PS Magazine - TB 43-PS-601
PS, The Preventative Maintenance Monthly
ISSUE 601
DECEMBER 2002
PS 601
DEC 02
15
HEMTTs…
Dear SFC M.S.F.,
Your question reminds me
of the time a buddy replaced
wheel bearings on the rear end
of his old ’67 Chrysler. Within a
week those bearings were toast!
He found out the hard way that
an initial lube with grease was
needed to install those bearings.
Well, the same goes for the
rear tandem wheel bearings on
your HEMTT. Grease is used as
an initial lubricant until the gear
oil from the axle and differential
gets to those bearings. By the
way, you’ll find this info in Para
12-2 of TM 9-2320-279-
20-2. And you don’t have to
re-grease the bearings on a
scheduled basis.
PS 601
DEC 02
14
HMMWVs…
ec
coded part numbers
mechanics,
listen up!
Did you get a HMMWV part with an “EC”
in front of the base part number?
If so,
don’t worry.
The HMMWV’s
headshed is working on ways to reduce
corrosion on some of the vehicle’s parts.
So “EC” just means the part has
enhanced protection against corrosion.
Some examples of “EC” parts include:
EC12338221
-exhaust hanger bracket
EC12339386
-door striker catch
EC12339655-9
-cargo shell
An “EC” also means the
part will last longer
than the part shown in
the technical manual.
Hey, Half-
mast, what’s
up with this
“EC” stuff?
hmmm…
“EC”in
front of the
part number
means…
…enhanced
protection
against
corrosion!
Dear Half-Mast,
Do we use gear oil or grease when we install the rear tandem wheel
bearings on a HEMTT? The technical manual says gear oil, but some of
our unit’s senior mechanics want to use grease.
SFC M.S.F.
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