UPPER REAR DOOR CYLINDER - hydraulically opens and closes the upper rear door.
FLOW CONTROL VALVE - an adjustable valve used to smooth closing of the upper rear
door. This valve is preset at the factory and should not require adjustment.
PILOT CHECK VALVE - prevents dangerous door drop if hydraulic line ruptures.
DUMP VALVE - enables the operator to close the door if hydraulic power is lost. This is
accomplished by opening the dump valve and then shifting the BALLISTIC SHIELD
directional control valve to the down position.