Abstract: A transmission control linkage for positioning elements in a transmission housing in response to selector movement between at least four positions, and characterized in that two different selector positions correspond to the same positions of the elements in the housing. The linkage typically has three links, including a first link, a second link pivotally connected to the first link at a primary pivot, a third link pivotally connected to the second link at a secondary pivot; a linkage carrier means; and the first and third links pivotally mounted relative to the carrier means at tertiary and fourth pivots for causing the third link to rotate counterclockwise through an angular range .alpha. and then to rotate clockwise through an angular range .beta., in response to counterclockwise rotation of the first link through an angular range .alpha..

Abstract: An apparatus for positioning a work implement in predetermined operative attitudes, including a valve body mounting a piston which is operable for movement through a range of selective operative positions, and which is further connected to the work implement; a pair of pulse valves mounted on the valve body and connected in fluid communication with the piston and operable selectively to supply a source of hydraulic pressure to the valve body; and an actuator is connected in signal transmitting relation to the pair of pulse valves and is adapted selectively to actuate same thereby causing the selective release of hydraulic pressure to position the piston, and thus the work implement in a selected operable attitude.

Abstract: A foot operated control device including electrical force sensing devices functional to sense forces applied to the control device and to produce electrical signals proportional to the force applied, the electrical signals being adapted to operate electrically responsive hydraulic control valves.