
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; X6.430 is in the 40th · 1,206 models
D21 Series II is in the 72nd percentile; X6.430 is in the 25th · 1,409 models
D21 Series II is in the 50th percentile; X6.430 is in the 17th · 1,417 models
D21 Series II is in the 16th percentile; X6.430 is in the 95th · 1,200 models
Full comparison
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | McCormick Intl | — |
| Model | D21 Series II | X6.430 | — |
| Category | Row Crop | Utility | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | McCormick Intl | — |
| Model | 3500 | BetaPower | — |
| Power Output | 121hp | 121hp | Same |
| Rated RPM | 2,200RPM | 2,200RPM | Same |
| Cylinders | 6 | 4 | ▲ D21 Series II+2 · +50% |
| Displacement | 426ci | 275ci | ▲ D21 Series II+151 ci · +55% |
| Bore | 4.3in | 4.1in | ▲ D21 Series II+0.2 in · +5% |
| Stroke | 5in | 5.2in | ▲ X6.430+0.2 in · +4% |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | Power Shift | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Length | 160in | 173in | ▲ X6.430+13 in · +8% |
| Width | 91.3in | 80.9in | ▲ D21 Series II+10.4 in · +13% |
| Height | 106in | 110in | ▲ X6.430+4 in · +4% |
| Ground Clearance | Not recorded | 16.5in | — |
| Operating Weight | 9,502lb | 10,362lb | ▲ X6.430+860 lb · +9% |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| System Type | Not recorded | Open Center | — |
| Steering Hydraulic Flow | Not recorded | 10gpm | — |
| Steering Type | Power | Power | Same |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Type | Independent | Not recorded | — |
| Speed 1 | 1,000rpm | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | Three-Point Hitch | Same |
| Hitch Category | III/II | II | — |
| Hitch Position | Rear | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | 4x4 MFWD 4WD | — |
| Drive Type | 2WD | 4WD | — |
| Steering Type | Power | Power | Same |
| Brake Type | Band actuated disc | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Standard | Not recorded | Interim Tier IV | — |
| Control System | Not recorded | Selective Catalytic Reduction (SCR) | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Coolant | 7.8gal | Not recorded | — |
| Spec | Allis Chalmers D21 Series II | McCormick Intl X6.430 | Difference |
|---|---|---|---|
| Type | Open | Not recorded | — |
Category context