John Deere
644B
Farm tractor · 1974–1980 · 160 hp
John Deere644B
The John Deere 644B is a farm tractor manufactured from 1974 to 1980. It features a 160 hp engine, and four-post with canopy steering. The transmission is a power shift type with 4 forward and 2 reverse.
Engine
| Fuel Type | diesel |
|---|---|
| Cylinders | 6 |
| Cooling | liquid-cooled |
| Turbocharger Status | turbocharged intercooled diesel |
| Displacement | 531 ci (8.7 L) |
| Bore | 4.75 in (121 mm) |
| Stroke | 5 in (127 mm) |
| Power Gross | 160 hp (119.3 kW) |
| Power Net | 145 hp (108.1 kW) |
| Torque Peak | 432 lb-ft (585.8 Nm) |
| Torque Peak | 1,500 RPM |
| Air Cleaner | dry |
| Starter Volts | 12 |
| Starter Type | electric |
| Oil Capacity | 24 qts (22.7 L) |
| Coolant Capacity | 49 qts (46.4 L) |
| Manufacturer | John Deere |
| Rated | 2,200 RPM |
Transmission
| Transmission Type | power shift |
|---|---|
| Gears | 4 forward and 2 reverse |
| Available Options | 4-speed power shift |
Hydraulics
| Type | open center |
|---|---|
| Pump Flow | 62.5 gpm (236.6 lpm) |
| Pressure | 2,250 psi (155.1 bar) |
| Steering Flow | 26.5 gpm (100.3 lpm) |
Electrical
| Battery Volts | 12 |
|---|---|
| Charging System | alternator |
Dimensions
| Length | 254.3 in (645 cm) |
|---|---|
| Height Cab | 127 in (322 cm) |
| Height Rops | 121 in (307 cm) |
| Wheelbase | 104 in (264 cm) |
| Ground Clearance | 17.2 in (43 cm) |
| Front Tread | 80 in (203 cm) |
| Rear Tread | 80 in (203 cm) |
Weight
| Weight | 28,100 lbs (12,746 kg) |
|---|---|
| Operating | 28,100 lbs (12,746 kg) |
Tires & Tracks
| Front Ag | 20.5-25 |
|---|---|
| Rear Ag | 20.5-25 |
| Front Industrial | 20.5-25, 17.5-25 |
| Rear Industrial | 20.5-25, 17.5-25 |
Fuel
| Capacity | 56 gal (212 L) |
|---|
Steering
| Type | four-post with canopy |
|---|---|
| Pressure | 2,350 psi (162 bar) |
Cab
| Cab | optional |
|---|