Abstract: An electro-mechanical shifter (80) for use with a hydraulic transmission (62) of the type employing a clutch and having first and second valve members (C, D) that in the same and opposite open and closed conditions provide at least one range of gear ratios for driving an output member such as an engine drive shaft (64). Shifter (80) includes a control arm (9) positionable by an operator along a frame (10) that includes a pin (24) operated by an actuator (32) which extends into an arcuate cam opening (22) in frame (10) operative to prevent arm (9) from being moved from a highest gear ratio of a first range of gear ratios beyond a lowest gear ratio of a second range of gear ratios without disengagement of the clutch.

Abstract: Disclosed is a mechanism for manually shifting gears of a transmission from a remote operating station control lever. The mechanism features a rotatable slideable member having a protuberance that extends through an opening in the transmission casing and is adapted to move rail members within the transmission for engaging the gear combinations desired. The slideable member is preferably connected to the control lever by flexible cables such that movement of the lever along one axis causes the slideable member to rotate so as to position the protuberance adjacent the rail member desired. In one embodiment the slideable member is pivotally mounted to a rotatable member which is preferably connected to the control lever by a flexible cable such that movement of the control lever along a different axis causes the rotatable member to rotate which causes the slideable member to slide along a defined path and move the rail member to which the protuberance is adjacent.