Today in WW II: 30 Jun 1940 German forces land in Guernsey, the start of their five year Occupation of the Channel Islands.  More ↓
30 Jun 1943 Invasion of New Georgia, Central Solomons, with Munda as its objective.
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R-4 Caterpillar Bulldozer / Tractor

Caterpillar introduced the R4 (6G series) in 1938, based on the earlier Caterpillar Thirty, and the R4 was produced until 1944. It was powered by a 4 cyl. gasoline engine and had both a 44 inch and a 60 inch track gauge (width). The R-4 had only one upper track roller, compared to two rollers on the Cat Thirty. The later D4 Caterpillar tractor was based on the R-4.

The rear winch was a Hyster D4 while the power control unit was by LaTourneau.

The dataplate states that the maximum drawbar pull is 7,332 lbs. and the maximum ground speed is 5.4 mph.

Thanks to Stephen A. Sarkany for help with this page.

USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit
USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit.

USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit
USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit.

USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit
USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit.

Data plate of USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit
Data plate of USN Seebee R-4 Caterpillar Tractor with bulldozer blade, Carswell Strategic Air Command Base, Ft. Worth, TX. Photographed 10 November 2006. Photo: Courtesy of Bob Pettit.