The gearboxes series are used mainly for connecting hydraulic pumps to the energy take-offs of agricultural tractors. PTO output, standardized at either 540 or 1,000 rpm, is, in this way, increased to the best operating speeds for the hydraulic pumps. RD series of gearboxes are used to decrease hydraulic motor speed.
ML and B series gearboxes supply the connection for hydraulic pumps to low rate tractor power remove. The standard power remove velocity of 540 rpm, can be increased by the gearbox ratio to optimum speed conditions required for the pump. Different inputs are approved under Hydraulic PTO Drive Gearbox Spped Increaser condition that the output speeds don't go over 3000 rpm.