PS Magazine - TB 43-PS-602
PS, The Preventative Maintenance Monthly
ISSUE 602
JANUARY 2003
PS 602
JAN 03
9
M2/M3-Series Bradleys, MLRS…
KEEP NUTS IN THEIR PLACE
C
rewmen, nothing messes up your day like
a broken track on your Bradley or MLRS.
So it pays to do your part in making sure that
doesn’t happen—like keeping a close eye on
the track pin nuts.
Eyeball the nuts after each operation. If
there are two or more threads showing past
the front edge of the nut, it’s good to go. One
thread or less means the nut’s loose and your
track is at risk.
Check for off-center track pin nuts. Worn
bushings result in off-center nuts, which
make it next to impossible to keep track ten-
sion set right.
Mark loose or off-center nuts and report
‘em to your mechanic. He’ll replace loose
nuts, NSN 5310-01-140-4555, and torque
them to 299-325 lb-ft. Don’t let him
retorque
them, though. The nuts won’t hold
a
second time.
PS 602
JAN 03
8
N
ormal use and regular exercise of a tank’s main gun will ensure the gun mount
seals stay flexible and lubricated, mechanics. Even so, a leak could eventually
develop.
When that happens, you may think you have to install a new seal kit, NSN 1090-
01-259-9112. Not only does the kit cost more than $1,000, but you have to com-
pletely disassemble the gun mount to install it.
Before you do that, take a close look at the leak’s location. If the leak is coming
from the front seal only, you can replace just the front seal, NSN 1015-01-284-8303,
and wiper, NSN 5330-01-176-8751.
Those two parts cost about $65 and can be replaced without disassembling the
gun mount.
‘Course, if the rear seal is leaking, you’ll still need to order the kit and replace
both the front and rear seals.
M1 Idler Arm Seal
M
echanics, don’t replace the idler arm seal on M1/IPM1 tanks with NSN 5330-
00-978-7353. Too many of those seals have developed leaks. Order a stronger seal
with NSN 5330-01-478-2379. Pencil in the change to Item 24 in Fig 240 of TM
9-2350-255-24P-1.
got another
leaky gun
mount seal
to replace!
great!
there goes
another
$1,000!
wait!
you may
only need to
replace the front
seal and wiper!
I’m g-going
to sh-shake
apart if they
d-don’t check
muh-my track
pin nuts!
Two or more threads
showing? Nut is tight
Report off-center
nuts like this one
M1A1/A2 Tanks…
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