PS Magazine - TB 43-PS-592

PS, The Preventative Maintenance Monthly

ISSUE 592

MARCH 2002
PS Magazine - TB 43-PS-592 - Page 5 of 32
M984 HEMTT Wrecker…
USE STABILIZER STRUTS
M939A2-Series Trucks…
I
f your M939A2-series 5-ton trucks are still using those small in-line fuel fil-
ters that clog up real fast, consider “super-sizing” it.
With help from your DS unit,
you can switch to the same filter
used on older M939s that’s larger
and doesn’t clog up nearly as often.
Your DS shop will need a kit,
NSN 4930-01-387-1147, to convert
your trucks to the larger filter.
Instructions come with the kit.
After that, you’ll just need to replace the element when it gums up. It comes
PS 592
MAR 02
8
HEMTT…
There’s
a ready-
made shield
available to
protect
the
bowl from
damage.
“It comes with NSN
“If your HEMTT has never had a shield, you’ll
need to drill three holes and buy some
hardware to install it.”
“Drill 3/8-in holes in the fender and
mount the shield with three capscrews,
“three lock washers,
“…and three nuts, nsn
that’s
right!
how’d
you know?!
“Eyeball the bowl
occasionally for
cracks. A web of small
cracks can be a sign
of
impending failure.
The shield will help
contain
pieces if the
bowl shatters.”
Replace this
filter with
bigger one
attach my
stabilizer
struts
before
driving your
wrecker.
The bowl
of a HEMTT’s
fuel-water
separator,
of course.
B
efore you move an M984
HEMTT wrecker equipped with
the HIAB crane, make sure the
boom stabilizer struts are locked
in place.
No matter how short the trip,
those struts must be in place to
prevent the boom from bouncing
around. The boom is top-heavy
and the bouncing over-stresses
the lay-down cylinders, ripping
them loose from their welds.
Then the boom falls.
If anything or anybody is in
the way when the boom falls—
worse still, if a load is attached
when it falls—well, just make
sure the struts are installed
before moving out. It’s cheap
insurance against equipment and
body damage.
here’s
one I’ll
bet you
won’t
get!
What’s
plastic, full
of fuel (and
maybe a little
water)
and needs
protection
from feet,
rocks and
brush?
592. 08-09 (C)
1/25/02
2:09 PM
Page 1
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