This page provides a detailed comparison of the specifications for the Hart-Parr 40-80 and the John Deere 6120M.
| Hart-Parr 40-80 | John Deere 6120M | |
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| Engine | ||
| Engine Manufacturer | Hart-Parr | John Deere |
| Engine Model | - | PowerTech PSS (Serial No. CD4045U029280) |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Kerosene | Diesel |
| Engine Induction Type | Natural Aspiration | Turbocharged aftercooled |
| Engine Cylinders | 4 | 4 |
| Engine Displacement Value | 3309 ci (54.2 L) | 4525.0 cc |
| Engine Rated Rpm | - | 2100 |
| Engine Power Output Value | 110 hp (82.0 kW) | 98 hp (73.2 kW) |
| Transmission | ||
| Transmission Type | - | CommandQuad |
| Transmission Forward Gears | - | 24 |
| Transmission Reverse Gears | - | 24 |
| Dimensions | ||
| Length Value | - | 176.6 |
| Width Value | - | 100.4 |
| Operating Weight Value | 34000 lb (15422 kg) | 12050 lb (5466 kg) |
| Miscellaneous | ||
| Chassis | 2WD | 4x2 2WD |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | - | Three-point |
| Hitch Category | Category 3 | 3 |
| Hitch Position | - | Rear |
| Hitch Capacity Value | - | 5845 lb (2651 kg) |
| Hydraulic System Type | - | Open Center |
| Operator Station Type | - | Cab |
| Starter Type | - | Electric |
