Allis-Chalmers HD21 Specs ( 1954-1965 )
Overview
The Allis-Chalmers HD21 is an agricultural crawler tractor manufactured in Springfield, Illinois, between 1954 and 1965. It features a supercharged 13.8L 6-cylinder diesel engine rated at 225 hp and a torque converter transmission with two forward gears.
Ideal Applications
Tested Drawbar Performance:
During Nebraska Tractor Test 550, the unit achieved a maximum drawbar power of 135.12 hp and a maximum pull of 40,563 lbs.
Engine and Fuel Configuration:
The liquid-cooled vertical I-head engine utilizes an oil bath air cleaner and is supported by a 135-gallon fuel tank and an 80-quart coolant capacity.
Physical Dimensions and Drive:
This crawler drive tractor has a listed weight of 45,500 lbs and measures 198 inches in length with an open operator station and contracting band brakes.
Production
| Description | Agricultural Crawler tractor / Built in Springfield, Illinois, USA |
|---|---|
| Manufacturer | Allis Chalmers |
Engine
| Engine type | Allis-Chalmers 13.8L 6-cyl diesel |
|---|---|
| Fuel tank | 135 gal (511.0 L) |
| Air cleaner | oil bath |
| Bore/Stroke | 5.25x6.50 inches (133 x 165 mm) |
| Compression | 13.3:1 |
| Coolant capacity | 80 qts (75.7 L) |
| Description | Allis-Chalmers / supercharged diesel / 6-cylinder / liquid-cooled vertical I-head |
| Displacement | 844 ci (13.8 L) |
| Power | 225 hp (167.8 kW) |
| Rated RPM | 1800 |
| Starter volts | 24 |
| Drawbar (tested) | 135.12 hp (100.8 kW) |
Transmission
| Gears | 2 forward and 1 reverse |
|---|---|
| Transmission type | 2-speed torque converter |
| Type | torque converter |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Contracting band brakes |
| Drive | crawler |
Dimensions & Tires
| Height | 99 inches (251 cm) |
|---|---|
| Length | 198 inches (502 cm) |
| Weight | 45500 lbs (20638 kg) |
Dimensions & Tracks
| Description | Tracks |
|---|---|
| Weight | 45500 lbs (20638 kg) |
HD21 Serial Numbers
| Location: | Steering clutch housing or instrument panel |
|---|
Nebraska Tractor Test 550
| Description | Diesel 2-speed crawlerJuly 6 - 18, 1955Link: Nebraska Tractor Test 550 file / Drawbar performance |
|---|---|
| Max power | 135.12 hp (100.8 kW) |
| Max pull | 40563 lbs (18399 kg) |
References
| Description | Engineering-in-Action published in 1956, by Allis Chalmers |
|---|