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| info | |
| 1954 - 1965, Model years 1954-19581958-1965, Agricultural Crawler tractor |
| Production | |
| Manufacturer: | Allis Chalmers |
| Factory: | Springfield, Illinois, USA |
| Capacity | |
| Fuel: | 135 gal [511.0 L] |
| Dimensions & Tires | |
| Weight: | 45500 lbs [20638 kg] |
| Front tire: | tracks |
| Rear tire: | tracks |
| HD21 Serial Numbers | |
| Location: | Steering clutch housing or instrument panel |
| - Serial numbers unknown - | |
| 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. |
| Battery | |
| Number: | 2 |
| Volts: | 12 |
| info | |
| 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] |
| Engine Detail | |
| Allis-Chalmers, supercharged diesel, 6-cylinder, liquid-cooled vertical I-head, 844 ci [13.8 L] |
| Transmission | |
| Type: | torque converter |
| Gears: | 2 forward and 1 reverse |
| Dimensions | |
| Weight: | 45500 lbs [20638 kg] |
| Length: | 198 inches [502 cm] |
| Height: | 99 inches [251 cm] |
| Allis Chalmers HD21 Tires | |
| Ag front: | tracks |
| Ag rear: | tracks |