This page provides a detailed comparison of the specifications for the Allis Chalmers D21 Series II and the Hart-Parr Old Reliable 30-60.
| Allis Chalmers D21 Series II | Hart-Parr Old Reliable 30-60 | |
|---|---|---|
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | Hart-Parr |
| Engine Model | 3500 | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Kerosene |
| Engine Induction Type | Naturally aspirated | Natural |
| Engine Cylinders | 6 | 2 |
| Engine Displacement Value | 426 ci (7.0 L) | 2356 ci (38.6 L) |
| Engine Rated Rpm | 2200 | 300 |
| Engine Power Output Value | 121 hp (90.2 kW) | - |
| Transmission | ||
| Transmission Type | Sliding gear with dry disc clutch | Gear |
| Transmission Forward Gears | 8 | 1 |
| Transmission Reverse Gears | 2 | 1 |
| Dimensions | ||
| Length Value | 160.2 | 200 |
| Width Value | 91.3 | 106 |
| Operating Weight Value | 9502 lb (4310 kg) | 20100 lb (9117 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | III/II | - |
| Hitch Position | Rear | - |
| Operator Station Type | Open | - |
| Starter Type | Electric | - |
