PS Magazine - TB 43-PS-571
PS, The Preventative Maintenance Monthly
ISSUE 571
JUNE 2000
M
echanics, a bolt is a bolt is a bolt,
right? Not when it comes to installing
the propeller shaft and universal joints
on a vehicle from the M113A3 family.
Some mechanics are using bolt, NSN
5305-01-216-7378, which is supposed
to be used for attaching the output
flange to the transmission. This bolt
rewmen, your vehicle’s track and sprocket gauge is a great guide for check-
ing bushing wear, but it’s not the final authority. You are.
Sometimes the gauge, NSN
5220-01-041-9920, indicates
that bushing wear is OK, even
though the pin nuts are rubbing
against the bushing bores. That
happens when the pin bushing
in one shoe wears more than
the pin bushing in the other
shoe.
So always—
every time
—after you’ve used the track and sprocket gauge, look
to make sure the pin nuts are centered in the bushing bore. Shoes with an off-
center pin nut need careful watching.
M113-Series FOV . . .
The track and sprocket gauge is still a good, quick way to measure sprocket
wear and track tension. But when it comes to bushing wear, it’s just a guide—
like it says in your -10 TM. Always let your eyes and common sense be the
final judge.
Keep close watch on off-center pin nuts.
..
...but replace shoe if pin nut touches bore
If the pin nut is touching the inside surface of the bushing bore, the shoe’s no
good. Replace it no matter what the gauge tells you.
Beware of
Wrong Bolts
is about 1 inch too long for securing
the prop shafts and U-joints, so it
damages the output housing on the
transmission.
The right bolt is NSN 5305-00-719-
5239. It’s just the right length for se-
curing the prop shaft and U-joints
without damaging the output housing.
PS 571
19
JUN 00
18
JUN 00
wait!
my
track's
killing
me
! isn't there
something
you
can do?
sorry,
the
gauge
says
your track is
good
.
but the
gauge
can't
indicate
bushing
wear.
Don’t rely on gauge to check bushing wear
Prop shafts and U-joints
need correct length bolts
M113A3 FOV . . .
i'm too
long
.
i'm
the
bolt you
need.
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