then operates controls c1 c3 to lower the pick up broom 29 into operative sweeping position and directs hydraulic fluid into the hydraulic motor 31 of the pick up broom 29 the hydraulic motors 34 36 and 38 of the paddle wheels 42 44 and 46 and the hydraulic motor 40 of the blower 48 the pick up broom 29 and paddle wheels 42 44 and 46 are thus driven in the direction indicated by the arrows in fig2 and the blower 48 creates an updraft through the elevator housing at a low rate of about 3 5 feet per second to aid in lifting leaves or the like through the housing 50 and direct them to the rear of the hopper 28 as the sweeper 22 is driven over the surface being cleaned the pick up broom 29 forms a pile of debris in front of the broom and then slings the debris into the lower end of the elevator housing 50 which is about 5 25 inches above the surface being cleaned the propelling portions 81 of the lower paddle wheel 46 then engages and propels the debris directly into the hopper or to the next paddle wheel 44 which propels it to the upper paddle wheel 42 which slings it toward the rear of the hopper 28 the debris movement through the housing 50 is aided by the blower 48 which causes movement of air therethrough if the vehicle is driven over a curb or speed bump which engages the lower end of the.