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 c. Cleaning, Inspection, and Repair of Windshield
Wipers.
remove cover and face (2)
(1) Remove screws (18) and cover (17).
NOTE
(2) Remove dust or dirt by use of ships
Cable portion of telegraph system
service air,
seldom requires replacement, but
(3)
Inspect motor for worn brushes.
when replacement is required, be sure
Replace defective brushes. Replace a defective motor.
a line, strong enough to pull cable
(4) Replace a defective variable resistor.
back into position, is attached to end
NOTE
of cable being withdrawn, and pulled
The wiper arm hinge pins should be
through pulleys as the cable is
oiled semiannually.
withdrawn. If cable being replaced is
NOTE
broken, you must connect the broken
There is a felt blade for use during
ends together in order to pull both
freezing conditions.
pieces out of the same end.
(5) Replace a defective wiper blade.
(7) Remove screws securing the inspection
d. Installation of Windshield Wiper.
plate (5, fig. 3-28) to column, then lift plate from column.
(1) Position wiper against foundation. Use
Position handles (1) until the sleeves and cable ends are
filler pieces (spacers) to keep housing in position so that
visible. Disconnect sleeve from chain. When a cable
swing of blade is parallel to glass at several points in its
requires replacement, attach a line to cable end, one
arc.
(2) Install bolts (20) and secure with nuts
that is capable of threading a new cable
(19).
(8) Disconnect chain (1, fig. 3-29) from
(3) Remove tags, then reconnect electrical
sleeve, being sure that cable end is that loosened
leads. If blade swing is improper, adjust as in e. below.
above, then withdraw cable and line from its housing
(4) Install cover (17) and secure with screws
(9) Attach a new cable of correct length to
(18).
line securely, and pull line out of transmitter column (fig.
(5) Turn on power at electrical power panel.
e. Adjustment of Windshield Wipers.
(1) Remove screws (18) and cover (17)
position with out attaching to chain at this time.
from windshield wiper.
Remove other cables in a similar manner as required
(2) Remove pin(5) and rod (4) from disc
(10) Unhook bell trip spring from its hook,
(6). Position pin (5) and rod (4) into an adjacent hole in
then lift out of indicator housing. Lift chains out of
disc (6).
transmitter and indicator housing
NOTE
(11) Clean, inspect, and repair all parts as
The holes in disc are eliptical around
follows:
the pivot pin. The hole farthest from
pin will provide arm with its maximum
(a) Use ships service air and blow dust
arc.
and dirt from the housing
(3) Install cover (17) on housing and secure
(b) Inspect and test the lamp. Replace
with screws (18).
a defective lamp
(4) Adjust blade speed by turning rheostat
(c) Clean and inspect the rheostat.
clockwise to increase speed, counterclockwise to
Test operation. If rheostat operated improperly before
decrease.
removal, replace it with a new one
f. Cleaning, Inspection, and Repair of Engine
(d) Wash chains and trip springs in
Order Telegraph. Partial disassembly of telegraph
clean fuel oil and blow dry with ships service air.
transmitters and indicator are required to perform crew
Inspect bell trip springs for breaks, bends, or weakness
maintenance. Proceed as follows:
Replace a defective spring
(1) Remove screws from clamping portion
(e) Inspect chains for excessive wear,
of handles (1, fig. 3-28) 'then remove handles from
bends, or binding links. Replace a defective chain with
shaft.
one of exactly the same length
(2) Remove screws, then remove covers (2
(12) Replace all parts by reversing the order
and 7) and face (3)
of removal in steps (1) through (10) above, adding a thin
(3) Remove lamp from socket inside the
film of oil on chains and sprockets. Tighten turnbuckles
transmitter
until cables are taught, but not too tight
(4) Tag and disconnect electrical leads from
(13) Test the operation of all stations for the
rheostat (6). Remove knob and locknut, then lift
sound of bell and position of handle pointer to the same
rheostat from housing
order. Test the engine room acknowledgment pointer
(5) Unhook the bell trip spring and bring it
for alignment with order pointer at all stations
out of the housing
(14) Adjust any pointer deficiencies by
(6) Remove clamping screw from handle (4,
backing off locknuts on turnbuckle at ends of affected
control cable (s) and shorten or lengthen
3-71
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