This page provides a detailed comparison of the specifications for the Allis Chalmers HD20 and the Caterpillar D6D SA Special Application.
| Allis Chalmers HD20 | Caterpillar D6D SA Special Application | |
|---|---|---|
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| Engine | ||
| Engine Manufacturer | General Motors | Caterpillar |
| Engine Model | - | 3306 |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Blower | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 660 ci (10.8 L) | 638 ci (10.5 L) |
| Engine Rated Rpm | 1700 | 2000 |
| Transmission | ||
| Transmission Type | Torque converter | Gear |
| Transmission Forward Gears | 2 | 6 |
| Transmission Reverse Gears | 1 | 4 |
| Dimensions | ||
| Length Value | 191 | 156 |
| Width Value | - | 94 |
| Operating Weight Value | 41000 lb (18597 kg) | 29000 lb (13154 kg) |
| Miscellaneous | ||
| Hydraulic System Type | - | Open Center |
| Operator Station Type | - | Open |
| Starter Type | 24 volts | Electric Starter |
