Allis Chalmers HD21
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| Production | |
| Manufacturer | Allis Chalmers |
| Agricultural Crawler tractor | |
| Built in Springfield, Illinois, USA | |
| Allis Chalmers HD21 Engine | |
| Allis-Chalmers 13.8L 6-cyl diesel | |
| Fuel tank | 135 gal 511.0 L |
 Engine details ... | |
| Allis Chalmers HD21 Transmission | |
| 2-speed torque converter | |
 Transmission details ... |
| Allis Chalmers HD21 Power | |
| Engine | 225 hp 167.8 kW |
| Drawbar (tested) | 135.12 hp 100.8 kW |
 Performance test details ... | |
| Mechanical | |
| Drive | crawler |
| Contracting band brakes | |
| Open operator station. | |
| Dimensions & Tracks | |
| Weight | 45500 lbs 20638 kg |
| Tracks | |
 Full dimensions and tracks ... | |
| HD21 Serial Numbers | |
| Location: | Steering clutch housing or instrument panel |
| References | |
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| Engineering-in-Action published in 1956, by Allis Chalmers |
| Page information | |
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| Peter Easterlund - owner/author | |
| Email: Peter@TractorData.com | |
| Updated on September 2, 2023 |