Power came from a naturally-aspirated 50 horsepower Caterpillar D311 4-cylinder diesel which was connected via oil clutch to a 4-speed manual transmission. It featured a one cubic yard bucket with integral loader frame built into the chassis making for a substantially stronger unit, and was fully hydraulic in operation. 933 series C Traxcavator”, (in deference to Trackson), the 933C was a purpose-built track type loader, not an adaptation of an existing machine. Next off the production line was the 933, after Caterpillar decided that both tracked and wheeled loaders needed their own number series (900) to differentiate them from their standard track type tractors. It was an immediate success and spurred on further development within the loader division. This, like the HT4, was all hydraulic and based on a contemporary D6 chassis (in this case a wide gauge D6-9U series). It was also Trackson’s first all-hydraulic front end loader and was released in 1950.Ĭaterpillar knew it was on to a very good thing with the purchase of Trackson and immediately started refining some of Trackson’s ideas once the integration of the company was complete.Ĭaterpillar followed up Trackson’s HT4 with its own model No. While very effective, Trackson’s loaders did have their limitations and the closest that Trackson got before Caterpillar took them over was the release of the model HT4, based on a wide gauge Cat D4-7U series, which addressed a lot, but not all, of the issues inherent in the design. Prior to the buyout, Trackson had been working on a project where the loader was an integral part of the track-type tractor and not just an “add-on”.
However, its star offerings were pipelayers and front end loaders. Trackson had been founded in 1922 in Milwaukee, Wisconsin, and built a plethora of attachments for not only Caterpillar but other manufacturers as well. Following the acquisition of the Trackson Corporation by Caterpillar in 1951, Caterpillar continued to use Trackson’s loader attachments fitted to D2, D4, D6 and D7 tractors.
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