This page provides a detailed comparison of the specifications for the Challenger MT865 and the Hart-Parr Old Reliable 30-60.
| Challenger MT865 | Hart-Parr Old Reliable 30-60 | |
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| Engine | ||
| Engine Manufacturer | Caterpillar | Hart-Parr |
| Engine Model | C16 | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Kerosene |
| Engine Induction Type | Turbocharged | Natural |
| Engine Cylinders | 6 | 2 |
| Engine Displacement Value | 964 ci (15.8 L) | 2356 ci (38.6 L) |
| Engine Rated Rpm | 1750 | 300 |
| Engine Power Output Value | 524 hp (390.4 kW) | - |
| Transmission | ||
| Transmission Type | Selective gear fixed ratio with full operator-controlled power shift | Gear |
| Transmission Forward Gears | 16 | 1 |
| Transmission Reverse Gears | 4 | 1 |
| Dimensions | ||
| Length Value | 265.9 | 200 |
| Width Value | 142.1 | 106 |
| Operating Weight Value | 44220 lb (20058 kg) | 20100 lb (9117 kg) |
| Miscellaneous | ||
| Chassis | - | 4x2 |
| Drive Type | - | 2WD |
| Hitch Type | IVN | - |
| Hitch Position | Rear | - |
| Hydraulic System Type | Closed center load sensing | - |
| Operator Station Type | Cab | - |
| Starter Type | Electric | - |
