This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the Mercedes-Benz Trac 900.
| Hart-Parr Old Reliable 30-60 | Mercedes-Benz Trac 900 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | - |
| Engine Cooling Type | Liquid-cooled | - |
| Engine Fuel Type | Kerosene | Diesel |
| Engine Induction Type | Natural | Turbocharged |
| Engine Cylinders | 2 | 4 |
| Engine Displacement Value | 2356 ci (38.6 L) | 242 ci (4.0 L) |
| Engine Rated Rpm | 300 | 2400 |
| Engine Power Output Value | - | 90 hp (67.1 kW) |
| Transmission | ||
| Transmission Type | Gear | - |
| Transmission Forward Gears | 1 | 16 |
| Transmission Reverse Gears | 1 | 8 |
| Dimensions | ||
| Length Value | 200 | 163.39 |
| Width Value | 106 | - |
| Operating Weight Value | 20100 lb (9117 kg) | 8996 lb (4081 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | 4x4 |
| Drive Type | 2WD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
