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 (1) Starting, or shifting to hand steering control.
(2) Stopping the steering system.
(a) Stop steering system by pressing STOP
(a) Move rudder to amidships (0 degrees
push switch on controller.
on angle indicator).
(b) Align steering system by opening the
(b) Stop steering motor (6) by pressing
two valves at base of steering console (1).
STOP push switch on controller.
(c) Place steering wheel in AFT position.
(d) The tug can now be steered by using
b. Steering System Trick Wheel Operation.
the hand pump in steering console (1).
(1) Starting, or taking control on trick wheel.
(a) Check the two valves at base of steering
NOTE
console (1) and the bypass valve at steering unit to
assure they are closed.
The rudder angle indicator will not
(b) Ascertain that rudder angle indicator on
function while operating by hand
the steering console (1) indicates 0 degrees.
steering controls.
(c)
Place steering wheel (2) in AFT
position.
(2)
Stopping, or shifting to electro-hydraulic
(d) Disengage the shaft clutch. (This is
control.
done primarily to reduce the effort required to turn the
(a) Move rudder to amidships position.
trick wheel).
(b) Place steering wheel (2) in the
FORWARD position.
NOTE
(c) Close the two valves at base of steering
When running, and control is being
console (1).
shifted to trick wheel, the next step is
(d) Start the steering unit by pressing
START push switch on controller.
unnecessary because motor (6) will
be running.
d. Aft Steering Station Operation.
(1) Steering at aft steering station.
(e) Start the electro-hydraulic steering unit
(a) Engage aft steering station by pushing
by pressing the START push switch on controller.
the steering gear switch (2, fig. 2-3) START push switch.
(f) The tug can now be steered from engine
(b) The tug can now be steered from the aft
room by using the trick wheel.
steering station by using a lever movement of steering
(2) Stopping, or returning control to steering
control handle.
wheel.
(a) Move rudder to amidships position.
2-15. Compressed Air System Operation
(b) Place steering wheel (2) in the
FORWARD position.
a. General. The system consists of the piping,
storage tanks, and control valves used to store and
CAUTION
deliver air from compressors to the using equipment.
It is absolutely necessary that rudder
Pressure is delivered from system as follows:
and steering wheel (2) be at
(1) 250 psi available for starting, stopping, and
amidships position prior to the
reversing the propulsion engine.
engaging of shaft clutch.
(2) 100 psi for' operation of the whistle and
pneumatic tools.
(c) Engage shaft clutch.
(3) 50 psi for ships service air and sea chest
blowdowns.
NOTE
If control is being returned to the
steering wheel (2) do not stop the
the compressed air system piping diagram, and gives
steering unit.
function, location, and label description for each valve in
the system. Table 2-11 lists the various operations to
(d) Stop steering unit by pressing the STOP
be performed and the valve positions and procedures
push switch on controller.
necessary to accomplish them. This table is also keyed
c. Hand Steering, Pilothouse Control.
to figure 2-14.
2-35
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