This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the Oliver OC-6.
| Hart-Parr Old Reliable 30-60 | Oliver OC-6 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | Oliver-Waukesha |
| Engine Cooling Type | Liquid-cooled | - |
| Engine Fuel Type | Kerosene | Gasoline |
| Engine Induction Type | Natural | Naturally Aspirated |
| Engine Cylinders | 2 | 6 |
| Engine Displacement Value | 2356 ci (38.6 L) | 194 ci (3.2 L) |
| Engine Rated Rpm | 300 | 1600 |
| Engine Power Output Value | - | 34 hp (25.7 kW) |
| Transmission | ||
| Transmission Type | Gear | Gear |
| Transmission Forward Gears | 1 | 6 |
| Transmission Reverse Gears | 1 | 2 |
| Dimensions | ||
| Length Value | 200 | 121.5 |
| Width Value | 106 | 56.25 |
| Operating Weight Value | 20100 lb (9117 kg) | 5565 lb (2524 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | Tracked |
| Drive Type | 2WD | Crawler |
