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
Allis Chalmers D21 Series II vs International Harvester A-866
International HarvesterModel B
International Harvester A-866
Row Crop
- power
- 121 hp
- displacement
- 358 ci
- Cylinders
- 6
- Forward gears
- 16
Allis ChalmersAllis Chalmers D21 Series II
vs
International HarvesterInternational Harvester A-866
How they compare
Headline specs vs. the whole Row Crop
Engine Power
= Effectively tiedD21 Series II121 hp
A-866121 hp
Median Row Crop Tractor138 hp
D21 Series II is in the 40th percentile; A-866 is in the 40th · 1,206 models
Engine Displacement
▲ D21 Series II higher · +68 ci (+19%)D21 Series II426 ci
A-866358 ci
Median Row Crop Tractor391 ci
D21 Series II is in the 72nd percentile; A-866 is in the 40th · 1,409 models
Cylinders
= Effectively tiedD21 Series II6
A-8666
Median Row Crop Tractor6
D21 Series II is in the 50th percentile; A-866 is in the 50th · 1,417 models
Forward Gears
▲ A-866 higher · +8 (+100%)D21 Series II8
A-86616
Median Row Crop Tractor16
D21 Series II is in the 16th percentile; A-866 is in the 50th · 1,200 models
D21 Series II (A)A-866 (B)Median Row Crop Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | International Harvester | — |
| Model | D21 Series II | A-866 | — |
| Category | Row Crop | Row Crop | Same |
Engine
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | International Harvester | — |
| Model | 3500 | D-358 | — |
| Power Output | 121hp | 121hp | Same |
| Rated RPM | 2,200RPM | Not recorded | — |
| Cylinders | 6 | 6 | Same |
| Displacement | 426ci | 358ci | ▲ D21 Series II+68 ci · +19% |
| Bore | 4.3in | 3.9in | ▲ D21 Series II+0.4 in · +10% |
| Stroke | 5in | 5.1in | ▲ A-866+0.1 in · +2% |
Transmission
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | Two-speed power shift | — |
Dimensions & Weight
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Length | 160in | Not recorded | — |
| Width | 91.3in | Not recorded | — |
| Height | 106in | Not recorded | — |
| Operating Weight | 9,502lb | Not recorded | — |
Hydraulics
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Steering Type | Power | Not recorded | — |
Power Take-off (PTO)
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Type | Independent | Not recorded | — |
| Speed 1 | 1,000rpm | Not recorded | — |
Hitch & Towing
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | Not recorded | — |
| Hitch Category | III/II | III | — |
| Hitch Position | Rear | Not recorded | — |
Chassis & Drive
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | 4x2 2WD | Same |
| Drive Type | 2WD | 2WD | Same |
| Steering Type | Power | Not recorded | — |
| Brake Type | Band actuated disc | Not recorded | — |
Electrical
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Starter Type | Electric | Not recorded | — |
Capacities
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Coolant | 7.8gal | Not recorded | — |
Operator Station
| Spec | Allis Chalmers D21 Series II | International Harvester A-866 | Difference |
|---|---|---|---|
| Type | Open | Not recorded | — |
Category context
Both models against the field
Engine Power
median 138 hpA · 40th percentile (121 hp)B · 40th percentile (121 hp)
Engine Displacement
median 391 ciA · 72nd percentile (426 ci)B · 40th percentile (358 ci)
Cylinders
median 6A · 50th percentile (6)B · 50th percentile (6)
Forward Gears
median 16A · 16th percentile (8)B · 50th percentile (16)
A · D21 Series IIB · A-866Median Row Crop Tractor