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 (b)
Examine valve piston for wear, or
5.110. Whistle/Horn System
excessive play in valve. Replace a worn or defective valve
a. Air Whistle.
piston.
(1) Removal.
(c) Check valve spring for deformation,
(a) Shut off air valve at whistle tank.
breaks, or weakness. Replace a defective spring.
(b) Disconnect air line (fig. 5-136) from valve,
(d) Inspect diaphragm for loose fit, or other
then disconnect lanyard from lever.
deformation. Replace a defective diaphragm.
(c) Remove four nuts, lockwasher, and bolts
(4) Reassembly.
Assemble by reversing the
securing air whistle to mounting bracket, then lift air whistle
removal procedure, using new gaskets and 0 rings in all
off the bracket.
positions.
(2) Disassembly.
(5) Installation. Install by reversing the removal
(a) Unscrew the two air whistle bells from the
procedure.
diaphragms.
b. Whistle/Horn.
(b) Loosen clamp screws, then remove
(1) Removal.
diaphragms from the frame.
(a) Tag and disconnect electrical leads (fig. 5-
(c) Unscrew pilot valve from frame.
(d) Remove valve cap, then remove valve
(b) Remove bolt, lockwasher and nut, then
spring and valve piston. Remove the valve cap gasket.
remove the electric horn.
(e) Remove pin securing lever to the pilot
(2) Installation. Install by reversing the removal
valve, then remove lever.
procedures.
(3) Cleaning, inspection, and repair.
(a) Wash all parts in clean fuel oil and wipe
dry.
Section XVI. LIFE BOAT DAVIT
(1) Lubricate lifeboat davit and handling
5-111. General
equipment in accordance with LO 55-1925-204-12-1.
The life boat davit is the single radial arm type H2O,
(2) Clean davit and associated equipment
manufactured by the Welin Davit and Boat Division of
frequently, to prevent buildup of dirt, grease, or grime.
Continental Copper and Steel Company. It has a bevel gear
b. Inspection.
mounted with a gear ring for hand turn-out and turn-in. The
(1) Inspect condition of wire rope on winch drum
bevel gear assembly is mounted on the davit pedestal. The
and hoisting tackle for broken strands, or kinking. If broken
hoisting winch (hand crank) is secured to the davit arm. It
strands, or kinks, notify general support maintenance.
has a 1,750 pound working load, and is equipped with a hand
(2) Inspect teeth in ring gear of davit, and bevel
operated manual brake for lowering the life boat. Turning the
gear of turn-out assembly for broken or chipped teeth. If teeth
hand crank on hoisting winch will lift the boat free of stowage,
are broken, or show evidence of excessive wear, notify
and operating the turn-out will swing the boat free of the
general support maintenance.
vessels side. By releasing the locking pawl on the hoist
(3) Inspect weldment of wire rope fair lead
winch, the boat can be lowered away by means of the
(mounted on davit arm) for cracked weld, and bent or binding
handbrake. The hoisting tackel consists of a six inch double
sheave. If noted, notify general support maintenance.
sheave with an upset swivel shackle at davit head and a six
inch single sheave with becket and a Raymond quick-release
hook.
5-112. Lifeboat Davit
a. Maintenance.
5-197
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