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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 Versatile 256
VersatileModel B
Versatile 256
Four-Wheel Drive
- power
- 101 hp
- displacement
- 239 ci
- Cylinders
- 4
- Forward gears
- Not recorded
Allis ChalmersAllis Chalmers D21 Series I
vs
VersatileVersatile 256
How they compare
Headline specs vs. the whole Row Crop
Engine Power
▲ D21 Series I higher · +2 hp (+2%)D21 Series I103 hp
256101 hp
Median Row Crop Tractor138 hp
D21 Series I is in the 27th percentile; 256 is in the 26th · 1,206 models
Engine Displacement
▲ D21 Series I higher · +187 ci (+78%)D21 Series I426 ci
256239 ci
Median Row Crop Tractor391 ci
D21 Series I is in the 72nd percentile; 256 is in the 14th · 1,409 models
Cylinders
▲ D21 Series I higher · +2 (+50%)D21 Series I6
2564
Median Row Crop Tractor6
D21 Series I is in the 50th percentile; 256 is in the 17th · 1,417 models
Operating Weight
▲ 256 higher · +2,150 lb (+23%)D21 Series I9,500 lb
25611,650 lb
Median Row Crop Tractor12,307 lb
D21 Series I is in the 28th percentile; 256 is in the 45th · 1,350 models
D21 Series I (A)256 (B)Median Row Crop Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Versatile | — |
| Model | D21 Series I | 256 | — |
| Category | Row Crop | Four-Wheel Drive | — |
Engine
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Cummins | — |
| Model | 3400 | 4BT 3.9 | — |
| Power Output | 103hp | 101hp | ▲ D21 Series I+2 hp · +2% |
| Rated RPM | 2,200RPM | 2,500RPM | ▲ 256+300 RPM · +14% |
| Cylinders | 6 | 4 | ▲ D21 Series I+2 · +50% |
| Displacement | 426ci | 239ci | ▲ D21 Series I+187 ci · +78% |
| Bore | 4.3in | 4in | ▲ D21 Series I+0.3 in · +7% |
| Stroke | 5in | 4.7in | ▲ D21 Series I+0.3 in · +6% |
Transmission
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | Hydrostatic | — |
Dimensions & Weight
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Length | 161in | Not recorded | — |
| Width | 91.6in | Not recorded | — |
| Height | 107in | 112in | ▲ 256+5 in · +5% |
| Operating Weight | 9,500lb | 11,650lb | ▲ 256+2,150 lb · +23% |
Hydraulics
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| System Type | Not recorded | Closed center load sensing | — |
| Steering Type | Power | Power | Same |
Power Take-off (PTO)
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Type | Independent | Optional Transmission or Live PTO | — |
| Speed 1 | 1,000rpm | Not recorded | — |
Hitch & Towing
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | II/I* | — |
| Hitch Category | III/II | Category 3 | — |
| Hitch Position | Rear | Rear | Same |
Chassis & Drive
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | 4x4 articulated 4WD | — |
| Drive Type | 2WD | 4WD | — |
| Steering Type | Power | Power | Same |
| Brake Type | Band actuated disc | Not recorded | — |
Electrical
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Starter Type | Electric | Not recorded | — |
Capacities
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Coolant | 5.3gal | 5.8gal | ▲ 256+0.5 gal · +9% |
Operator Station
| Spec | Allis Chalmers D21 Series I | Versatile 256 | Difference |
|---|---|---|---|
| Type | Open | Not recorded | — |
Category context
Both models against the field
Engine Power
median 138 hpA · 27th percentile (103 hp)B · 26th percentile (101 hp)
Engine Displacement
median 391 ciA · 72nd percentile (426 ci)B · 14th percentile (239 ci)
Cylinders
median 6A · 50th percentile (6)B · 17th percentile (4)
Operating Weight
median 12,307 lbA · 28th percentile (9,500 lb)B · 45th percentile (11,650 lb)
Height
median 114 inA · 29th percentile (107 in)B · 44th percentile (112 in)
A · D21 Series IB · 256Median Row Crop Tractor