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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 Zetor Forterra 10641
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ZetorModel B
Zetor Forterra 10641
Utility
- power
- 105 hp
- displacement
- 254 ci
- Cylinders
- 4
- Forward gears
- 24
Allis ChalmersAllis Chalmers D21 Series I
vs
ZetorZetor Forterra 10641
How they compare
Headline specs vs. the whole Row Crop
Engine Power
▲ Forterra 10641 higher · +2 hp (+2%)D21 Series I103 hp
Forterra 10641105 hp
Median Row Crop Tractor138 hp
D21 Series I is in the 27th percentile; Forterra 10641 is in the 28th · 1,206 models
Engine Displacement
▲ D21 Series I higher · +172 ci (+68%)D21 Series I426 ci
Forterra 10641254 ci
Median Row Crop Tractor391 ci
D21 Series I is in the 72nd percentile; Forterra 10641 is in the 17th · 1,409 models
Cylinders
▲ D21 Series I higher · +2 (+50%)D21 Series I6
Forterra 106414
Median Row Crop Tractor6
D21 Series I is in the 50th percentile; Forterra 10641 is in the 17th · 1,417 models
Forward Gears
▲ Forterra 10641 higher · +16 (+200%)D21 Series I8
Forterra 1064124
Median Row Crop Tractor16
D21 Series I is in the 16th percentile; Forterra 10641 is in the 81st · 1,200 models
D21 Series I (A)Forterra 10641 (B)Median Row Crop Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Zetor | — |
| Model | D21 Series I | Forterra 10641 | — |
| Category | Row Crop | Utility | — |
Engine
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | Zetor | — |
| Model | 3400 | Z 1303 | — |
| Power Output | 103hp | 105hp | ▲ Forterra 10641+2 hp · +2% |
| Rated RPM | 2,200RPM | 2,200RPM | Same |
| Cylinders | 6 | 4 | ▲ D21 Series I+2 · +50% |
| Displacement | 426ci | 254ci | ▲ D21 Series I+172 ci · +68% |
| Bore | 4.3in | 4.1in | ▲ D21 Series I+0.2 in · +5% |
| Stroke | 5in | 4.7in | ▲ D21 Series I+0.3 in · +6% |
Transmission
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | Synchronized | — |
Dimensions & Weight
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Length | 161in | 172in | ▲ Forterra 10641+11 in · +7% |
| Width | 91.6in | Not recorded | — |
| Height | 107in | 107in | Same |
| Operating Weight | 9,500lb | 9,500lb | Same |
Hydraulics
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| System Type | Not recorded | Open Center | — |
| Steering Type | Power | Power | Same |
Power Take-off (PTO)
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Type | Independent | Not recorded | — |
| Speed 1 | 1,000rpm | Not recorded | — |
Hitch & Towing
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | Three-Point Hitch | Same |
| Hitch Category | III/II | II | — |
| Hitch Position | Rear | Rear | Same |
Chassis & Drive
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Chassis Type | 4x2 2WD | 4x4 MFWD 4WD | — |
| Drive Type | 2WD | 4WD | — |
| Steering Type | Power | Power | Same |
| Brake Type | Band actuated disc | Not recorded | — |
Electrical
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
Capacities
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Coolant | 5.3gal | Not recorded | — |
Operator Station
| Spec | Allis Chalmers D21 Series I | Zetor Forterra 10641 | Difference |
|---|---|---|---|
| Type | Open | Not recorded | — |
Category context
Both models against the field
Engine Power
median 138 hpA · 27th percentile (103 hp)B · 28th percentile (105 hp)
Engine Displacement
median 391 ciA · 72nd percentile (426 ci)B · 17th percentile (254 ci)
Cylinders
median 6A · 50th percentile (6)B · 17th percentile (4)
Forward Gears
median 16A · 16th percentile (8)B · 81st percentile (24)
Operating Weight
median 12,307 lbA · 28th percentile (9,500 lb)B · 28th percentile (9,500 lb)
A · D21 Series IB · Forterra 10641Median Row Crop Tractor