Allis ChalmersModel A
Allis Chalmers HD21
Agricultural
- power
- 225 hp
- displacement
- 844 ci
- Cylinders
- 6
- Forward gears
- 2
Head to head · Agricultural
Allis Chalmers HD21 vs John Deere 7R 230
Image not recorded
John DeereModel B
John Deere 7R 230
Row Crop
- power
- 228 hp
- displacement
- 414 ci
- Cylinders
- 6
- Forward gears
- 23
Allis ChalmersAllis Chalmers HD21
vs
John DeereJohn Deere 7R 230
How they compare
Headline specs vs. the whole Agricultural
Engine Power
▲ 7R 230 higher · +3 hp (+1%)HD21225 hp
7R 230228 hp
Median Agricultural Tractor110 hp
HD21 is in the 84th percentile; 7R 230 is in the 85th · 1,028 models
Engine Displacement
▲ HD21 higher · +430 ci (+104%)HD21844 ci
7R 230414 ci
Median Agricultural Tractor336 ci
HD21 is in the 96th percentile; 7R 230 is in the 70th · 1,083 models
Cylinders
= Effectively tiedHD216
7R 2306
Median Agricultural Tractor5.5
HD21 is in the 74th percentile; 7R 230 is in the 74th · 1,130 models
Forward Gears
▲ 7R 230 higher · +21 (+1050%)HD212
7R 23023
Median Agricultural Tractor16
HD21 is in the 1st percentile; 7R 230 is in the 76th · 972 models
HD21 (A)7R 230 (B)Median Agricultural Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | John Deere | — |
| Model | HD21 | 7R 230 | — |
| Category | Agricultural | Row Crop | — |
Engine
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Manufacturer | Allis-Chalmers | John Deere | — |
| Power Output | 225hp | 228hp | ▲ 7R 230+3 hp · +1% |
| Rated RPM | 1,800RPM | 1,701RPM | ▲ HD21+99 RPM · +6% |
| Cylinders | 6 | 6 | Same |
| Displacement | 844ci | 414ci | ▲ HD21+430 ci · +104% |
| Bore | 5.3in | 4.2in | ▲ HD21+1.1 in · +26% |
| Stroke | 6.5in | 5in | ▲ HD21+1.5 in · +30% |
Transmission
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Type | Torque Converter | Selective gear fixed ratio with full range operator controlled powershift | — |
Dimensions & Weight
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Length | 198in | 217in | ▲ 7R 230+19 in · +10% |
| Height | 99in | Not recorded | — |
| Operating Weight | 45,500lb | 22,685lb | ▲ HD21+22,815 lb · +101% |
Hydraulics
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| System Type | Not recorded | Closed-center pressure flow compensated | — |
| Steering Type | Not recorded | Power | — |
Tires
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Front Tire Size | Not recorded | 420/90R30 | — |
| Rear Tire Size | Not recorded | 480/80R46 | — |
Hitch & Towing
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Hitch Type | Not recorded | Category III/IIIN | — |
| Hitch Position | Not recorded | Rear | — |
Chassis & Drive
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Chassis Type | Not recorded | 4x4 MFWD 4WD | — |
| Drive Type | Not recorded | 4WD | — |
| Steering Type | Not recorded | Power | — |
Electrical
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Starter Type | Electric | Electric | Same |
Capacities
| Spec | Allis Chalmers HD21 | John Deere 7R 230 | Difference |
|---|---|---|---|
| Coolant | 20gal | Not recorded | — |
Category context
Both models against the field
Engine Power
median 110 hpA · 84th percentile (225 hp)B · 85th percentile (228 hp)
Engine Displacement
median 336 ciA · 96th percentile (844 ci)B · 70th percentile (414 ci)
Cylinders
median 5.5A · 74th percentile (6)B · 74th percentile (6)
Forward Gears
median 16A · 1st percentile (2)B · 76th percentile (23)
Operating Weight
median 10,914 lbA · 99th percentile (45,500 lb)B · 89th percentile (22,685 lb)
A · HD21B · 7R 230Median Agricultural Tractor