Serial number PV, 1929 - 1932

The Caterpillar FIFTEEN was introduced in 1929 and was, in effect a larger version of the Caterpillar TEN, being mechanically very similar. The PV Caterpillar FIFTEEN is sometimes referred to as the “BIG” FIFTEEN to distinguish it from a later model Caterpillar FIFTEEN (“LITTLE” FIFTEEN) introduced in 1932 which was the direct descendent of the Caterpillar TEN.

The “Big” FIFTEEN was available in two widths or gauges of 40inches and 50inches (tracks center to center) as well as a High Clearance option. As with all other machines of the time, the color changed from grey to Hi-Way yellow in December 1931.


Photograph courtesy John Gaunt


Gas engine 4 cylinders 3 3/4 inch bore x 5 inch stroke.
21.8 D.H.P. (Drawbar Horse Power)
Weight 4,500 to 5,500 pounds.

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

Year PV
1929 1 4023
1930 4024 7205
1931 7206 7311
1932 7312 7559

The Caterpillar FIFTEEN also formed the basis of one of the earliest forms of grader, or motor patrol.


Photograph courtesy Galynn Ferris


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