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The HT4 was introduced in 1950 and was a new design from the old cable elevated type bucket loaders, which were the T2 for the D2, T4 for the D4, T6 for the D6 and the largest was the T7 for the D7, all of which were built by the Trackson Company of Milwaukee, Wis., there were a accessory option. The HT4 was the first hydraulic loader designed for the D4, Caterpillar liked the new design so much, they bought the company in 1951 and made it a subsidiary.The D4 S/N 7U23963SP would be a 1953 tractor. Here is what was said about the letters “SP” at the end of the serial number. Caterpillar Service Reporter. (1956)
Transmission group number plates are now attached to the rear of the steering clutch case and to the transmission housing of all Caterpillar track-type Tractors, Traxcavators and Pipelayers . This plate has a number stamped on it which designates the transmission group used in that machine. If a different transmission group is purchased, the new group will include an new plate to replace the original plate. The group number as well as the machine serial number should always be referred to when ordering transmission parts. Earlier models equipped with special transmission groups were designated by the use of the Letters “SP” on the tractor serial number plates. Such a marking on current models indicates special final drive gear ratios. Some of the HT4 loaders had a High and Low reverse.
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