Allis ChalmersModel A
Allis Chalmers HD20
Industrial
- power
- Not recorded
- displacement
- 660 ci
- Cylinders
- 6
- Forward gears
- 2
Head to head · Industrial
Allis Chalmers HD20 vs International Harvester TD-25 Series 250
International HarvesterModel B
International Harvester TD-25 Series 250
Crawler
- power
- Not recorded
- displacement
- 817 ci
- Cylinders
- 6
- Forward gears
- 8
Allis ChalmersAllis Chalmers HD20
vs
International HarvesterInternational Harvester TD-25 Series 250
How they compare
Headline specs vs. the whole Industrial
Engine Displacement
▲ TD-25 Series 250 higher · +157 ci (+24%)HD20660 ci
TD-25 Series 250817 ci
Median Industrial Tractor284 ci
HD20 is in the 76th percentile; TD-25 Series 250 is in the 84th · 53 models
Cylinders
= Effectively tiedHD206
TD-25 Series 2506
Median Industrial Tractor4
HD20 is in the 88th percentile; TD-25 Series 250 is in the 88th · 55 models
Forward Gears
▲ TD-25 Series 250 higher · +6 (+300%)HD202
TD-25 Series 2508
Median Industrial Tractor5
HD20 is in the 1st percentile; TD-25 Series 250 is in the 85th · 43 models
Operating Weight
▲ TD-25 Series 250 higher · +4,550 lb (+11%)HD2041,000 lb
TD-25 Series 25045,550 lb
Median Industrial Tractor9,127 lb
HD20 is in the 97th percentile; TD-25 Series 250 is in the 98th · 49 models
HD20 (A)TD-25 Series 250 (B)Median Industrial Tractor
Full comparison
Every spec, side by side
General Information
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Manufacturer | Allis Chalmers | International Harvester | — |
| Model | HD20 | TD-25 Series 250 | — |
| Category | Industrial | Crawler | — |
Engine
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Manufacturer | General Motors | International Harvester | — |
| Rated RPM | 1,700RPM | 1,500RPM | ▲ HD20+200 RPM · +13% |
| Cylinders | 6 | 6 | Same |
| Displacement | 660ci | 817ci | ▲ TD-25 Series 250+157 ci · +24% |
| Bore | 5in | 5.4in | ▲ TD-25 Series 250+0.4 in · +8% |
| Stroke | 5.6in | 6in | ▲ TD-25 Series 250+0.4 in · +7% |
Transmission
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Type | Torque converter | Two-speed power shift | — |
Dimensions & Weight
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Length | 191in | 197in | ▲ TD-25 Series 250+6 in · +3% |
| Width | Not recorded | 104in | — |
| Height | 95in | 128in | ▲ TD-25 Series 250+33 in · +35% |
| Operating Weight | 41,000lb | 45,550lb | ▲ TD-25 Series 250+4,550 lb · +11% |
Hitch & Towing
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Hitch Category | Not recorded | Category 3 | — |
Electrical
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Starter Type | 24 volts | Electric | — |
Capacities
| Spec | Allis Chalmers HD20 | International Harvester TD-25 Series 250 | Difference |
|---|---|---|---|
| Coolant | 15gal | 18.6gal | ▲ TD-25 Series 250+3.6 gal · +24% |
Category context
Both models against the field
Engine Displacement
median 284 ciA · 76th percentile (660 ci)B · 84th percentile (817 ci)
Cylinders
median 4A · 88th percentile (6)B · 88th percentile (6)
Forward Gears
median 5A · 1st percentile (2)B · 85th percentile (8)
Operating Weight
median 9,127 lbA · 97th percentile (41,000 lb)B · 98th percentile (45,550 lb)
Length
median 125 inA · 86th percentile (191 in)B · 87th percentile (197 in)
A · HD20B · TD-25 Series 250Median Industrial Tractor