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 TM 55-1905-222-14
b.
When the wheel is stationary, all the hydraulic oil supplied to the helm unit is returned to the hydraulic
reservoir through line (4). When the helm is turned clockwise, the helm unit delivers hydraulic oil through line (3), the
port counterbalance valve, and the lower Isolation valves, to the starboard side of each steering cylinder The. resultant
clockwise torque positions the rudders. The hydraulic oil which Is discharged from the port side of each steering cylinder
passes through the upper isolation valves and the starboard counterbalance valve through line (2) to the helm unit before
returning to reservoir via return filter. When the wheel is turned counterclockwise, line (2) supplies the cylinders and line
(3) relieves the cylinders to put a counter-clockwise torque on the rudders
c.
The four bypass valves are normally closed but may be opened to drain the cylinders through line (5) to
permit emergency steering. If a malfunction renders the engine driven pumps inoperative, the helm unit is capable of
supplying Itself with hydraulic oil from the reservoir as the wheel Is turned. Under this condition the suction is through the
check valve and line (6)
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