
Allis ChalmersModel A
Allis Chalmers HD21
Agricultural
- power
- 225 hp
- displacement
- 844 ci
- Cylinders
- 6
- Forward gears
- 2
Head to head · Agricultural

Agricultural

Row Crop
How they compare
HD21 is in the 84th percentile; Magnum 225 is in the 84th · 1,028 models
HD21 is in the 96th percentile; Magnum 225 is in the 70th · 1,083 models
HD21 is in the 74th percentile; Magnum 225 is in the 74th · 1,130 models
HD21 is in the 99th percentile; Magnum 225 is in the 81st · 971 models
Full comparison
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | CaseIH | — |
| Model | HD21 | Magnum 225 | — |
| Category | Agricultural | Row Crop | — |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Manufacturer | Allis-Chalmers | CaseIH | — |
| Model | Not recorded | CDC | — |
| Power Output | 225hp | 225hp | Same |
| Rated RPM | 1,800RPM | 2,200RPM | ▲ Magnum 225+400 RPM · +22% |
| Cylinders | 6 | 6 | Same |
| Displacement | 844ci | 411ci | ▲ HD21+433 ci · +105% |
| Bore | 5.3in | 4.1in | ▲ HD21+1.2 in · +29% |
| Stroke | 6.5in | 5.2in | ▲ HD21+1.3 in · +25% |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Type | Torque Converter | CVT | — |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Length | 198in | 234in | ▲ Magnum 225+36 in · +18% |
| Width | Not recorded | 100in | — |
| Height | 99in | 129in | ▲ Magnum 225+30 in · +30% |
| Operating Weight | 45,500lb | 19,000lb | ▲ HD21+26,500 lb · +139% |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| System Type | Not recorded | Pressure Flow Compensating (PFC) | — |
| Steering Type | Not recorded | Hydrostatic power | — |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Hitch Type | Not recorded | Rear Type: II/III | — |
| Hitch Category | Not recorded | Category 3 | — |
| Hitch Position | Not recorded | Rear | — |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Chassis Type | Not recorded | 4x4 MFWD 4WD | — |
| Drive Type | Not recorded | 4WD | — |
| Steering Type | Not recorded | Hydrostatic power | — |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Coolant | 20gal | Not recorded | — |
| Spec | Allis Chalmers HD21 | CaseIH Magnum 225 | Difference |
|---|---|---|---|
| Type | Not recorded | Cab | — |
Category context