You are currently viewing Tractor, Sixty Cat

Tractor, Sixty Cat

© Bruce Evans
Year Built:
Type of Equipment:
Heavy Equipment
Logging Equipment
Caterpillar Tractor Company
Manufacturer Location:
East Peoria, IL
Motive Power:
In Service:
Jackson Valley near Branscomb, CA
Red River Lumber Company, Westwood, CA
Harwood Products of Branscomb
Mendocino County Museum
The Caterpillar Sixty (they were commonly called “Sixty Cat”) was the first logging tractor to be used extensively in the redwood region, although early Best and Holt products were seen in the woods from the teens on. The Sixty Cats were the largest gasoline-powered tractor ever built by Caterpillar.

This particular tractor was built in 1928 for the Red River lumber Company in Westwood, California. It featured special snow tracks made with a magnesium alloy so the drive sprocket could push accumulated show out of the tracks.

The tractor also featured a Conwhit Conversion—an after-market logging conversion that offered an enlarged radiator and a special low gear for logging.

After spending most of its life in the Sierras, the tractor was purchased in 1946 by Seth Whelock who owned a shingle mill in Jackson Valley near Branscomb. Whelock used the tractor for salvage logging on Union Lumber Company property, where it worked until the 1950’s. It was purchased by Warren Branson in 1952, who used it sparingly and preserved it until the late 1960’s when it was purchased by Harwood Products.

The tractor was donated to the Mendocino County Museum in Willits in 1984 by Harwood Products of Branscomb. (Harwood ceased operations in 2008.)