PS Magazine - TB 43-PS-438
PS, The Preventative Maintenance Monthly
ISSUE 438
MAY 1989
M172A1
Semitrailers .
..
1
he standard lug wrench sockeT is Too short to fit the inner wheel Lug nuts on
an M±72A± semiTraiLer. So THe nuts don't get torqued.
It takes
300-350
Lb-ft of torque on eacH lug nuT to keep the inner wheeL Fom
wobbling. You'll need a deep-welL socket, NSN
5120±00±261±2821,
To torque
The inner nuts.
AfTer THe inner Lug nuts ²re Tight, puT on the spacer, The outer wheel and oUter
wheel lug nuTs. ³oRque 'em to
450±500
Lb´ftµ
ModIfIEd Lug WREnch
But drivers, th²t deep-welL sockeT won't do you ²ny good i¶ you have ² ·aT
out on the ro²d, miLes Fom The tool box.
You need to get youR support To modify your Lug wrench, NSN
5²20³00±316±
9
21
7, so it'LL fit THe inner nuTs. AlL they've goT To do is cut o¸¶ parT of THe ¹ex
end, weld on a Piece of Tubing and Then put iT aLL back togetHer Like so:
I
45°
bev±² (a²² matiNG eDGes)
i
´µln
¶·a¸iN
&
G+[Q=
M939/M939A ± .
..
One ²ssembLy ¶º»s ²¼¼ »HesE
TrUcks½
³S³
2815·01 ·²³8·883²
CAP
³S³
25³0·01·155·0305
PUMp
³S³
25³0·0±·103·6105
BOTLE
³S³
²5³0´01·155·3386
BRACKEt
Transmission OIl FiLter NSN
I CA¹'º F»¼O TE SP½¾¿oÀ
fÁLÂeR
r_
± .²
ÃÄ "HÅ
-´µ
³S³
²9³0·01-110·²³89
±
w¶·· ¸et
yÆu
THe
FilTe¹ e·eºe»t
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He
spº¾-o¾ TR²ns¿ºssºo¾ oº¼ ¶ºL»ER ÀR »HesE 5ÁTo¾¾ers ºs ¾o» sHoW¾ º¾
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