This page provides a detailed comparison of the specifications for the Hart-Parr Old Reliable 30-60 and the International Harvester 6588.
| Hart-Parr Old Reliable 30-60 | International Harvester 6588 | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | International Harvester |
| Engine Model | - | DT 466B |
| Engine Cooling Type | Liquid-cooled | liquid-cooled |
| Engine Fuel Type | Kerosene | diesel |
| Engine Induction Type | Natural | turbocharged |
| Engine Cylinders | 2 | 6 |
| Engine Displacement Value | 2356 ci (38.6 L) | 466 ci (7.6 L) |
| Engine Rated Rpm | 300 | 2400 |
| Engine Power Output Value | - | 177 hp (132.0 kW) |
| Transmission | ||
| Transmission Type | Gear | two-range power shift |
| Transmission Forward Gears | 1 | 16 |
| Transmission Reverse Gears | 1 | 8 |
| Dimensions | ||
| Length Value | 200 | 228.3 |
| Width Value | 106 | 101.61 |
| Operating Weight Value | 20100 lb (9117 kg) | 16320 lb (7403 kg) |
| Miscellaneous | ||
| Chassis | 4x2 | 4x4 articulated 4WD |
| Drive Type | 2WD | 4WD |
| Hitch Type | - | Category III/II |
| Hitch Category | - | Category 3 |
| Hitch Position | - | Rear |
| Hydraulic System Type | - | closed center |
| Starter Type | - | Electric |
