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 corrosion, arcing, or loose connections. Replace defective
(b) Inspect gears for chipped teeth, breaks,
contacts or fingers.
or wear. Inspect shafts for wear. Inspect bearings for flat
(3) Repair as follows:
spots, or roughness.
(a) Loosen the four thumbscrews swing the
(c)
Repair
by
replacing
defective
eyebolt out of the way, then remove cover from the master
components.
control switch.
NOTE
(b) Test movement of contacts and fingers.
Repack bearings, or pack new bearings
(c) Tag and cut out electrical power to the
in accordance with LO 55-1925-204-12-3
steering system, then disconnect electrical leads from
before reassembly.
defective contacts.
(5) Reassembly.
Assemble by reversing the
(d) Install new contacts (or fingers) then
removal procedure.
reconnect electrical leads. Tighten all screws securely.
(6) Installation. Install be reversing the removal
c. Adjustment.
procedures.
(1) Keep moving parts free from corrosion.
(7) Adjustment.
(2) Do not apply paint to master control switch
(a) Shim under gear box, on top of
shaft or the lever. These controls must operate freely.
mounting bracket, at one or more corners, to reduce strain on
(3) Keep cover fastened tightly to avoid moisture
the universal joints.
getting inside.
(b) Extend coupling over key to lengthen
CAUTION
the universal joint.
In event water leaks into switch
enclosure, do not operate the
5-100. Aft Steering Control Station
equipment until the switch has been
a. General. The after steering control station consists
thoroughly dried.
of the master control switch, engine order telegraph, and
(4) Inspect contacts for excessive burning or
one station of the intercommunicating telephone system.
wear. Smooth the excessive roughness from the copper
b. Cleaning, Inspection, and Repair.
contacts with a fine file. Replace contacts worn to one-half
(1) Keep the station clean at al times. Frequently
the original thickness.
remove cover and use low pressure air to blow dust and dirt
from the master control switch.
(2) Inspect the contacts and fingers for
Section XI. NAVIGATION EQUIPMENT
5-101. General
properties of the gyroscope in combination with the rotation of
The effective navigation equipment aboard the vessel consists
the earth and the effect of gravity produce this result.
of magnetic compass, gyro compass, and the radar system
(2) Maintenance.
Crew and organizational
with auxiliary equipment such as the radio direction finder and
maintenance for the gyrocompass is limited to fuse, lamp
the fathometer.
resistor, and capacitor replacement. Terminals and sockets
may be replaced or repaired in an emergency, and gaskets
5-102. Navigation Equipment
replaced when required.
a. Magnetic Compass.
(3) Preventive maintenance checks and services,
(1) General
The magnetic constellation type
and troubleshooting. Refer to TM 55-6605-261-15 for all
compass, located in the pilothouse, indicates the tugs
PMCS and troubleshooting procedures.
magnetic heading.
c. Radar.
(2) Cleaning and inspection.
(1) General. This tug is equipped with a radar
(a) Inspect the glass cover. If cracked,
system type AN/SPN-18.
The indicator is located in
notify general support maintenance.
pilothouse; antenna is atop the mast, and the power unit is in
(b) Keep the compass and stand clean and
a locker portside aft of pilothouse.
free of all foreign matter.
(2) Maintenance.
Crew and organizational
(c) Check amount of fluid in the compass.
maintenance of the radar system is limited to inspection,
If there is no fluid, or if the fluid is low, notify general support
cleaning, test, and adjustment. Refer to TM 11-5840-214
maintenance.
for all of the authorized procedures.
b. Gyro Compass.
(1) General.
The Mark 27 Gyro compass
contains a gyroscope controlled in a manner to make it seek
and continuously align itself with the meridian and thereby
point to true north. The
5-187
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