Pump fan control circuit and block for truck mountable hydraulic system
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United States of America Patent
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Apr 5, 2016
Grant Date -
Jul 3, 2014
app pub date -
Dec 26, 2013
filing date -
Dec 27, 2012
priority date (Note) -
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Abstract
A hydraulic fan powered in a branch of a vehicle-carried working load hydraulic circuit helps cool hydraulic fluid in a cooler. A switching block has a bypass mode which kicks in whenever sensed hydraulic fluid temperature indicates an overheat condition. The bypass mode shuts off hydraulic fluid to all the working loads of the system, while circulating hydraulic fluid as fast as possible through the cooler and running the cooling fan at a slower rate. After the hydraulic fluid cools below the overheat threshold temperature, a start button must be pressed before the switching block will again power the working loads and run the fan at a higher speed.
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