Two-speed motor control for dual hydrostatic transmissions

A two-speed control for dual hydrostatic motors each having a rotating piston group and a swash plate inclinable to a high or low speed position of piston displacement comprising a shift lever interconnecting the swash plates of the motors operable in one direction to cause both swash plates to be shifted to one position and vice versa, a manual control member movable between high and low speed positions, and a linkage connecting the manual control member and shift lever operable upon movement of the manual control member to move the shift lever in one or the other of said positions corresponding to either the high or low speed positions of the swash plates, and wedging means acting to yieldably hold said lever in the position selected against the returning force acting on the swash plates by said piston groups including a slot formed in the shift lever at one end adjacent one motor, a swash plate control arm associated with the swash plate of said motor, guide means received in said slot connected to said swash plate control arm and another swash plate control arm associated with the swash plate of the other motor pivotally connected to the opposite end of said lever, said slot inclined relative to the shift direction of said shift lever producing a wedging action on said guide means acting to hold the swash plate control arms firmly against the returning force in either of said shifted positions of the shift lever.