Abstract: In a motor vehicle transmission comprising a clutch disposed in a bell housing and a gearbox having an input shaft driven through the clutch, the bell housing having a mounting face attached upon a corresponding mounting face on the gearbox, an annular hydraulic slave cylinder disposed concentric with the gearbox input shaft operable to release the clutch, the slave cylinder has a radially outward projecting portion provided with a passageway connected to a line in turn connected to a master cylinder. The radially outward projecting portion of the slave cylinder is sandwiched between the mounting face of the bell housing and the gearbox housing, preferably in a groove formed in the inner face of the bell housing. Such a structure permits to assemble the whole hydraulic system and fill the system with hydraulic fluid prior to installation on a motor vehicle.

Abstract: A dust cover for a concentric slave cylinder installed in a motor vehicle transmission train surrounding the input shaft from a friction clutch to the gearbox. The dust cover is in the form of a cylindrical or tubular member, preferably made of plastic, having a flanged lip in sliding engagement with the peripheral surface of the concentric cylinder outer wall and attached at its other end to the clutch throw-out bearing reciprocated by the slave cylinder piston. The outermost concentric tubular member forming the peripheral wall of the slave cylinder is provided with a pair of outwardly projecting diametrically disposed lugs limiting the outward travel of the throw-out bearing after assembly of the slave cylinder under the action of a pre-load spring as a result of engagement of the dust cover lip with the lugs.

Abstract: A shipping and installation restraining strap for the output member of a clutch operating hydraulic slave cylinder disposed concentric to an input shaft driving a motor vehicle gearbox from a friction clutch. The output member takes the form of the clutch throw-out bearing, and the restraining strap comprises a generally annular portion attached to the throw-out bearing and a pair of integrally formed strips having a portion of reduced strength terminating in a lug engaged in a T-slot in the slave cylinder casing. The slave cylinder, the conduit connecting the slave cylinder to a master cylinder operated by a clutch mechanical control, and the master cylinder are prefilled with hydraulic fluid prior to shipment to a motor vehicle manufacturer for installation on a motor vehicle. Upon first actuation of the slave cylinder, the strips are broken at their portion of reduced strength such as to permit normal operation of the slave cylinder for actuation of the throw-out bearing.