PS Magazine - TB 43-PS-559

PS, The Preventative Maintenance Monthly

ISSUE 559

JUNE 1999
PS Magazine - TB 43-PS-559 - Page 7 of 34
Is Yours Modified?
MWO 9-4910-593-20-1 (Mar 95) modified tow bars by adding sleeves to the
welded areas. If you have a tow bar that is unmodified (no sleeves), contact your
local MWO coordinator to get the modification done.
ACALA still has some kits available for this EMERGENCY MWO.
Need Decals?
An ID decal for the tow bar
An
operator’s instruction decal is
Motor Vehicle Tow Bar . . .
ID decal
Instructions decal
round, but oblong). Check the diam-
eter of any odd-looking holes with
calipers.
On male legs, the largest accept-
able hole diameter is
25
/
32
inch. On
fixed and moveable legs, the max is
51
/
64
inch. Replace any leg that has
larger holes.
Legs that pass inspection still need
attention. Deburr the pin holes that
need it using emery cloth or sandpa-
per. Clean the holes with a dry cloth
and apply corrosion preventive com-
pound (either NSN 8030-00-837-6557
Then measure from the center of
the last pin hole to the end of both
fixed legs. If you get four inches (plus
or minus
1
/
16
inch), you can use the
tow bar as is.
If your measurement is more than 4
1
/
16
inches, cut off just enough of the leg
end to get four inches.
Deburr and clean the cut, then prime and paint all exposed metal. Use any
olive drab green and don’t worry about exact color matchup.
otor
vehicle tow bars, NSN
4910-01-365-9304, show wear through
cracks and wallowing at the adjustment
pin holes. These cracks and wallowed
holes can cause accidents. Here’s what
to look for on your tow bars:
Look at all welded joints. If you find
cracks, turn in the tow bar! It is unsafe
to use.
Look at all adjustment pin holes on
the tow bar legs. If you spot any cracks,
replace the leg.
If there are no cracks, look for pin
holes that are wallowed out (no longer
uh-oh!
how are we
going to explain
this
?
Moveable leg, NSN
4
1
/
16
-in limit
4
1
/
16
-in limit
Male legs, NSN
OPERATOR S INSTRUCTIONS
LOADING WHEELS DOWN TOWING (HIGHWAY)
TOWBAR FULLY RETRACTED. ATTACHED TO SHACKLE
BRACKET ONLY (39,000 LBS GVW MAX)
DO NOT ATTACH TO BUMPER
LIFT TOW WHEELS UP CROSS COUNTRY
TOWBAR ATTACHED TO AXLE (39,000 LBS GVW MAX)
DO NOT ATTACH BUMPER
WARNING USE APPROPRIATE SAFETY CHAIN
TOWBAR MOTOR VEHICLE WHEELED
NSN
MFR
DESIGN ACTIVITY CODE NO.
19204
CONTRACT NO.
SERIAL NO.
US
âž¾
âž¾
âž¾
Fixed leg, NSN
Look for cracks and measure wallowed holes
10
PS 559
11
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