Production | |
| Manufacturer: | Allis Chalmers |
| Type: | Agricultural Crawler tractor |
| Factory: | Springfield, Illinois, USA |
Allis Chalmers HD21 Power | |
| Engine: | 225 hp 167.8 kW |
| Drawbar (tested): | 135.12 hp 100.8 kW |
Mechanical | |
| Chassis: | crawler |
| Brakes: | contracting band |
| Cab: | Open operator station. |
| Transmission: | 2-speed torque converter |
HD21 Serial Numbers | |
| Location: | Steering clutch housing or instrument panel |
Engine Detail | |
| Allis-Chalmers | |
| supercharged diesel | |
| 6-cylinder | |
| liquid-cooled vertical I-head | |
| Displacement: | 844 ci 13.8 L |
| Bore/Stroke: | 5.25x6.50 inches 133 x 165 mm |
| Power: | 225 hp 167.8 kW |
| Air cleaner: | oil bath |
| Compression: | 13.3:1 |
| Rated RPM: | 1800 |
| Starter volts: | 24 |
| Coolant capacity: | 80 qts 75.7 L |
Transmission | |
| Type: | torque converter |
| Gears: | 2 forward and 1 reverse |
Dimensions | |
| Length: | 198 inches 502 cm |
| Height: | 99 inches 251 cm |
| Weight: | 45500 lbs 20638 kg |