This page provides a detailed comparison of the specifications for the Fox River Tractor Company 20-40 and the Hart-Parr 40.
| Fox River Tractor Company 20-40 | Hart-Parr 40 | |
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| Engine | ||
| Engine Manufacturer | Fox River Tractor Company | Hart-Parr |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Kerosene | Kerosene |
| Engine Induction Type | Naturally aspirated | - |
| Engine Cylinders | 4 | 4 |
| Engine Displacement Value | 713 ci (11.7 L) | 618 ci (10.1 L) |
| Engine Rated Rpm | 650 | 802 |
| Engine Power Output Value | - | 41 hp (30.3 kW) |
| Transmission | ||
| Transmission Type | Gear | Gear |
| Transmission Forward Gears | 3 | 2 |
| Transmission Reverse Gears | 1 | 1 |
| Dimensions | ||
| Length Value | 138 | 140 |
| Width Value | 72 | 96 |
| Operating Weight Value | 6700 lb (3039 kg) | 6300 lb (2858 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Starter Type | Hand-crank | - |
