PS Magazine - TB 43-PS-592

PS, The Preventative Maintenance Monthly

ISSUE 592

MARCH 2002
PS Magazine - TB 43-PS-592 - Page 4 of 32
PS 592
MAR 02
7
STOP BREAKING THE EARS OFF
S
pace between
your
ears is no reason
for broken ears on 60-amp, 100-amp
and 200-amp HMMWV alternators.
But if you forget to re-install the
spacer at the rear alternator brace,
that’s what you get—a broken ear.
Tightening the brace nut without the
spacer in place puts too much strain on
the ear. Then the ear breaks off and the
alternator has to go to the rebuild shop.
PS 592
MAR 02
6
HMMWV…
Halfshaft Bolts Vibrate Loose
I
t’s well known that vibration loosens the halfshaft bolts on HMMWVs. And you
get plenty of vibration when your HMMWV goes cross-country.
As you rock and roll over hill and dale, the bolts can back out and move closer to
the brake caliper adapter. Eventually, they catch the adapter and break off.
Then the brake rotor wobbles, wear-
ing out brake pads. That can leave you
brakeless.
So eyeball the halfshaft bolts any time
you pull a service on the HMMWV—
and for sure while you’re in the field.
Look for shiny areas under and around
the bolt heads. If you see a loose bolt,
report it. Have your mechanic replace
the bolt, NSN 5306-01-185-7048, and its
lock washer, NSN 5310-01-185-7218.
Never reuse the lock washer. It won’t hold the second time around. It’s a one-use
item. Also, make sure all bolts and washers are replaced when the disc rotor or half-
shaft assembly is replaced.
Look for loose
halfshaft bolts
I think I’ve
got space
between my
ears, too,
sarge!
We’re
not
talking about
those
ears,
private pyle!
“If you have to,
tie
the spacer
to a finger so
you
remember
to use it again.”
“Eyeball
Pages 4-10
and 4-11 of TM
9-2320-280-20-2
for details.”
Spacer, NSN
used with brace, NSN
60-amp and 100-amp
alternators.
Spacer,
NSN 5310-01-
337-7034, is used
with brace, NSN
on 200-amp
alternators.
Spacer
here
Make sure you
eyeball those
halfshaft bolts
after you clean
this truck…
…we ran it
pretty hard
and they'll
loosen up in
tough use!
592. 06-07 (C)
2/2/02
1:24 PM
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