540
AUXILIARY EQUIPMENT ON BOARD
Studio ti 03312 540-04usa
72
5
5.1 HELM SYSTEM
The hydraulic power-steered helm system has
been provided to make driving easier when
underway, and to improve the safety and reliability
of the system.
Hydraulic power steering uses the ship’s engines to
provide the “power” for the steering system, via an
engine or electric motor driven hydraulic pump (1).
In the engine room there is the heat exchanger (2)
for system cooling. A manual hydraulic steering
system, consisting of a standard helm and a
hydraulic steering cylinder, (fitted with an integral
servo cylinder and a power steering valve) supplies
the “control” portion of the steering system.
Under normal conditions, with engines running, a
hydraulic oil supply is in a stand-by mode, ready to
be directed to the steering cylinder as dictated by
the steering wheel, servo cylinder and power
steering valve.
Turning the steering wheel left or right makes the
system go from stand-by into operating mode and
move the steering cylinder accordingly.
In the event of a power source failure, hydraulic oil,
from the steering helm, is automatically diverted
directly into the servo and steering cylinder,
providing the helmsman with manual back-up
steering.
An engine room mounted oil reservoir allows easy
system fill and assists the in-line oil cooler in cooling
the hydraulic oil. An in-line oil filter helps to protect
the steering system components against
contaminants.
Rudder
Reservoir and filter
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