PS Magazine - TB 43-PS-591

PS, The Preventative Maintenance Monthly

ISSUE 591

FEBRUARY 2002
PS Magazine - TB 43-PS-591 - Page 6 of 33
HMMWV…
PS 591
FEB 02
8
P
rotecting the M1074 and M1075 PLS tractor's air system from moisture is your
job, mechanics. An aftercooler and two air dryers will keep the air dry, if you keep
them serviced.
Aftercooler
The PLS aftercooler cools com-
pressed air so there's less moisture
going to the air dryers. To do this, the
foil filter in the tractor's aftercooler
must be replaced every 2,000 hours or
annually, whichever comes first.
The old recommendation—to clean
and inspect the foil filter for reuse—
no longer applies.
The easiest access to the aftercooler
filter is through the bottom lid. That
way, you won't have to disconnect the
steering driveshaft.
Do not
avoid servicing the aftercooler because it looks like a hard job. If the fil-
ter is not replaced on schedule, moisture gets into the system, corroding or blocking
air operation, leading to mechanical component failures. The aftercooler filter kit is
Hex head bolt-NSN 5305-00-782-9489
Flat washer-NSN 5310-00-080-6004
Plain nut–NSN 5310-00-010-5606
Air Dryers
The air dryers remove dirt and moisture from the air going to the reservoir. To do
this, the desiccant bags in the air dryers must also be replaced every 2,000 hours or
annually, whichever comes first.
Failure to replace the desiccant bags will also cause corrosion, leading to com-
ponent failure. The air dryer filter kit is NSN 4440-01-337-7324.
Remove
canister…
…and open to
replace desiccant
bags in air dryers
or foil filter in
aftercooler
I
f you break the bolt that
tightens the air cleaner
housing clamp on your
HMMWV,
but there’s
nothing else wrong with
the clamp loop assembly,
there’s a way to save
some money.
Don’t
replace
the
entire assembly. Instead,
replace only the bolt
with these cheap items:
“The only drawback
with this fix is that
you’ll have to use
a 3
/
8-in socket
wrench to loosen
or tighten the nut.”
The
adjustable
wrench in
the BII
won’t
do
the job.
Service air dryers from above,
aftercooler from below
Aftercooler
Air Dryer
Air Dryer
M1074/M1075 PLS Tractor…
Hey!
wait a
minute!
I wasn’t
finished with
the
after-
cooler
or
the
air
dryer!
591. 08-09 (X)
1/8/02
2:23 PM
Page 1
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