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TM 10-3930-643-20
GENERAL MAINTENANCE PROCEDURES.
2-11.
Lubrication. Refer to LO 10-3930-643-12 for detailed,
i l l u s t r a t ed
instructions on proper lubrication. Some general practices to remember include:
a. Use the correct lubricant.
b .
Keep lubricants clean.
c .
Clean all fittings prior to lubrication.
d .
Lubricate clean disassembled and new parts to prevent rust.
2-12.
Application of Adhesives.
Liquid gasket, silicone rubber adhesive
and
Loctite retaining and sealing compounds are recommended in some tasks to ensure
and strengthen seals.
The following procedures describe their correct use and
application:
a.
Liquid Gasket.
Can be used on machined surfaces (where no gasket is
specified), ground joints and threaded connections.
It can also be used with
all types of gaskets.
Liquid gasket is heat and cold resistant, unaffected by
low pressure gases, gasoline, oil or other liquids, and prevents seizure.
TOXIC/FLAMMABLE
Liquid gasket is toxic and flammable. Use only in well ventilated
areas. Avoid contact with eyes or skin. If
injured,
seek
medical
attention immediately. DO not allow near open flame, heat or
sparks.
Do not smoke when working with liquid gasket.
Liquid gasket is applied as follows:
(1) Thoroughly clean the mating surfaces. Surfaces must be free of
grease, paint, rust or any other foreign substance.
(2) Brush each mating surface with a thin, even coat of liquid gasket.
(3) Allow 10-20 minutes to dry until tacky. Temperature and humidity
will affect drying time.
Adhesive is correct consistency when it does not
transfer to finger when touched.
(4) Press surfaces together.
Ensure full contact between surfaces. Do
not pull or pry either surface after mating.
b.
Silicone Rubber Adhesive.
Except for the instrument panel which is
sprayed with anti-corrosive varnish, all electrical connections
are
sealed
against moisture with a room temperature vulcanizer silicone rubber
sealant,
MIL-A-46146A Type 1.
If you must break into this seal for repair work,
you
must remove the switch involved completely from the machine
and
thoroughly
clean all existing sealant and dirt that may remain on switch,
R e p l a c e t he
switch if corroded.
The sealant must have a clean surface to adhere to or
there will not be an effective seal.
After switch is cleaned and reassembled
or replaced, apply sealant.
Cover the switch and terminals
completely
with
sealant.
Press sealant into and around the terminals to ensure
complete
coverage.
Sealant will set in 15-30 minutes depending on temperature and
humidity.
2-7
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