Series 5G1-5G584, 1934 - 1936

The Gas FORTY replaced the (gas) THIRTY FIVE in 1934. It had a slight increase in power from 38 D.H.P (Drawbar Horse Power) to 44 D.H.P.

Like most tractors of the period, the FORTY was made in two versions, narrow 56 inch (see below) and wide 74 inch gauge versions.

The track frames were now welded rather than riveted. The FORTY was made in small numbers as diesel tractors were becoming more popular.


Photograph courtesy of Galynn Ferris

Production began in 1934 and continued until 1936 with only 584 tractors being built.

FORTY Details

4000G Spark ignition Engine 4 cylinders 5 1/8inch x 6 1/2inch bore / stroke.
44.19 D.H.P.
Weight 13,140 lbs.

Below is a list of machines made by year and serial number.

Year 5G
1934 1 42
1935 43 433
1936 434 584

The members here at ACMOC have a wealth of knowledge on Caterpillar machines and machinery.

Join today and you'll find digitized original manuals, historical photos, helpful members, and a wealth of information whether you already have a Caterpillar machine or are thinking of getting one, like the rest of us here at ACMOC, and trust us, you do need one.

The ACMOC Members Library contains Operation and Maintenance Instructions books, Parts Catalogs and Serviceman’s Reference Manuals, as well as links to YouTube videos showing detailed restoration of many popular tractors and some less popular ones!

Created by John Gaunt

Go to top