This page provides a detailed comparison of the specifications for the David Brown 4600 Selectamatic and the Hart-Parr Old Reliable 30-60.
| David Brown 4600 Selectamatic | Hart-Parr Old Reliable 30-60 | |
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| Engine | ||
| Engine Manufacturer | David Brown | Hart-Parr |
| Engine Cooling Type | Liquid-Cooled | Liquid-cooled |
| Engine Fuel Type | Gasoline | Kerosene |
| Engine Induction Type | Natural Aspiration | Natural |
| Engine Cylinders | 3 | 2 |
| Engine Displacement Value | 164 ci (2.7 L) | 2356 ci (38.6 L) |
| Engine Rated Rpm | 2200 | 300 |
| Transmission | ||
| Transmission Type | Gear | Gear |
| Transmission Forward Gears | 6 | 1 |
| Transmission Reverse Gears | 2 | 1 |
| Dimensions | ||
| Length Value | 121.5 | 200 |
| Width Value | 68.375 | 106 |
| Operating Weight Value | 4300 lb (1950 kg) | 20100 lb (9117 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | 4x2 |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | II/I | - |
| Hitch Position | Rear | - |
| Operator Station Type | Open | - |
| Starter Type | Electric | - |
