This page provides a detailed comparison of the specifications for the Allis Chalmers 620 and the CaseIH Farmall 90.
| Allis Chalmers 620 | CaseIH Farmall 90 | |
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| Engine | ||
| Engine Manufacturer | Onan | Turk Tractor |
| Engine Model | CCKB | FPT |
| Engine Cooling Type | Air-cooled | Liquid-cooled |
| Engine Fuel Type | Gasoline | Diesel |
| Engine Induction Type | Natural Aspirated | Turbocharged and Intercooled |
| Engine Cylinders | 2 | 4 |
| Engine Displacement Value | 50 ci (0.8 L) | 274 ci (4.5 L) |
| Engine Rated Rpm | 3600 | 2300 |
| Engine Power Output Value | 20 hp (14.5 kW) | 84 hp (62.6 kW) |
| Transmission | ||
| Transmission Type | Hydrostatic | 12-speed mechanical shuttle |
| Transmission Forward Gears | Infinite (3-range) | 12 |
| Transmission Reverse Gears | Infinite (3-range) | 12 |
| Dimensions | ||
| Length Value | 82.7 | - |
| Width Value | 47.6 | - |
| Operating Weight Value | 1499 lb (680 kg) | 5702 lb (2586 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 2WD |
| Drive Type | 2WD | 2-Wheel Drive |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hydraulic System Type | - | Open Center |
| Operator Station Type | Open | - |
| Starter Type | Electric | Electric Starter |
