This page provides a detailed comparison of the specifications for the Allis Chalmers 7000 and the Challenger MT855C.
| Allis Chalmers 7000 | Challenger MT855C | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | Caterpillar |
| Engine Model | 2900 | C15 ACERT |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Turbocharged aftercooled |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 301 ci (4.9 L) | 923 ci (15.1 L) |
| Engine Rated Rpm | 2200 | 2100 |
| Engine Power Output Value | 117 hp (87.2 kW) | 475 hp (354.2 kW) |
| Transmission | ||
| Transmission Type | Partial power shift | Full power shift |
| Transmission Forward Gears | 12 | 16 |
| Transmission Reverse Gears | 3 | 4 |
| Dimensions | ||
| Length Value | 183 | 270 |
| Width Value | - | 141.8 |
| Operating Weight Value | 9550 lb (4332 kg) | 41000 lb (18597 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | - |
| Drive Type | 2WD | - |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | II | III/IVN |
| Hitch Position | Rear | Rear |
| Hydraulic System Type | Open center | Closed center pressure-flow compensated |
| Operator Station Type | Cab (Acousta-Cab optional or Acousta-Cab II from 1978) | Cab |
| Starter Type | Electric Starter | Electric |
