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A tracked loader or crawler loader is an engineering vehicle consisting of a tracked chassis with a front bucket for digging and loading material. The history of tracked loaders can be defined by three evolutions of their design. Each of these evolutions made the tracked loader a more viable and versatile tool in the excavation industry.
The Oliver OC-9 was the first tractor crawler by Oliver Farm Equipment Company to employ the use of a torque converter. [2] Along with the OC-96 variant, this model was introduced in 1959 as the final model in the OC series, [1] marking a significant advancement in the company's technological standards.
In 1950 Marc Rojtman purchased the crawler manufacturing from Warren, Ohio based Federal Machine. He purchased a building in Churubusco, Indiana, to house his company and relocated the operation there. Working 15‑hour days along with his employees allowed ATC to grow by 1951 to $3 million in sales. [1]
In late 1957 (diesel) and early 1958 (gas) OC-4's came equipped with 3 cylinder Hercules 130 engines. Most noticeable was the change to a 'beefier' more industrial front grill. In 1962 at the new Charles City, Iowa, crawler production line, the last incarnation of the OC-4 was produced. It was a sturdier industrial model named the Series B.
Carr Hill also assembled Lodestar trucks in the mid/late 1960s. The Wheatley Hall Road factory also produced agricultural crawler tractors BTD5/BTD6/BTD8/BTD20 in red as well as yellow CE bulldozer and loader versions. Wheatley also produced backhoe loaders (3400/3500/260) and Payloaders H25/500 Payloader/H30/H50 & H65.
Euclid produced crawler wagons on tracks (similar to Athey Wagons) known as Euclid Tu-Way haulers. The crawler track speed restriction was a problem, and the next version used steel wheels for improved speed. George Armington Jr was a keen hydraulics designer, and produced the first hydraulic Euclid dumpers circa 1930.