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Oliver OC-9
The Oliver OC-9 was the first tractor crawler by Oliver Farm Equipment Company to employ the use of a torque converter. Along with the OC-96 variant, this model was introduced in 1959 as the final model in the OC series,〔 marking a significant advancement in the company's technological standards.
The bulldozer originally sold for approximately . A valuation guide published in 2001 listed the current value of an OC-9 crawler in excellent condition as .
==Powertrain==
Over its lifetime, the OC-9 had several different models of engines, both gasoline powered and diesel powered.〔 In 1960,〔 the crawler was fitted with a 4-cylinder, , 62 hp Hercules diesel engine.〔 The same year, the OC-9 introduced Oliver's Trans-O-Matic power-shift transmission, the case made of cast alloy steel.〔 The hydrostatic transmission allowed for on-the-go changes between high and low ranges and also the ability to have one drive sprocket in forward and the other in reverse, something not possible with clutch type crawlers. The transmission, along with power steering and instant reverse, made the crawler easily maneuverable.〔 While a conventional clutch type bulldozer only allows for the engine's ''kinetic'' torque to be transmitted to the ground, a converter type set up allows the engine to build ''static'' torque and transfer more power to the ground.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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