ACMOC
Login | Register
ACMOC

The Cat DIESEL FORTY

Series 3G1-3G1971, 1934 - 1936

The DIESEL FORTY replaced the DIESEL THIRTY FIVE in 1934. Using the same engine, it had a slight increase in power from 41 D.H.P (Drawbar Horse Power) to 44 D.H.P.

Like most tractors of the period, the DIESEL 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 DIESEL FORTY was made in small numbers being replaced by the RD6 in 1936.

Cat DIESEL FORTY

Narrow (56 inch) gauge tractor above and wide (74 inch gauge below. Photographs courtesy Galynn Ferris

Cat DIESEL FORTY

Cat DIESEL FORTY

Production began in 1934 and continued until 1936 with only 1971 tractors being built.

DIESEL FORTY Details

3G1-3G1971

1934-1936

D6100 Diesel engine 3 cylinders 5 1/4inch x 6 1/2inch bore / stroke.

44.19 D.H.P.

Weight 14,700 lbs.

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

Year

3G

1934

1

334

1935

335

1956

1936

1957

1971

Created by John Gaunt

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!

YouTube Video Placeholder

Follow Us on Social Media

Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.

Upcoming Events

KORUMBURRA WORKING HORSE & TRACTOR & 100 YEARS OF CAT RALLY

Chapter Nineteen

| 5875 STH GIPPSLAND HWY, NYORA

Booleroo 2025

Chapter Thirty

| Booleroo Centre, 54 Arthur St, Booleroo Centre SA 5482, Australia

CAFES 2025 TULARE, CALIFORNIA

Chapter Fifteen

| Tulare, California

Wheatlands Warracknabeal Easter Rally

Chapter Nineteen

| 34 Henty Hwy, Warracknabeal
View Calendar
ACMOC

Antique Caterpillar
Machinery Owners Club

1115 Madison St NE # 1117
Salem, OR 97301

[email protected]

Terms & Privacy
Website developed by AdCo

Testimonials

"I also joined a year ago. had been on here a couple of times as a non-member and found the info very helpful so I got a one year subscription (not very expensive at all) to try it out. I really like all the resources on here so I just got a three year. I think its a very small price for what you can get out of this site."
-Jason N

Join Today!