John Deere
644A
Farm tractor · 1971–1973 · 141 hp
John Deere644A
The John Deere 644A is a farm tractor manufactured from 1971 to 1973. It features a John Deere engine, and articulated power steering. The transmission is a power shift type with 4 forward and 2 reverse.
Engine
| Engine | John Deere |
|---|---|
| Fuel Type | diesel |
| Cylinders | 6 |
| Cooling | liquid-cooled |
| Turbocharger Status | turbocharged diesel |
| Displacement | 404 ci (6.6 L) |
| Bore | 4.25 in (108 mm) |
| Stroke | 4.75 in (121 mm) |
| Compression Ratio | 16.5 |
| Power Gross | 141 hp (105.1 kW) |
| Power Net | 131 hp (97.7 kW) |
| Torque Peak | 345 lb-ft (467.8 Nm) |
| Torque Peak | 1,600 RPM |
| Starter Volts | 12 |
| Starter Type | electric |
| Oil Capacity | 17 qts (16.1 L) |
| Coolant Capacity | 36 qts (34.1 L) |
| Manufacturer | John Deere |
| Rated | 2,400 RPM |
Transmission
| Transmission Type | power shift |
|---|---|
| Gears | 4 forward and 2 reverse |
| Transmission Description | Power shift transmission with torque converter. Automatic shift from 1-2 and 3-4. |
| Available Options | 4-speed power shift |
Hydraulics
| Type | open center |
|---|---|
| Pump Flow | 60 gpm (227.1 lpm) |
| Pressure | 2,250 psi (155.1 bar) |
| Steering Flow | 27 gpm (102.2 lpm) |
Dimensions
| Length | 247.8 in (629 cm) |
|---|---|
| Height Cab | 127 in (322 cm) |
| Height Rops | 122 in (309 cm) |
| Wheelbase | 104 in (264 cm) |
| Ground Clearance | 15.9 in (40 cm) |
| Front Tread | 80 in (203 cm) |
| Rear Tread | 80 in (203 cm) |
Weight
| Weight | 26,472 lbs (12,007 kg) |
|---|---|
| Operating | 26,472 lbs (12,007 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 | 50 gal (189.2 L) |
|---|
Steering
| Type | articulated power |
|---|---|
| Pressure | 2,000 psi (137.9 bar) |
Cab
| Cab | standard with heat |
|---|