The sensitivity to problems with the tolerances on the turret ring would make this drive more likely to fail from minor damage that the Oilgear unit would shrug off.Westinghouse: The Westinghouse unit was just a big electric motor hooked to reduction gears. This unit was so similar the electric motor powering the hydraulic pump and turbine used the same reduction gears as the Oilgear unit.The Logansport unit used the same mounting bracket as the Oilgear unit as well. The whole assembly was small enough to be mounted to the side of the turret, with a fair amount of room for the gunner.Logansport: This Turret drive was very similar to the Oilgear unit, just not as precise, nor as good at dealing with imperfections in the turret race or ring. The Oilgear traverse system and gunners station in an M4A2 76 HVSS tank The Oilgear Traverse System, and foot pedal triggers, and elevation wheel in a restored M4A2 76w HVSS tankThe Oilgear unit was hydraulic but powered by its own electric motor that spun a hydraulic pump and turbine setup to rotate the turret. Oilgear could not keep up with all the factories producing Shermans, so they had to go to other companies.
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