PS Magazine - TB 43-PS-634

PS, The Preventative Maintenance Monthly

ISSUE 634

SEPTEMBER 2005
PS Magazine - TB 43-PS-634 - Page 7 of 33
PS 634
SEP 05
11
D
rivers, throwing rub-
ber is what happens
when you operate your
HEMTT beyond its rec-
ommended speed limits.
Most
limits
are
spelled out in the chart
on Page 3-61 and 3-62
of TM 9-2320-279-10-1.
Other culprits of tire
damage include wrong
air pressure and too
much load—so keep
these in check.
M939A2 Arctic Fan Belt
NSN 3030-01-287-3155 gets an arctic fan belt for cold weather. It stands up to “Old Man
Winter.” Take off the arctic belt in the spring and use the regular belt, NSN 3030-01-271-3754.
Keep spare belts laid flat in a cool, dry place. Never hang ‘em on a nail—they can kink!
PS 634
SEP 05
10
HMMWV…
Geared
Hub
Flub
That’s because the vent line from the geared hub is connected
to the vent line from the fuel pump. But for fuel to get into
the geared hubs, the fuel lift pump diaphragm must be
leaking. If the pump is leaking, your truck could also be
hard to start or run rough.
Pump problems can
cause fuel to be pushed
into the vent lines, and
since the geared hubs are
the lowest points in the vent
system, the fuel tends to go there.
Fuel and gear oil don’t lube well. That combo
damages hub gears. Plus, too much liquid in the
geared hubs leads to blown seals.
Remember, finding fuel in the geared hubs is
not common. But when you do, replace the fuel lift
pump with NSN 2910-01-168-7905. Then replace
the hub gear oil. You need to blow out the vent sys-
tem with compressed air to get rid of the fuel.
30 mph
20 mph
15 mph
Loads to
50,000 lbs
Loads over
50,000 lbs
Level road
Hilly road
Off road
35 mph
30 mph
15 mph
Towing speeds
for the M984E1
are also shown
on Page 1-13 of
the -10-2.
Those
towing
speeds
are…
Mechanics, what you
expect
isn’t
always
what you get.
what can you find
in the hmmwv’s
geared hubs?
gear
oil.
of
course.
maybe,
if the
seal is
bad.
fuel!?!
water.
um…
fuel?
it’s possible.
read on…
fuel and gear oil
together
don’t
lube well. could
be the vent line!
hmm… your driving
has turned this
foot into lead.
it must be
hard on your
shoes.
oh, man, doc. you
oughta see what it
does to my
hemtt’s
tires.
HEMTT…
They’re on a
yellow sticker
on the wrecker’s
driver-side
door, too.
634.10-11(C).qxd
7/29/05
11:27 AM
Page 1
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