This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the Hesston 666.
| Hart-Parr Old Reliable 30-60 | Hesston 666 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | Fiat |
| Engine Model | - | 8045.02 |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Kerosene | Diesel |
| Engine Induction Type | Natural | Natural aspiration |
| Engine Cylinders | 2 | 4 |
| Engine Displacement Value | 2356 ci (38.6 L) | 211 ci (3.5 L) |
| Engine Rated Rpm | 300 | - |
| Transmission | ||
| Transmission Type | Gear | 12-Speed |
| Transmission Forward Gears | 1 | 12 |
| Transmission Reverse Gears | 1 | 4 |
| Dimensions | ||
| Length Value | 200 | 139 |
| Width Value | 106 | - |
| Operating Weight Value | 20100 lb (9117 kg) | 5689 lb (2580 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | 4x2 2WD |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | - | Category 2 |
| Hitch Category | - | Category 2 |
| Hitch Position | - | Rear |
| Hydraulic System Type | - | Open center |
| Starter Type | - | 12 volts |
