Hydraulic motor or pump

Claim 1

IN A ROTARY FLUID MOTOR, A HOUSING ENCLOSING A FLUID OPERATING SPACE HAVING A FLUID INLET OPENING ADAPTED TO BE CONNECTED TO A SOURCE OF PRESSURIZED OPERATING FLUID AND A FLUID OUTLET OPENING, MEANS IN SAID SPACE PROVIDING A PLURALITY OF EXPANSIBLE FLUID CHAMBERS AND COMPRISING INTERENGAGING STATOR AND ROTOR ELEMENTS, A MEMBER AXIALLY SPACED FROM SAID STATOR AND ROTOR ELEMENTS IN SAID SPACE AND HAVING A PLURALITY OF INLET PORTS COMMUNICATING WITH SAID INLET OPENING, A PLURALITY OF OUTLET PORTS FORMED IN SAID STATOR ELEMENT AND COMMUNICATING WITH SAID OUTLET OEPNING, A PORTED VALVE PLATE NON-ROTATABLY COUPLED TO SAID ROTOR AND SO DISPOSED AXIALLY BETWEEN SAID MEMBER AND SAID STATOR ELEMENT AS TO CYLINDRICAL ESTABLISH AND BLOCK FLUID COMMUNICATION BETWEEN SAID CHAMBERS AND SAID INLET AND OUTLET PORTS FOR ADMITTING AND EXHAUSTING OPERATING FLUID TO DRIVE SAID ROTOR, SAID HOUSING HAVING AN AXIAL ACCESS OPENING AT ONE END OF SAID SPACE FOR PERMITTING INTRODUCTION AND REMOVAL OF SAID ROTOR AND STATOR ELEMENTS AND SAID MEMBER, A COVER DETACHABLY SECURED TO SAID HOUSING AND EXTENDING OVER SAID OPENING, AND SURFACE MEANS IN SAID HOUSING AND COACTING WITH SAID COVER TO AXIALLY CONFINE SAID ROTOR AND STATOR ELEMENTS AND SAID MEMBER IN PLACE.