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 b. Inspection and Adjustment. To check a watertight door
b. Cleaning and Inspection
or hatch, proceed as follows:
(1) Inspect housing for cleanliness.
Allow no
(1) Trace a solid chalk mark around the knife edge of
accumulation of oil and dirt. Wash housing with fuel oil and
the door or hatch coaming.
wipe dry.
(2) Close, then dog the fitting.
(2) Place finger under air vent (when operating) and
(3) Undog, then open fitting. Inspect the watertight
check that air is escaping. If you feel none, remove vent pipe
gasket. When chalk mark has been transferred evenly with
and blow clean with ships service air. Install the vent pipe.
same general width to gasket, that fitting is watertight.
(3) Remove drain plug from lower half of housing (aft,
portside) and take a sample of oil. Inspect for presence of
c. Defective Fittings. When knife edge does not meet
water or sludge. If any, drain and fill with clean oil.
gasket evenly, adjust the dogs, or build up the knife edge until
it does meet gasket evenly.
d. Cleaning. Rub gaskets with a piece of wood that is the
NOTE
same width of the gasket, until all foreign matter is removed.
There is an instruction plate attached
e. Defective Gaskets. Replace deteriorating gaskets.
alongside the oil gage, showing "HIGH"
and "LOW" oil levels.
NOTE
Be sure that the knife edges are highly
(4) Check that oil level in gage is between HIGH and
LOW; nearer high while in operation, at high when stopped.
polished. Do not use emery cloth or
sandpaper to polish. Do not use paint on
CAUTION
the knife edges.
Make sure that added oil is clean. Do not
f. Ladders. Inspect all ladders for worn or broken treads.
take up hard on stuffing box glands, as
Report defects to general support maintenance.
this will make shaft run hot and transfer
g. Machinery Mountings.
heat to the thrust bearing.
(1) Inspect all machinery hold down bolts for security.
Replace all bolts that cannot be tightened.
(5) Remove plug in oil fill hole, and add oil, only when
(2) Report all unusual machinery foundation conditions
stopped, until gage reaches "HIGH" on plate. Install plug.
to general support maintenance.
h. Ventilation Fittings.
3-26. Propeller and Shaft
(1) Inspect all moving parts of ventilator housing.
a. General. This design 3006 tug is propelled by a three
Report worn or improperly operating parts to general support
blade, right hand rotation propeller manufactured of
maintenance.
manganese bronze. It has an overall diameter of 7.667 feet,
(2) Lubricate moving parts for freedom of movement
and a pitch diameter 5.160 feet. The shaft is a single piece of
(LO 55-1925-204-12-1).
forged steel, finished to a length of 23 feet and a diameter of
i. Anchor and Chain. Inspect and maintain the anchor and
9.500 inches.
chain in accordance with TM 55-501.
b. Stuffing Boxes. There are two stuffing boxes fitted
around the shaft. One is at the aft engine room bulkhead and
3-28. Miscellaneous Hull and Accessory Items
is known as the forward stuffing box. The other is in the aft
a. General. The tug is equipped with. three windshield
bulkhead of the void space through which the shaft runs. Flax
wipers, intercom devices, engine order telegraph indicator and
packing rings are used as a seal between shaft and stuffing
transmitters, and the eductor system. The motor driven
box.
windshield wiper is a swinging arm type with totally enclosed
c. Inspection and Adjustment.
mechanism and a 110-120 volt ac/dc motor. The engine
(1) Inspect for excessive leaking at the packing
order telegraph system has an indicator in the engine room,
gland of stuffing box (forward).
two transmitters in the pilothouse and a third at the aft
(2) Adjust to limit leakage by turning the eight nuts
steering station. The handle (1, fig. 3-28) controls pointer (3,
securing the packing gland clockwise one-quarter turn.
(3) When the packing gland can not be tightened
order by moving handle (4, fig. 3-29) to coincide with pointer
further, and the leak is still more than a drip, notify general
(3), it also moves pointer (4, fig. 3-28) to coincide with pointer
support maintenance.
on handle (1). Voice tubes are run from pilothouse to engine
room and aft steering station. The vessels telephone system,
3-27. Hull Assembly Access
a five station hook-up, is for intercommunication between
a. General. The doors, hatches, vents, windows (port
pilothouse, engine room, aft steering station, captain, and
lights) and ladders are installed on tug to provide access into,
chief engineer. An eductor
between decks and compartments, or ventilation. Many of
these fittings are watertight.
3-66
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