control means for applying hydraulic fluid to said motors for rotating said screw conveyors, for regulating the operation of the belt conveyors in the hopper truck, and for shutting off {HEAD ~ hydraulic fluid} to {TAIL ~ said motors} when the hydraulic pressure exceeds a predetermined valve 
to
control means for applying hydraulic fluid to said motors for rotating said screw conveyors , for regulating the operation of the belt conveyors in the hopper truck , and for shutting off { HEAD ~ hydraulic fluid } to { TAIL ~ said motors } when the hydraulic pressure exceeds a predetermined valve
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH