PS Magazine - TB 43-PS-581

PS, The Preventative Maintenance Monthly

ISSUE 581

APRIL 2001
PS Magazine - TB 43-PS-581 - Page 3 of 32
PS 581
APR 01
3
The fuel/water separator filter and
the secondary fuel filter usually
aren’t any trouble. They always seem
to get replaced when necessary.
Not so with the electric priming
pump,
that’s used for pressurizing the fuel
system. Because the pump sits out of
sight behind the fuel/ water separator,
it’s often overlooked when it comes
to maintenance.
PS 581
APR 01
2
ake all the regular precautions to safely inflate and deflate tires and to work on
multi-piece HEMTT wheels. Then, note that your TMs have some misleading
information concerning the lock rings.
TM 9-2320-279-10’s after-operation PMCS, various warnings in TM 9-2320-
279-20-1 and -20-2. and maintenance procedures in the -20-2 all say that lock ring
ends must not gap more than 3/8 inch. But the width of the gap is not as important
as making sure there
IS
a gap.
If the lock ring ends touch on any HEMTT wheel, including the spare, your truck
is NMC until the wheel is repaired.
For the whole story, get copies of TACOM Ground Precautionary Messages
(GPM) 99-08 , 00-002 and 00-003 from your local safety office or logistics assis-
tance office. TM changes are scheduled to be made in the next revision or update.
Look for lock
ring gap
echanics, dirty fuel is no laughing matter. Just ask any PLS driver who’s been
stuck in the boonies with a truck that won’t run.
If the filter clogs, fuel flow is interrupted and the engine runs rough or not at all.
Even worse, a clogged filter can make the pump seize and burn up.
So change the filter, NSN 4310-01-286-4680, annually or every 6,000 miles,
whichever comes first. You’ll find the replacement procedures on Page 4-6 of TM
9-2320-364-20-4.
Priming pump is hidden behind
fuel/water separator
HEMTT…
M1074/M1075 PLS…
581. 02-03 (C)
2/24/01
3:47 PM
Page 1
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