This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the John Deere 8335RT.
| Hart-Parr Old Reliable 30-60 | John Deere 8335RT | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | John Deere |
| Engine Model | - | PowerTech PSX |
| Engine Cooling Type | Liquid-cooled | Liquid-Cooled |
| Engine Fuel Type | Kerosene | Diesel |
| Engine Induction Type | Natural | Six cylinder vertical with two turbochargers and air-to-air aftercooler |
| Engine Cylinders | 2 | 6 |
| Engine Displacement Value | 2356 ci (38.6 L) | 548 ci (9.0 L) |
| Engine Rated Rpm | 300 | 2100 |
| Engine Power Output Value | - | 291 hp (216.7 kW) |
| Transmission | ||
| Transmission Type | Gear | Selective Gear Fixed Ratio with Full Range Operator Controlled Power Shift |
| Transmission Forward Gears | 1 | 16 |
| Transmission Reverse Gears | 1 | 4 |
| Dimensions | ||
| Length Value | 200 | 270.9 |
| Width Value | 106 | 134.6 |
| Operating Weight Value | 20100 lb (9117 kg) | 34945 lb (15851 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | Track Tractor |
| Drive Type | 2WD | Track |
| Hitch Category | - | 3 |
| Hydraulic System Type | - | Closed Center Pressure-Flow Compensated |
| Operator Station Type | - | Cab |
| Starter Type | - | Electric |
