| Production | |
| Manufacturer | Allis Chalmers |
| Row-Crop tractor | |
| Built in West Allis, Wisconsin, USA | |
| Total built | 1,129 |
| Original price was $5,700 in 1964 | |
| The D21 was the first Allis Chalmers tractor to have over 100 horsepower. The upgraded D21 II began at serial number 2201 in 1965. | |
| Allis Chalmers D21 Engine | |
| Allis Chalmers 7.0L 6-cyl diesel | |
| Fuel tank | 52 gal 196.8 L |
| Allis Chalmers D21 Transmission | |
| 8-speed sliding gear | |
| Allis Chalmers D21 Power | |
| Engine | 119 hp 88.7 kW |
| Drawbar (claimed) | 93 hp 69.4 kW |
| PTO (claimed) | 103 hp 76.8 kW |
| Plows | 7 |
| Drawbar (tested) | 93.09 hp 69.4 kW |
| PTO (tested) | 103.06 hp 76.9 kW |
| Mechanical | |
| Two-wheel drive | |
| Power steering | |
| Band actuated disc brakes | |
| Open operator station. |
| Photos | |
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| Tractor hitch | |
| Rear Type | III/II |
| Power Take-off (PTO) | |
| Rear PTO | independent |
| Rear PTO Type | 1000 |
| Dimensions & Tires | |
| Wheelbase | 96.1 inches 244 cm |
| Weight | 9500 lbs 4309 kg |
| Front tire | 7.50x20 |
| Rear tire | 18.4x34 |
| D21 Serial Numbers | |
| Location: | Serial number on the left side of the Allis-Chalmers D21, stamped into the flange near the starter mounting. |
| 1963 | 100 (Series I) |
| 1964 | 1417 (Series I) |
| 1965 | 2079 (Series I) |
| Final | 2129 (Series I) |
| 1965 | 2130 (Series II) |
| 1966 | 2408 (Series II) |
| 1967 | 2863 (Series II) |
| 1968 | 3777 (Series II) |
| 1969 | 4498 (Series II) |
| Final | 4609 (Series II) |
FAQ: How to read a serial number table. | |
| Electrical | |
| Ground | negative |
| Charging system | Delco-Remy generator |
| Charging amps | 32 |
| Batteries | 2 |
|   | 4 OptOptional |
| Battery volts | 12 |
| Battery AH | 95 |
| References | |
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| New D21 Tractor (FE-131/637) published in 1963 | |
| Operating Instructions Model D21 Tractor (TM-346A) published in 1963 |
| Page information | |
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| TractorData is a family-owned small business located in Minnesota that has been providing reference information on tractors since 1999. | |
| Peter Easterlund - owner/author | |
| Email: Peter@TractorData.com | |
| Updated on September 18, 2022 |