Patent ID: 7380490

Claim:
A rotary hydraulic machine having a housing including a casing, a rotary group located within said casing and including barrel rotatable in said housing and having a plurality of pistons axially slideable in cylinders in said barrel, and a swashplate assembly to engage said pistons and induce reciprocation thereof as said barrel rotates to transfer fluid between a pair of ports, an actuator acting upon said swashplate to adjust the disposition thereof relative to said barrel and thereby adjust the stroke of said pistons in said barrel, and a valve to control flow to said actuator in response to control signals obtained from a control circuit having at least one sensed input thereto indicative of a parameter of said rotating group, said control circuit being located in a control housing secured to said casing and having an inwardly directed surface extending across an aperture in said casing to seal said aperture, a sensor assembly located on said surface and operatively associated with said rotating group to sense said parameter.