift and Dump: | 3.7 ft (1 m) |
| Wheelbase: | 10.5 ft (3 m) |
| Width Over Tires: | 9.5 ft (3 m) |
John Deere 644J Z-Bar Engine
| Aspiration: | Turbocharged charge air cooled |
| Displacement: | 414 cu in (0 m) |
| Engine Model: | 6068H |
| Net Power: | 185 hp (138 kw) |
| Number of Cylinders: | 6.0 |
| Power Measured @: | 2200 rpm |
| Torque Measured @: | 1400 rpm |
| Torque Rise: | 0.55 |
John Deere 644J Z-Bar Hydraulic System
| Dump Time: | 1.4 sec |
| Lower Time: | 3 sec |
| Pump Flow Capacity: | 68 gal/min (257 l/min) |
| Pump Type: | Variable axial piston |
| Raise Time: | 6.2 sec |
| Relief Valve Setting: | 3600 psi |
John Deere 644J Z-Bar Operating Specifications
| Alternator Supplied Amperage: | 80 A |
| Cooling System Fluid Capacity: | 7.8 gal (30 l) |
| Engine Oil Fluid Capacity: | 6.5 gal (25 l) |
| Front Axle/Diff Fluid Capacity: | 5.9 gal (22 l) |
| Fuel Capacity: | 93 gal (352 l) |
| Hydraulic System Fluid Capacity: | 31 gal (117 l) |
| Operating Voltage: | 24 V V |
| Operating Weight: | 40150 lbs (18,212 kg) |
| Rear Axle Oscillation: | 26 ° |
| Rear Axle/Diff Fluid Capacity: | 5.9 gal (22 l) |
| Static Tipping Weight: | 34379 lbs (15,594 kg) |
| Tire Size: | 23.5 R25 |
| Transmission Fluid Capacity: | 18 ft (5 m) |
| Turning Radius: | 7.1 gal (27 l) |
| Max Speed - Forward: | 18 ft (5 m) |
John Deere 644J Z-Bar Transmission
| Max Speed - Reverse: | 22 mph (35 kph) |
| Number of Forward Gears: | 15.5 mph (25 kph) |
| Number of Reverse Gears: | 4.0 |
| Transmission Type: | 3.0 |
