This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the RK Tractors RK55.
| Hart-Parr Old Reliable 30-60 | RK Tractors RK55 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | Yanmar |
| Engine Model | - | 4TNV86T-CR |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Kerosene | Diesel |
| Engine Induction Type | Natural | Turbocharged |
| Engine Cylinders | 2 | 4 |
| Engine Displacement Value | 2356 ci (38.6 L) | 128 ci (2.1 L) |
| Engine Rated Rpm | 300 | 2800 |
| Engine Power Output Value | - | 55 hp (41.0 kW) |
| Transmission | ||
| Transmission Type | Gear | - |
| Transmission Forward Gears | 1 | 16 |
| Transmission Reverse Gears | 1 | 16 |
| Dimensions | ||
| Length Value | 200 | 140.9 |
| Width Value | 106 | 63.8 |
| Operating Weight Value | 20100 lb (9117 kg) | - |
| Miscellaneous | ||
| Chassis | 4x2 | 4x4 MFWD 4WD |
| Drive Type | 2WD | 4WD |
| Hitch Category | - | I |
| Hitch Capacity Value | - | 3310 lb (1501 kg) |
| Operator Station Type | - | Two-post ROPS |
| Starter Type | - | Electric |
