Allis Chalmers HD7

The Allis Chalmers HD7 is a tractor produced by Allis Chalmers. It is equipped with a 213 ci 3.5 L engine. Transmission: 4 forward and 1 reverse. Drive type: crawler. Operating weight: 14000 lbs 6350 kg.

Overview

	1940 - 1950 Agricultural Crawler tractor

Production
Manufacturer	Allis Chalmers
Agricultural Crawler tractor
Built in Springfield, Illinois, USA
Total built	1,803

Allis Chalmers HD7 Engine
General Motors 3.5L 3-cyl diesel
Fuel tank	31 gal 117.3 L
Engine details ...

Allis Chalmers HD7 Transmission
4-speed sliding gear
Transmission details ...

Allis Chalmers HD7 Power
Drawbar (claimed)	45 hp 33.6 kW
Belt (claimed)	60 hp 44.7 kW
Drawbar (tested)	57.31 hp 42.7 kW
Belt (tested)	68.68 hp 51.2 kW
Performance test details ...

Mechanical
Drive	crawler
Open operator station.

Dimensions & Tracks
Weight	14000 lbs 6350 kg
16-inch tracks
Full dimensions and tracks ...

References
HD-7 2-Cycle Diesel published in 1949, by Allis Chalmers
Operators Manual Model HD 7 Tractor (T-203E)
Build a Better Farm published in 1940, by Allis Chalmers

Engine

Engine Detail — 213 ci / 3.5 L Diesel

Manufacturer	General Motors 3-71
Configuration	3-cylinder, liquid-cooled 2-cycle vertical I-head
blower diesel
Displacement	213 ci 3.5 L
Bore/Stroke	4.25x5.00 inches 108 x 127 mm
Air cleaner	oil bath
Compression	16.0:1
Rated RPM	1500
Starter volts	12
Coolant capacity	23 qts 21.8 L
Oil capacity	8.5 qts 8.0 L

Allis Chalmers HD7 Engine

Transmission

Transmission — 4 forward and 1 reverse sliding gear

Type	sliding gear
Gears	4 forward and 1 reverse
Oil capacity	21 qts 19.9 L

Dimensions

Allis Chalmers HD7 Tracks
Width	16 inches 40 cm
Length on ground	67 inches 170 cm
Area on ground	2144 in² 1.4 m²
Ground pressure	5.83 psi 0.4 bar

Dimensions
Length	128 inches 325 cm
Width	81 inches 205 cm
Height	69 inches 175 cm
Operating weight	14000 lbs 6350 kg
Gauge	52 inches 132 cm

Tests

Nebraska Tractor Test 360
Diesel 4-speed crawler October 15 - 21, 1940 Link: Nebraska Tractor Test 360 file
Belt power (max)	68.68 hp 51.2 kW
Belt fuel use (max)	4.8 gal/hour 18.2 l/hour
Drawbar performance
Max power	57.31 hp 42.7 kW
Gear 1 used for power test.
Max pull	12,171 lbs 5520 kg
Gear 1 used for pull test.

Photos

Allis Chalmers HD7