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 TM 55-1925-273-10-1
0024 00
SYSTEM COMPONENTS
OIL RESERVOIR
The oil reservoir (figure 2, item 1) stores the hydraulic oil for the steering gear system.
STEERING GEAR PUMP UNIT
Each steering gear hydraulic pump unit (figure 2, item 2) consists of an electric motor, a hydraulic pump, solenoid actuated
hydraulic valves (maneuvering valves), and its own oil tank. The steering gear hydraulic pump units 1 and 2 supply the
hydraulic pressure to the rudder actuators (figure 2, item 3) that move the rudders into the commanded position.
SURGE ARRESTOR
The surge arrestor (figure 2, item 4) absorbs pressure fluctuations between the oil reservoir (figure 2, item 1), the steering
gear hydraulic pump units (figure 2, item 2), and the rudder actuator (figure 2, item 3) to prevent damage to the steering gear
system.
EMERGENCY HAND PUMP
The emergency hand pump (figure 2, item 5) provides manual directional control to the steering gear when electrical control
has been lost at the helm or auxiliary stations.
RUDDER ACTUATORS
The rudder actuators (figure 2, item 3) move the rudders into the requested position (port or starboard direction) as directed
by the helm or auxiliary control stations.
STEERING SYSTEM STARTER PANEL (PORT AND STARBOARD)
The steering system starter panels (figure 2, item 6) provide electrical power and control to the steering gear hydraulic pump
units (figure 2, item 2). The steering gear starter panels turn the steering gear hydraulic pump units (figure 2, item 2) ON and
OFF (locally or remotely).
HELM STATION
The helm station is the vessel's main steering control station and is located in the pilothouse.
SOLENOID ACTUATED HYDRAULIC VALVES (MANEUVERING VALVES)
The solenoid actuated hydraulic valves (maneuvering valves) (figure 1) receive input from the helm or auxiliary steering
stations. They respond to this input by directing hydraulic pressure to the rudder actuators (figure 2, item 3). Direction and
volume of the flow are determined by the input from the helm or auxiliary steering station.
AUXILIARY STEERING STATIONS
Auxiliary stations are used in place of the helm station to provide remote commands to the steering gear system. The
auxiliary steering stations consist of the starboard pilothouse wing station, the port pilothouse wing station, and the aft
control station.
SYSTEM OPERATION SUMMARY
The commands to move the rudder actuators (figure 2, item 3) originate from movement of the vessel's helm (wheel) or move-
ment of the helm at the auxiliary control stations. This sends a signal to the solenoid actuated hydraulic valves (figure 1) in the
hydraulic power unit. The solenoid actuated hydraulic valves direct the flow of hydraulic fluid from the reservoir (figure 2,
item 1) to the steering gear hydraulic pump units (figure 2, item 2) and to the rudder actuators (figure 2, item 3). In the event
of the loss of all electrical power, the emergency hand pump (figure 2, item 5) provides the steering gear system with hydraulic
pressure to resume steering control.
0024 00-3
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