Compare/Allis Chalmers 7580 vs Allis Chalmers HD20

Allis Chalmers 7580 vs Allis Chalmers HD20

Verdict: Allis Chalmers 7580 vs Allis Chalmers HD20

The Allis Chalmers 7580 and the Allis Chalmers HD20 are both tractors — here is how they stack up on the figures that matter. Allis Chalmers 7580 leads on rated power with 186 hp against 175 hp. Allis Chalmers HD20 is the lighter machine (18,597 kg vs 23,100 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers 7580 holds more fuel (643.5 L vs 454.2 L) for longer stints between fills. Allis Chalmers 7580 is the newer design (1976 vs 1951). In short: choose the Allis Chalmers 7580 for outright pulling power, or the Allis Chalmers HD20 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Allis Chalmers

Fit score

Best match

Clear

Allis Chalmers

Fit score

Best match

Clear

Rated power

186 hp

175 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

With 20.8x38 rear tires.Reference

Drawbar performanceReference

Total built

1610Reference

3,100Reference

Original price

$63,084Reference

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Steering

hydrostatic powerReference

—

Drive

—

crawlerReference

Engine

Fuel tank

643.5 LReference

454.2 LReference

Drawbar (claimed)

114.1 kWReference

87.2 kWReference

Drawbar (tested)

114.6 kWReference

87.0 kWReference

Displacement

7.0 LReference

10.8 LReference

Bore/Stroke

108 x 127 mmReference

127 x 142 mmReference

Air cleaner

dryReference

—

Compression

16:1Reference

18.0:1Reference

Rated RPM

2550Reference

1700Reference

Idle RPM

775-2750Reference

—

Firing order

1-5-3-6-2-4Reference

—

Starter volts

12Reference

24Reference

Oil capacity

23.7 LReference

—

Coolant capacity

36.0 LReference

56.8 LReference

Power at rated engine speed

139.0 kWReference

—

Max power

114.6 kWReference

87.0 kWReference

Engine (net)

—

130.5 kWReference

Power (net)

—

130.5 kWReference

Transmission

Power DirectorReference

—

Gears

20 forward and 4 reverseReference

2 forward and 1 reverseReference

PTO & Hydraulics

PTO (claimed)

138.7 kWReference

—

PTO (tested)

139.0 kWReference

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Type

partial power shiftReference

torque converterReference

Valves

3 to 4Reference

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Pump flow

87.1 lpmReference

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Total flow

283.5 lpmReference

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Rear Type

IIIReference

—

Rear PTO

independentReference

—

Rear PTO Type

1000Reference

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Dimensions

Wheelbase

320 cmReference

—

Weight

23100 to 23510 poundsReference

18597 kgReference

Front tire

20.8x38Reference

—

Rear tire

20.8x38Reference

—

Ag front

18.4x38Reference

—

Ag rear

18.4x38Reference

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Length

571 cmReference

485 cmReference

Width

303 cmReference

277 cmReference

Height (hood)

216 cmReference

—

Height (exhaust)

381 cmReference

—

Ground clearance

43 cmReference

—

Front tread

157 to 312 cmReference

—

Rear tread

157 to 312 cmReference

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Shipping

10478 kgReference

—

Operating

10664 kgReference

—

Ballasted

11340 kgReference

—

Height

—

241 cmReference

7580 Serial Numbers

1976

1001Reference

—

1977

1288Reference

—

1978

1605Reference

—

1979

2218Reference

—

1980

2486Reference

—

1981

2717Reference

—

Location:

Front frame, rear left sideReference

Steering clutch housing or instrument panelReference

Final

3018Reference

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Electrical

Charging system

alternatorReference

—

Batteries

4Reference

—

Battery volts

12Reference

—

Test results

Fuel use

47.7 l/hourReference

—

Max pull

10573 kgReference

18743 kgReference

Speeds

HD20 Serial Numbers

1951

—

3001Reference

1952

—

3828Reference

1953

—

4923Reference

1954

—

5737Reference

Allis Chalmers HD20 Tracks

Length on ground

—

270 cmReference

Area on ground

—

3.3 m²Reference

Ground pressure

—

0.6 barReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.