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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 John Deere 3440
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John DeereModel B
John Deere 3440
Utility
- power
- 102 hp
- displacement
- 359 ci
- Cylinders
- 6
- Forward gears
- 8
Allis ChalmersAllis Chalmers D21 Series I
vs
John DeereJohn Deere 3440
How they compare
Headline specs vs. the whole Row Crop
Engine Power
▲ D21 Series I higher · +1 hp (<1%)D21 Series I103 hp
3440102 hp
Median Row Crop Tractor138 hp
D21 Series I is in the 27th percentile; 3440 is in the 26th · 1,206 models
Engine Displacement
▲ D21 Series I higher · +67 ci (+19%)D21 Series I426 ci
3440359 ci
Median Row Crop Tractor391 ci
D21 Series I is in the 72nd percentile; 3440 is in the 41st · 1,409 models
Cylinders
= Effectively tiedD21 Series I6
34406
Median Row Crop Tractor6
D21 Series I is in the 50th percentile; 3440 is in the 50th · 1,417 models
Forward Gears
= Effectively tiedD21 Series I8
34408
Median Row Crop Tractor16
D21 Series I is in the 16th percentile; 3440 is in the 16th · 1,200 models
D21 Series I (A)3440 (B)Median Row Crop Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | John Deere | — |
| Model | D21 Series I | 3440 | — |
| Category | Row Crop | Utility | — |
Engine
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | John Deere | — |
| Model | 3400 | Not recorded | — |
| Power Output | 103hp | 102hp | ▲ D21 Series I+1 hp · <1% |
| Rated RPM | 2,200RPM | 2,200RPM | Same |
| Cylinders | 6 | 6 | Same |
| Displacement | 426ci | 359ci | ▲ D21 Series I+67 ci · +19% |
| Bore | 4.3in | 4.2in | ▲ D21 Series I+0.1 in · +2% |
| Stroke | 5in | 4.3in | ▲ D21 Series I+0.7 in · +16% |
Transmission
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Type | Sliding gear with dry disc clutch | Syncro-Range | — |
Dimensions & Weight
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Length | 161in | 159in | ▲ D21 Series I+2 in · +1% |
| Width | 91.6in | 94.1in | ▲ 3440+2.5 in · +3% |
| Height | 107in | 91.3in | ▲ D21 Series I+15.7 in · +17% |
| Operating Weight | 9,500lb | 9,140lb | ▲ D21 Series I+360 lb · +4% |
Hydraulics
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Steering Type | Power | Not recorded | — |
Power Take-off (PTO)
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Type | Independent | Not recorded | — |
| Speed 1 | 1,000rpm | Not recorded | — |
Hitch & Towing
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Hitch Type | Three-Point Hitch | Not recorded | — |
| Hitch Category | III/II | Not recorded | — |
| Hitch Position | Rear | Not recorded | — |
Chassis & Drive
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | 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 I | John Deere 3440 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
Capacities
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Coolant | 5.3gal | 5.3gal | Same |
Operator Station
| Spec | Allis Chalmers D21 Series I | John Deere 3440 | Difference |
|---|---|---|---|
| Type | Open | Open operator station with ROPS | — |
Category context
Both models against the field
Engine Power
median 138 hpA · 27th percentile (103 hp)B · 26th percentile (102 hp)
Engine Displacement
median 391 ciA · 72nd percentile (426 ci)B · 41st percentile (359 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 · 27th percentile (9,140 lb)
A · D21 Series IB · 3440Median Row Crop Tractor