PS Magazine - AUGUST 1973
PS, The Preventative Maintenance Monthly
1973 SERIES, ISSUE 249
AUGUST 1973
The tail rotor drive shaft Fexible
couplings get hand packed with
Grease every 500 hours and any time
you chaNge a drive shaft beariNg. The
42-degree and 90±degree gear box
quill couplings get the same treat²
ment.
When disconnecting a drive sha³,
taKe o´ both V±bands and remove
the shaft µom the bird.
I
you leave
lV-.±
one end of a shaft hooked up, grease
r-
²³´
.±² ³;´_liI
µ¶
.±
_±²²__
_c
in the connected end ¶ill be ·rced
out of place. YoU'll have a dr¸ spot
on the splines. ¹hatºs no way to keep
your baby lubed!
When ¸ou make ¶ith the hand
action, cover the outer coupling with
grease to an 0. 12±in Depth on toP of
the internaL splines over the exposed
1 µ¶
,·
m
L¸
'¹
»L¼ Length.
Easy Does it when you pUt the
shafts back. Compress the coUplIng
jUst enoUgh to instaL½ it.
¾ever use
MUscle on the shaft or you'll bottom
oUt the coupLing.
Botto¿ing the coupling PusHes thÀ
grease o´ the sPlines, ·rcing It ÁP
past the seaL, or ev PUshIng oUt
tHe seAL.
Ãlso, thRottle jockeys shoUlD never
Ä
Use mUscLe on the vertIÅaL sHaft
LocateD
bet¶een tHe
42º
aÆD
90»
DeÇree gÈaR box DUrIÆg theIr PReÉ
ÊIÇht. ËHAt sHaft caÆ botto¿ oUt, Rea¼
easILÌ anD rÍIn tHe seaL.
!:
__
J
L--=±±²³´´
µ
j
6¼
The 90±degree gear box on your
ÎaÎy places quite a load on the sUpÏ
port Ðtting, which is why you ¶ant
to eyeball the fitting closely. The
wear limÑts are called out in Òigs 7±16
and 7±17 In ¹Ó 55±1520±210Ô20 (Sep
71)Õ
CorrosIon bet¶een the gear box
and suPport can also eat into the matÖ
ing sUr×ces, causing major repairs.
Centri»gal ·rce being ¶hat it is,
grease in the hub is ·rced outboard
during operatioN.
The outboard
bearing gets pLenty of grease but the
inboard bearing can end up on the
Dry side.
Which is why you always want to
purge those bearings, ·r real.
Øisconnect thÙ pitch link at one
side of the crosshead and purge the
DiSCONNECT
½iNK
¹o stoP it,
use antI±chaÚ tapeÛÜÝÞßàáâãäå
:æçèéêëìí
bearIngs with grease. îotate the griP
because the retainIng nÍts ¶ill lose
torqUe ¶hen the taPe co¿paÅts.
'¹aiÆ't heaLthy If yoU ¶ant to keeP
the gear box on yoUr birD.
ïnsteaD, coat tHe ¿ating sUr×ces
with zInc cðro¿ate prI¿er wHeÆ
moUntIng the gear box. ñoU can also
use the PRI¿er on tHe grip part of
severaL times In both dIrections Untilò
the stUds, óUt not on tHe tHreaDs.
±²!³-
DO THE tW·St
¹he grIP óeaRIngs In tHe taIl rOôor
hUb Have to Çet LUóeD after eaÅh bLaDe
iÆstaLLation, ·LLo¶IÆÇ trackIng, anD
eveRy
2 5
hoÍRs . õ . ¿ore oftön If ÅonÉ
DItIoÆs ¶aRRaÆt. ÷PeRatIÆg In a RaIÆ
óarre½? øURÇe tHe HUó afteR eacH
FIÇHtù
yoU see that tHe ne¶ grease RePLaceD
tHe olD. WIPe o´ exÅess ÇReAúe anû
recoÆÆeÅt tðe PItÅH LInkü
ýIþe tHe gRIP beÿIngs oÆ tHe otHeR
eÆD of the taIL rotoR HUĀ tHe sA¿e
tReat¿ent anā ÌoUR hUó ¶IĂ óe
f¾y
PaÅăeDĄ
63
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