Dependent latching system for a transmission

摘要: In machines such as hauling units having electro-hydraulic transmission controls, it is desirable to ensure that in the event of an electrical malfunction or power failure remains one its gear ratios. subject invention, a dependent latching system provided which latches existing ratio within at least two gears This accomplished by providing master latch valve mechanism, logic arrangement, and shuttle act cooperation with electrically controlled proportional hydraulic controls engagement plurality hydraulically actuated clutches. The mechanism directs pressurized fluid from source through urge open position. malfunction, arrangement functions sense engaged clutches flow respective ones valves maintain operative gears.