PS Magazine - TB 43-PS-571
PS, The Preventative Maintenance Monthly
ISSUE 571
JUNE 2000
here is an art to adding lubricant to the inside of HMMWV tires before
installing the runflat device. Do it wrong and you’ll wear out a runflat and a tire
before their time.
Here’s the secret of the art:
1.
If the tire’s been used before, remove any foreign matter or old lubricant with
warm soapy water and a brush. Let the tire dry.
2.
Use all of one 11-oz tube of lubricant, NSN 2640-01-419-6200, for each
runflat device. Spread the lubricant evenly
over the inside of the tire to a depth of
1
/
8
to
3
/
16
inch. Use a 2-in to 4-in paint brush
to apply the lubricant.
Areas inside the tire that get covered
include the crown and the upper portion of
the inner sidewall.
To get a 55-gal drum of the lubricant,
order NSN 2640-01-457-5552.
HMMWV Slave Cable Screw
U
se NSN 5305-00-269-2801 to get
the
3
/
8
-24 x
3
/
4
-in
hex screw that
attaches the power cable to the slave
receptacle on HMMWVs. The one
shown for Item 1, Fig 64, in TM 9-
2320-280-24P-1 brings a
3
/
8
-16 x
3
/
4
-in
hex screw.
HMMWV . . .
f the cab or spare tire carrier on your
FMTV won’t go up or down using its
hydraulic control, your first trouble-
shooting check should be the fluid in
the air/hydraulic power unit.
So, you check it and the fluid level’s
fine. You can see there’s no water in
the unit. There’s no Dexron or other
wrong fluid in it, either. What’s next?
Next is a check of the fluid
restrictors—the TM calls them orifice
plugs—located at the back of the CAB
TILT and SPARE TIRE valve cavities.
Clogged restrictors will keep the valves
from working.
Since the removal and cleaning pro-
cedures aren’t found in the TMs, here’s
what you need to do:
1.
Remove the affected valve. Refer
to Para 19-4 in either TM 9-2320-365-
20-3 (for 2
1
/
2
-ton models) or TM 9-
2320-366-20-3 (for 5-ton models).
Family of Medium Tactical Vehicles . . .
3.
Clean the restrictor with a small
piece of wire (a single strand of 18-
gauge electrical wire works well).
4.
Rinse the restrictor in
dry cleaning solvent and
blow it dry with shop air.
5.
Reinstall the restrictor
and valve. Recheck the
fluid level in the air/hy-
draulic power unit since
you will lose some in the
process.
You should have power
restored to the cab and
spare tire valves. If not,
your next move is to dis-
assemble and inspect the
manifold itself.
Remove restrictors with hex head wrench
PS 571
7
PS 571
6
JUN 00
spreading
lubricant
the
right way
makes a
runflat run
a long
time!
make
a
note
'til
the tm is
updated
.
Apply lubricant here
2.
Remove the restrictor with a 4mm
hex head wrench that’s at least 4
1
/
4
inches long, like NSN 5120-01-045-
4889 in the No. 1 or No. 2 Common
shop sets.
your
fluid level is
fine
, so
now
what
?
you'd
better check
my
fluid
restrictors
.
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