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

Utility
How they compare
D21 Series I is in the 27th percentile; 8240 is in the 29th · 1,206 models
D21 Series I is in the 72nd percentile; 8240 is in the 80th · 1,409 models
D21 Series I is in the 50th percentile; 8240 is in the 50th · 1,417 models
D21 Series I is in the 16th percentile; 8240 is in the 50th · 1,200 models
Full comparison
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | New Holland | — |
| Model | D21 Series I | 8240 | — |
| Category | Row Crop | Utility | — |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Ford | — |
| Model | 3400 | Genesis | — |
| Power Output | 103hp | 106hp | ▲ 8240+3 hp · +3% |
| Rated RPM | 2,200RPM | 2,100RPM | ▲ D21 Series I+100 RPM · +5% |
| Cylinders | 6 | 6 | Same |
| Displacement | 426ci | 456ci | ▲ 8240+30 ci · +7% |
| Bore | 4.3in | 4.4in | ▲ 8240+0.1 in · +2% |
| Stroke | 5in | 5in | Same |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | SynchroShift | — |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Length | 161in | 176in | ▲ 8240+15 in · +9% |
| Width | 91.6in | 83in | ▲ D21 Series I+8.6 in · +10% |
| Height | 107in | Not recorded | — |
| Operating Weight | 9,500lb | 10,882lb | ▲ 8240+1,382 lb · +15% |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| System Type | Not recorded | Gear pump | — |
| Steering Type | Power | Hydrostatic power | — |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Type | Independent | Not recorded | — |
| Speed 1 | 1,000rpm | Not recorded | — |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | Three-Point Hitch | Same |
| Hitch Category | III/II | II | — |
| Hitch Position | Rear | Rear | Same |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | Not recorded | — |
| Drive Type | 2WD | Not recorded | — |
| Steering Type | Power | Hydrostatic power | — |
| Brake Type | Band actuated disc | Not recorded | — |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Coolant | 5.3gal | 5.3gal | Same |
| Spec | Allis Chalmers D21 Series I | New Holland 8240 | Difference |
|---|---|---|---|
| Type | Open | Not recorded | — |
Category context