This page provides a detailed comparison of the specifications for the Challenger 75D and the Hart-Parr Old Reliable 30-60.
| Challenger 75D | Hart-Parr Old Reliable 30-60 | |
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| Engine | ||
| Engine Manufacturer | Caterpillar | Hart-Parr |
| Engine Model | 3176C ATAAC | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Kerosene |
| Engine Induction Type | Turbocharged intercooled | Natural |
| Engine Cylinders | 6 | 2 |
| Engine Displacement Value | 629 ci (10.3 L) | 2356 ci (38.6 L) |
| Engine Rated Rpm | 2100 | 300 |
| Engine Power Output Value | 330 hp (246.1 kW) | - |
| Transmission | ||
| Transmission Type | Full power shift | Gear |
| Transmission Forward Gears | 10 | 1 |
| Transmission Reverse Gears | 2 | 1 |
| Dimensions | ||
| Length Value | 232 | 200 |
| Width Value | 120 | 106 |
| Operating Weight Value | 35720 lb (16202 kg) | 20100 lb (9117 kg) |
| Miscellaneous | ||
| Chassis | - | 4x2 |
| Drive Type | - | 2WD |
| Hydraulic System Type | Closed-center pressure-compensated | - |
| Starter Type | Electric Starter | - |
