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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
Allis Chalmers D21 Series I vs Farmall 856
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Allis ChalmersAllis Chalmers D21 Series I
vs
FarmallFarmall 856
How they compare
Headline specs vs. the whole Row Crop
Engine Power
▲ D21 Series I higher · +8 hp (+8%)D21 Series I103 hp
85695 hp
Median Row Crop Tractor138 hp
D21 Series I is in the 27th percentile; 856 is in the 21st · 1,206 models
Engine Displacement
▲ D21 Series I higher · +19 ci (+5%)D21 Series I426 ci
856407 ci
Median Row Crop Tractor391 ci
D21 Series I is in the 72nd percentile; 856 is in the 57th · 1,409 models
Cylinders
= Effectively tiedD21 Series I6
8566
Median Row Crop Tractor6
D21 Series I is in the 50th percentile; 856 is in the 50th · 1,417 models
Forward Gears
= Effectively tiedD21 Series I8
8568
Median Row Crop Tractor16
D21 Series I is in the 16th percentile; 856 is in the 16th · 1,200 models
D21 Series I (A)856 (B)Median Row Crop Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Farmall | — |
| Model | D21 Series I | 856 | — |
| Category | Row Crop | Row Crop | Same |
Engine
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | International Harvester | — |
| Model | 3400 | D-407 | — |
| Power Output | 103hp | 95hp | ▲ D21 Series I+8 hp · +8% |
| Rated RPM | 2,200RPM | 2,400RPM | ▲ 856+200 RPM · +9% |
| Cylinders | 6 | 6 | Same |
| Displacement | 426ci | 407ci | ▲ D21 Series I+19 ci · +5% |
| Bore | 4.3in | 4.3in | Same |
| Stroke | 5in | 4.6in | ▲ D21 Series I+0.4 in · +9% |
Transmission
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | Sliding gear with dry disc clutch | Same |
Dimensions & Weight
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Length | 161in | 164in | ▲ 856+3 in · +2% |
| Width | 91.6in | 91.7in | ▲ 856+0.1 in · <1% |
| Height | 107in | Not recorded | — |
| Operating Weight | 9,500lb | 10,290lb | ▲ 856+790 lb · +8% |
Hydraulics
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Steering Type | Power | Hydrostatic power | — |
Power Take-off (PTO)
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Type | Independent | Independent | Same |
| Speed 1 | 1,000rpm | 1,000rpm | Same |
Hitch & Towing
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | IH Fast Hitch | — |
| Hitch Category | III/II | II | — |
| Hitch Position | Rear | Rear | Same |
Chassis & Drive
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | Not recorded | — |
| Drive Type | 2WD | 2WD | Same |
| Steering Type | Power | Hydrostatic power | — |
| Brake Type | Band actuated disc | Independent hydraulic disc | — |
Electrical
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
Capacities
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Coolant | 5.3gal | 6gal | ▲ 856+0.7 gal · +13% |
Operator Station
| Spec | Allis Chalmers D21 Series I | Farmall 856 | Difference |
|---|---|---|---|
| Type | Open | Open | Same |
Category context
Both models against the field
Engine Power
median 138 hpA · 27th percentile (103 hp)B · 21st percentile (95 hp)
Engine Displacement
median 391 ciA · 72nd percentile (426 ci)B · 57th percentile (407 ci)
Cylinders
median 6A · 50th percentile (6)B · 50th percentile (6)
Forward Gears
median 16A · 16th percentile (8)B · 16th percentile (8)
Operating Weight
median 12,307 lbA · 28th percentile (9,500 lb)B · 34th percentile (10,290 lb)
A · D21 Series IB · 856Median Row Crop Tractor