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TM 1-1730-231-13&P
achieved, stop pump by moving S4 to OFF position. Hose is now free of air and ready to be connected to the helicopter
strut. Remove air from the two other hoses also. Regulate the flow with manual flow needle valves (8) for the respective
tall, left, or right operation. Activating and holding the toggle switch RAISE/LOWER in the RAISE position for tall, left, or
right operations, sets the respective solenoid valve (7) (L1, L3, or L5) open to allow pumped fluid to the helicopter strut
and it also energizes solenoid valve (11), shutting off the fluid flow to the oil reservoir tank (14). The toggle switch, when
released always sets in the neutral position. Activating and holding the toggle switch RAISE/LOWER in the LOWER
position for tall, left, or right operations sets the respective solenoid valve (7) (L2, L4, or L6) to allow fluid from helicopter
strut to flow to the oil reservoir tank (14). The check valves (5) do not allow any fluid to flow through them from solenoid
valve (7) (L1, L3, or L5).
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