the brake 102 and clutches 64 and 66 if the oil pressure sensor 158 indicates less than adequate oil pressure in the housings 74 or 76 of the clutches 64 and 66 via conduit 159 the oil valve 130 will be positioned by signal from the sensor 158 to maintain the brake 102 actuated to prevent a falling runaway condition contact between the ammeter needle 162 and one of the adjustable contacts 164 or 166 of the ammeter 156 energizes the valve 130 in one direction or the other to send pressurized oil from the reservoir 134 via the pump 112 to either the brake 102 or alternatively to one of the clutches 64 or 66 the electric motor 44 is preferably run continuously through the operation of the pump assembly 10 the position transducer monitors the angular displacement of a selected shaft 52 and signals when a selected interval of displacement has been obtained by that shaft at which point a signal is sent to the valve 130 to actuate that valve into cutting off the flow of oil to the brake 102 to actuate the brake 102 the ammeter needle 162 will move in response to the increased resistance to current flow until the needle 162 contacts the.