In a propulsion unit having a hydrostatic drive, a pair of pedals 14 are clamped to the axle 12 in such a manner as to be comfortably positioned for the feet of the operator. The angular position of each pedal 14 relative to the axle 12 may be adjusted such that the two pedals 14 may have different angular orientations if desired. One pedal 14 may be comfortably positioned for directing forward motion of the vehicle while the other may be more comfortable for reverse motion. Set screws 16 are accessed through holes 14a in pedals 14 from above.