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 TM 55-1905-220-14-7
3-203.
STEERING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
d. Directional Valve.
The directional valve is a solenoid-operated valve which controls the flow to operate the rudder-
positioning cylinders. This valve is electrically controlled from the external electronic control amplifier. The
solenoids of the valve are de-energized if the rudder limit switches are activated.
e. Brake Valves.
Brake valves lock the cylinders into any position when no changes are being ordered. This valve is set
at installation.
f.
Cylinder Relief Valves.
(1) The cylinder relief valves are connected across the lines that link the pump unit to the rudder-
positioning cylinders. These valves limit pressure build-up as a result of an object striking the rudder by
allowing the rudder to move even though the brake valves are closed. This prevents damaging the steering
gear.
It is very important that all hydraulic lines and components be
free of foreign matter before the hydraulic system is operated,
so as to ensure trouble-free operation and to keep wear of the
system to a minimum.
(2) In addition, the steering system contains a Heading Selector, a Remote Magnetic Heading
Compass, an Emergency Steering System, and a Ships' Course Indicator.
3-3182
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