This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the Valtra T121.
| Hart-Parr Old Reliable 30-60 | Valtra T121 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | Sisu Diesel |
| Engine Model | - | 66 CTA-4V |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Kerosene | Diesel |
| Engine Induction Type | Natural | - |
| Engine Cylinders | 2 | 6 |
| Engine Displacement Value | 2356 ci (38.6 L) | 403 ci (6.6 L) |
| Engine Rated Rpm | 300 | 2200 |
| Engine Power Output Value | - | 133 hp (99.2 kW) |
| Transmission | ||
| Transmission Type | Gear | - |
| Transmission Forward Gears | 1 | 36 |
| Transmission Reverse Gears | 1 | 36 |
| Dimensions | ||
| Length Value | 200 | 203.1 |
| Width Value | 106 | 92.1 |
| Operating Weight Value | 20100 lb (9117 kg) | 12460 lb (5652 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | 4x4 MFWD 4WD |
| Drive Type | 2WD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Category | - | III |
| Operator Station Type | - | Cab |
| Starter Type | - | Electric |
