PS Magazine - TB 43-PS-556
PS, The Preventative Maintenance Monthly
ISSUE 556
MARCH 1999
Bouncing
grille
doors
damage
exhaust
seals
ankers, if you suddenly hear a high-pitched squealing noise coming from the
hydraulic manifold on your M1-series tank, don’t panic. It could be something
as simple as a missing clamp.
When mechanics replace the hydraulic manifold filters, they sometimes forget
to reattach the line from the check valve to the stud on the reservoir guard.
During operation, the unattached line
vibrates fast enough to create the noise.
Look for clamp, NSN 5340-00-079-
7837, where the hydraulic line attaches
to the reservoir guard. If it’s missing,
get your mechanic to put a new clamp
on the hydraulic line and attach it to
the reservoir guard stud with screw,
NSN 5305-01-383-6087.
ankers, your -10 TMs say to check
the engine exhaust seal monthly for
cuts, tears or burns. But, it’s what you
do
after
that check that often decides
what the seal’s condition will be like
next month.
After closing the exhaust grille doors,
you need to secure them in place with
two bolts and J-hooks. That’s where
the problem starts.
The bolts are supposed to be torqued
to 295–350 lb-ft. Since crewmen don’t
have a torque wrench, a mechanic
should do the job.
M1-Series Tanks . . .
Mechanics, before you torque the
bolts, make sure you coat ’em with
antiseize compound, NSN 8030-00-
597-5367. That makes the bolts easier
to remove next time.
Also, you may notice a little goug-
ing on the surface of the J-hooks as
you torque down the bolts. The J-hooks
are made from a lower-grade steel, so
gouging is common.
Don’t let it stop you from tightening
the bolts to the proper torque, though.
Replacing a J-hook is a lot cheaper
than buying a new grille door or ex-
haust seal.
seal. Then you have to call in a me-
chanic anyway—to replace the seal.
Unfortunately, some crewmen try to
tighten the bolts themselves. When the
bolts come loose, the grille doors
bounce up and down and tear up the
Mechanics
torque
J-hook bolts
holy
cow!
was it
something
you
ate
?
no
,
just a
loose hydraulic
line
!
hey,
that's
my
job
!
Clamp line to stud
13
MAR 99
PS 556
12
MAR 99
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