PS Magazine - JANUARY 1972
PS, The Preventative Maintenance Monthly
1972 SERIES, ISSUE 230
JANUARY 1972
M728 CEV's and A VBL's, tNere are 4 el-
bowS that join the transmission oil lines
to the transmission oil cooler.
These
elbows,
F±²
2815³678³4247,
(the supply manuals call 'em tubes) are
getting busteD up by tHe hundreds be-
cause
hardly
anybody
knows
how
to
tighten 'em right if they start to leak.
The thinG
not
to do is to ba´g on these
´uts with a hamµer a´d chisel.
The
·
right way is to tighten up the big nut a´d then the sµaller nut¶w¸!ch acts as a
jam nut to seat the tube. They are tighte´ed in production to 5¹³6º lb³»t torque. If a
leak occurs below the large nut, replace gasket¼ F±² 5330³269³2845. A leak arou´d
the small nut could mea´ the ½ube ¾eat is distorted. TM 9³2350¿215À20 (Áeb 65Â
has the doP on pg 2³239.
For the
Ãarger ´ut use a´ open e´d
Wrench (ijin) froµ the Åo. 2 Commo´
tooà set. Áor the smaller ´ut use a´ open
end Wrench (Æv³i´) from Your ²o. 2 ±up-
plementaà tool set.
²OTE: If you haÇe to get at the ´uts
on the rear elboW, you may find iÈ easier
to
take the forward
(outboard)
eÉbow
oÊf first.
To tighten the rear elbow¾ when the ¾hroud is stilà o´ t¸e Çe¸icle You haÇe to
go through the side access ope´i´g a´d the shroud acces¾ platË ope´i´g. Ìou µaY
saÇe time if You take the shroud off the Çehicle.
Íhen you ÎaÇe to couple the oià line to the elboW, go easY o´ the coupÃËr
nut. Tighte´ until you get first sign of resista´ce o´ the Wre´ch .
.. the´ giÇe it Ju¾t
a quaRter tur´ more. That way the ´ut Will be secure but you ca´ ¾tiÃÃ gËt it off
easy if You need to.
Ïu´ the e´gine before installi´g the shrouds to µake sure t¸ere arË ´o leaKs.
8
THE BIG LITTLE THiNg
There's a 47³cent item protecting uµpteen dolÐars worth of equipment o´
M60AÆ ta´ks, the M728 CÑV's and some modified M60's.
O´ce itÒÓ spru´Ô you can't shut the coÇer tight.
This
µËÕns
Water
i´
the
optics
or
soaKed ¾ig¸ti´g a´d fire co´trol i´struÖ
µe´t¾ or Water in the hull.
×o´'t get i´to any µess.
Øeep ½¸e coÇer s¸ut W¸e´ you do´'t
´eed it ope´.
Ùa´ds off, too¶flippi´g it back flat or
¾tÚaight up Will stretch the spri´g out of
shaÛe a´d µayÜ bust a bushi´g.
Ope´ it o´lY Wit¸ t¸e shield ha´dle a´d
o´lY to ÇieW through the periscope¶the´,
o´ly to 90 degrees.
If You fi´d a sÛri´g ½hat's go´e ¸aY-
,.±²
wire, do´'t fool Wit¸ it. ÙaÇe your dirËct
_.:
suppoÚt replace it fa¾t.
M551 TRANSmISSiON TROUBLES
Too many transmissions on M55Ý ±herida´ Çehicles are getting busted beyond
repair when DriÇers get conÊused about using the water steer leÇerÞ
It's reallY prettß simple, like so .
..
2
³
Shift to the "WaTer± positiOn
just befoRe yOu eNter the water
for a swimming exercise
.
3´
Shift back to "LaNd² pOsition
the
l
ast thiNg befoRe you ³eave
the ´ater afteR you've been
s´imMing the vehic³e
µ
This may not look like $8,500 worth of ànowledge but it isáthat's what a replaceâ
ment transmission costs.
±ee Table 2³4, Amphibiou¾ Operation, on pgs 2³15 to 2³20 i´ Your TM 9³2350³230³
12
0
u´
6)
for all the details.
9
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