Abstract: A vehicle includes a variable speed hydrostatic transmission which drives through a gear transmission, having selectable gear ratios, to provide propulsion power to a pair of drive wheels. The hydrostatic transmission is used as a brake to supplement the braking ability of the vehicle. The gear transmission is provided with a positioning plate which is mounted for pivoting between respective positions corresponding to different transmission gear ratios in response to a gear shift lever being moved between corresponding positions. Provided for ensuring that the gear transmission is not shifted to neutral while the vehicle is in motion, and the consequent loss of the ability of the hydrostatic transmission to provide braking, is a blocking arrangement, including a vehicle motion responsive sensor, that operates to prevent the movement of the positioning plate, so long as the vehicle is in motion.

Abstract: In a single lever control for the feeder conveyors of a combine harvester, movement of a manually operated lever directly actuates a drive train for driving the conveyors in a forward or normal operating direction. A second lever controls actuation of a drive train for driving the feeder conveyors in a reverse direction. Movement of the second lever is responsive only to movement of the first through a cam slot and cam follower arranged so that selection of the drive for one direction automatically disengages the drive for the opposite direction. A detent gate at the neutral position forces the operator to pause when passing through the neutral position, that is when disengaging one drive and engaging the other.