Consider a wheel loader or an excavator. Pascal's Law, which declares that pressure exerted on an enclosed liquid is transmitted undiminished in all directions at once, has been put to the test performing different functions throughout those machines. Regardless of whether hydraulic fluid is being used to operate a cooling fan, articulated steering, or to propel the machine around the jobsite, the equipment doesn't start earning its keep until the bucket takes a bite out of a rock pile or a construction site. When that happens, an actuator converts the hydraulic pressure into mechanical force and motion.
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