PS Magazine - TB 43-PS-687
PS, The Preventative Maintenance Monthly
ISSUE 687
FEBRUARY 2010
14
PS 687
FEB 10
It’s not so easy to check the cap
screw in the hub. You must frst remove
an access plug to get to the screw, then
use a torque wrench to tell iF the screw
is loose.
IF the screw moves beFore you reach 37 lb-Ft
oF torque, it’s loose. Replace it with a new lock
washer, NSN 5310-00-011-5093, and cap screw,
NSN 5305-00-068-0511. Dip the new screw in the
sealing compound and torque it to 37 lb-Ft.
Check both ends oF the halFshaFt For tightness
at every 6-month service.
By the way, when the halFshaFt is on the vehicle,
there shouldn’t be any play in it. A halFshaFt that’s
been tightened up shouldn’t have this problem.
IF a halFshaFt flies loose, it can take out the brake lines and coolant tube, and cause
engine Failure. So don’t halF step when checking halFshaFt bolts For tightness.
Once you’ve cleaned away dirt
and mud, it’s easy to see iF the
bolts that hold the halFshaFt to
the rotor are loose. Just look For
shiny spots under the bolt heads.
IF you fnd a loose bolt, replace
both the lock washer, NSN 5310-
01-457-3292, and the bolt, NSN
5306-01-185-7048. Dip the bolt
in sealing compound, NSN 8030-
01-171-7628, beFore installing it
to help keep it tight. Then torque
the bolt to 51 lb-Ft.
ONLY Mechanics
Should Adjust Brakes!
HMMWV…
Don’t Half Step on Halfshaft CheCk
M101/M116-Series Trailers…
ONLY Mechanics
Should Adjust Brakes!
you’re not adjusting
me, unless you follow
tm 9-2320-202-14&p!
all it takes to loosen
screws and bolts on your
hmmwv’s halfshaft is a
little
vibration
over a
period of time.
you
don’t
want a
halfshaft
flying
loose!
that’s why you should check
all hardware holding the
halfshafts in place, especially
the retaining capscrew inside
each geared hub.
make sure you
follow the guidance
found in para 6-9 of
tm 9-2320-280-20-2
and para 6-
7
of
tm 9-2320-38
7
-24-1.
mechanics,
inspect hmmwv
halfshafts
when they’re
removed from
the vehicle.
Clean away dirt, then look For
shiny spots under bolt heads
Don’t Forget hub’s capscrew
my half-
shaft bolts
feel
tight!
…still
good!
I’m glad
someone’s
keeping my
bolts tight!
687.14-15.indd
1-2
12/21/09
4:28:28 PM
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