PS Magazine - TB 43-PS-620
PS, The Preventative Maintenance Monthly
ISSUE 620
JULY 2004
Some PM
MLRS Carrier …
Generate
Pulleys
The V-belt passes over the pulleys at high speed. That
builds up a lot of friction between the belt and the pul-
ley grooves. So take a close look at the sides of the
grooves on each pulley. If the grooves are cupped, the
pulley is no good. Replace it.
Next, eyeball the pulleys where they come in contact
with the V-belt. If the belt bottoms out on a pulley, the
grooves are too worn and the pulley should be replaced.
Check to make sure the pulleys are straight. A belt
running on crooked pulleys will wear out much faster
than on aligned pulleys.
Hold one end of a string
across the face of the pulley
on the harmonic balancer and
the other end across the face
of the pulley on the bearing
unit. Pull the string tight. If
there are no bends in the
string and no gaps between
the string and the pulley faces,
the pulleys are in alignment.
if either are
worn or out
of alignment,
all that’ll be
generated are
problems.
V-belt
When changing a V-belt, don’t stretch or roll it onto the pulley. There’s a good
chance the V-belt will suffer damage and early failure.
Always release tension first, then slip the V-belt in place.
Once the V-belt is in
place, don’t rely on a “cali-
brated thumb” to adjust the
tension. Always use a scale
to measure deflection.
Then, after the vehicle has
been operating a few hours,
check and adjust the ten-
sion again if needed.
PS 620
JUL 04
7
Look for cupped
pulley grooves
Stretch string across pulley faces to check aligment
Use adjuster
to release
belt tension
Crooked pulleys
will damage belt
OK. Let’s
get the
launcher
deployed.
The
launcher
stopped
moving!
Must
be the
batteries!
The batteries
died because
of no PM for
my second
generator!
its
belt and
pulleys
are
shot!
Hey!
The MLRS’ second
generator is only
as good as its
V-belt and pulleys,
mechanics.
620. 06-07 (C)
6/7/04
1:39 PM
Page 1
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