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Tractor · 1940Unverified

Allis Chalmers HD7

Name: Allis Chalmers HD7
Brand: Allis Chalmers

Allis Chalmers HD7 — Agricultural Crawler tractor · 45 hp. Reference specifications; pending source verification.

The Allis Chalmers HD7 is a tractor model with a rated power output of 45 hp, categorising it among the more compact options in its class. Manufactured from 1940 to 1950, this model features a 3-cylinder diesel liquid-cooled engine, which drives a tracked undercarriage via a 4-speed gearbox. The listed weight of the HD7 is 6350 kg, and it is suited to tasks covering areas of approximately up to 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

45 hp

Max power

42.7 kW

Weight

6350 kg

Catalogue coverage

Variants represented

Richest spec table

60 rows

Recorded power

45 hp

Recorded weight

6350 kg

Transmissions

4-speed sliding gear

Production years

1940-1950

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerAllis ChalmersReference

Agricultural Crawler tractorReference

Built in Springfield, Illinois, USAReference

Total built1,803Reference

DrivecrawlerReference

Open operator station.Reference

Engine

General Motors 3.5L 3-cyl dieselReference

Fuel tank117.3 LReference

Drawbar (claimed)33.6 kWReference

Belt (claimed)44.7 kWReference

Drawbar (tested)42.7 kWReference

Belt (tested)51.2 kWReference

General Motors 3-71Reference

blower dieselReference

3-cylinderReference

liquid-cooled 2-cycle vertical I-headReference

Displacement3.5 LReference

Bore/Stroke108 x 127 mmReference

Air cleaneroil bathReference

Compression16.0:1Reference

Rated RPM1500Reference

Starter volts12Reference

Coolant capacity21.8 LReference

Oil capacity8.0 LReference

Belt power (max)51.2 kWReference

Max power42.7 kWReference

Transmission

4-speed sliding gearReference

Typesliding gearReference

Gears4 forward and 1 reverseReference

Oil capacity19.9 LReference

Dimensions

Weight6350 kgReference

16-inch tracksReference

Length325 cmReference

Width205 cmReference

Height175 cmReference

Operating weight6350 kgReference

Gauge132 cmReference

HD7 Serial Numbers

Location:Serial number stamped on the right-rear of the transmission case or on a plate near the instrument panel.Reference

19403Reference

1941503Reference

19421137Reference

19435403Reference

19445753Reference

19458949Reference

194612091Reference

194713078Reference

194815122Reference

194916752Reference

195018086Reference

FAQ: How to read a serial number table.Reference

Allis Chalmers HD7 Tracks

Width40 cmReference

Length on ground170 cmReference

Area on ground1.4 m²Reference

Ground pressure0.4 barReference

Test results

Diesel 4-speed crawlerOctober 15 - 21, 1940Link: Nebraska Tractor Test 360 fileReference

Belt fuel use (max)18.2 l/hourReference

Drawbar performanceReference

Gear 1 used for power test.Reference

Max pull5520 kgReference

Gear 1 used for pull test.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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