PS Magazine - JULY 1972
PS, The Preventative Maintenance Monthly
1972 SERIES, ISSUE 236
JULY 1972
i,
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I
1-
EASY DOES IT
Take the tail rotor drive shaft.
you're replacing a bearing due ±o loss of
lubricant, indicated by roughness or
seizure, you have to pUt the new one back
just so. Otherwise, you'll ruin the bear-
ing, collar, hangeR²even the shaft.
your way down to the smaller shims,
following³ the beaRing fitting limits and
the coupling bolt nut torque info in the
pUB.
´hat seCµup will give you the right
amount of shims so Chat the bearing will
aline properly wi¶h the shaft during the
ground run·in.
( ±)²
Put Ihe shaf¶ in your bird according to
the poop in ¸hap
7
of TM
55-1520±228²20
(Oct
70).
Shim ¶he bearing into the hanger in
your hand, before you put it on the shaft³
An improved hanger, FSN
3130²173³
2303,
is in the works. ¹t has a stud anD
spring
setº up.
No
shims needed³ An im-
proved bear»ng, FSN
3110²´68µ´471,
wi¶h a
new seal is also »n tHe
works.
NO SOLVENT³ PLEASE!
¹f¼ during
inspections, you find that some lube
has worked out of
a drive½shaf¶
bearing, don't sWeat it³ The bearin
g is probably OK¾
Never wipe
off the excess
¿
_
fÀom that permanentl
y lubed beaRing¾
BEARING AND SHAFT ALinED?
The expe
lled grease acts as a seal so never use
a water Áressure
spray on the
bearing or hanger Moisture under
the bearing collar
can corrode
the drive shaft and ruin the bearing.
A good way
to check an installed bearing is
to disconnect and
rotate the drive
shaft by hand. ¹f the rÃlling e
lements come to a
definite stop
²then jÄmp, with a corresÅÃnding
increase in roughÆ
ness, the bear
ing has Had it.
I
±,
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