This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the Sears SS-15.
| Hart-Parr Old Reliable 30-60 | Sears SS-15 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | Briggs & Stratton |
| Engine Model | - | 325431 |
| Engine Cooling Type | Liquid-cooled | Air-cooled |
| Engine Fuel Type | Kerosene | Gasoline |
| Engine Induction Type | Natural | Naturally aspirated |
| Engine Cylinders | 2 | 1 |
| Engine Displacement Value | 2356 ci (38.6 L) | 32 ci (0.5 L) |
| Engine Rated Rpm | 300 | 3600 |
| Engine Power Output Value | - | 15 hp (11.2 kW) |
| Transmission | ||
| Transmission Type | Gear | Belt-driven gear |
| Transmission Forward Gears | 1 | 6 |
| Transmission Reverse Gears | 1 | 2 |
| Dimensions | ||
| Length Value | 200 | 65 |
| Width Value | 106 | 38.2 |
| Operating Weight Value | 20100 lb (9117 kg) | 664 lb (301 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | 4x2 2WD |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | - | Sears 3-Point (optional) |
| Operator Station Type | - | Open operator station |
| Starter Type | - | Electric |
