Patent ID: 6696960
Filing Date: 2004-02-24
Classification: A01D,B60T,G01M

Abstract:
A hydraulic system of the type comprising:a hydraulic fluid reservoir; a hydraulic circuit assembly comprising lines and hydraulic components, at least two of the hydraulic components and the reservoir fluidly coupled to one another by the lines, the hydraulic components comprising: a hydraulic pump; a hydraulic actuator comprising a cylinder, defining an interior, a reciprocating piston within the interior dividing the interior into first and second regions, and a first shaft extending from the piston, through the first region and out through a first opening in the cylinder; and hydraulic valving selectively coupling the pump and the reservoir to the first and second regions so to selectively drive the piston and the shaft therewith; and hydraulic leak warning apparatus, fluidly coupled into the hydraulic fluid reservoir, constructed to provide a signal indicating a possible hydraulic fluid leak, the improvement comprising: means for compensating for changes in the volumes of fluid within the first and second regions as the piston moves within the cylinder so that actuation of the hydraulic actuator has no effect on the fluid level within the reservoir.