This page provides a detailed comparison of the specifications for the Allis Chalmers D21 Series II and the Ursus 1212.
| Allis Chalmers D21 Series II | Ursus 1212 | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | Ursus |
| Engine Model | 3500 | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Naturally aspirated | Naturally Aspirated |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 426 ci (7.0 L) | 418 ci (6.8 L) |
| Engine Rated Rpm | 2200 | 2200 |
| Engine Power Output Value | 121 hp (90.2 kW) | 120 hp (89.5 kW) |
| Transmission | ||
| Transmission Type | Sliding gear with dry disc clutch | - |
| Transmission Forward Gears | 8 | 16 |
| Transmission Reverse Gears | 2 | 8 |
| Dimensions | ||
| Length Value | 160.2 | 175.5 |
| Width Value | 91.3 | - |
| Operating Weight Value | 9502 lb (4310 kg) | 9746 lb (4421 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | III/II | Category 3 |
| Hitch Position | Rear | - |
| Operator Station Type | Open | - |
| Starter Type | Electric | Electric |
