
Allis ChalmersModel A
Allis Chalmers D21 Series II
Row Crop
- power
- 121 hp
- displacement
- 426 ci
- Cylinders
- 6
- Forward gears
- 8
Head to head · Row Crop

Row Crop
Utility
How they compare
D21 Series II is in the 40th percentile; Puma 125 is in the 42nd · 1,206 models
D21 Series II is in the 72nd percentile; Puma 125 is in the 63rd · 1,409 models
D21 Series II is in the 50th percentile; Puma 125 is in the 50th · 1,417 models
D21 Series II is in the 16th percentile; Puma 125 is in the 61st · 1,200 models
Full comparison
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | CaseIH | — |
| Model | D21 Series II | Puma 125 | — |
| Category | Row Crop | Utility | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | CNH | — |
| Model | 3500 | Not recorded | — |
| Power Output | 121hp | 125hp | ▲ Puma 125+4 hp · +3% |
| Rated RPM | 2,200RPM | 2,200RPM | Same |
| Cylinders | 6 | 6 | Same |
| Displacement | 426ci | 411ci | ▲ D21 Series II+15 ci · +4% |
| Bore | 4.3in | 4.1in | ▲ D21 Series II+0.2 in · +5% |
| Stroke | 5in | 5.2in | ▲ Puma 125+0.2 in · +4% |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | 18-speed partial power shift | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Length | 160in | Not recorded | — |
| Width | 91.3in | Not recorded | — |
| Height | 106in | 118in | ▲ Puma 125+12 in · +11% |
| Operating Weight | 9,502lb | 13,260lb | ▲ Puma 125+3,758 lb · +40% |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| System Type | Not recorded | Closed center pressure flow compensated (PFC) | — |
| Steering Type | Power | Hydrostatic power | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Type | Independent | Not recorded | — |
| Speed 1 | 1,000rpm | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | Not recorded | — |
| Hitch Category | III/II | Not recorded | — |
| Hitch Position | Rear | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | 4x4 MFWD 4WD | — |
| Drive Type | 2WD | Four-wheel drive (4WD) | — |
| Steering Type | Power | Hydrostatic power | — |
| Brake Type | Band actuated disc | Hydraulic wet disc | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric Starter | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Coolant | 7.8gal | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | CaseIH Puma 125 | Difference |
|---|---|---|---|
| Type | Open | Cab | — |
Category context