PS Magazine - SEPTEMBER 1981
PS, The Preventative Maintenance Monthly
ISSUE 346
SEPTEMBER 1981
There are 2 brake master cylinders in the system that look enough alike to be
twins. They act real different, though, so if you put in thE Wrong one you're in
deep trouble±
M39 or M809 series
5-ton ²rucks:
NSN 2530-00³741³1070
(PN 7411070)
One hole
M48 and M60´series
tanks:
(PN 1091µ089)
¶
Three·
hoLes
To make sure supply gave you the
right part, open the plug and look in at the
return poRt holes in the bottom of the
·
reservoir± If you see 3 return port holes,
you've gOt the brake cylinDer for tanks±
If it has only one hole, it's For trucks±
·nce you knoW What you've got, you can mark it TANK or ¸¹ TºK WitH the
m»tal stamping Die set, N¼N 5110³00½289³0007, in youR No± 2 Common tool
¾
set± Careful, not too hard or you'll Break the cylinders± ¼o¿e people would
sooner put the identiÀication on in paint, although that is not as permanent±
Just make sure you get the right cylinder in th Right vehicle±
This is necessary because if you use the truck master cylinder in a tank, it
won't give you enough pRessuRe± ·n 'tuther hanÁ, i you have a tank master
cylinder in a truck, the brakes will lock When you press DoWn on thà brake pedaÄ
14
-,.±
'²
"±
J
-
o:
-±'
² ³
´
J
.±
4
SeE if tHe roadwHEel wear platE'± outer cUrlEd Edge i± worn ²f³.
If tHe edge ´± worn off, rEplace botH plate sEcµ´ons¶
lf
l:
Wear plates
¸ockwa±hER
¹oaDwheeL
4
See ´f µhe Roadwheel wear PFAµe capsCrews are ºamaged or Mi±±´ng and
re»lace as ne¼essary½
±
If fewer µhan 2¾¿ µhreaºs rema´n at µhÀ wear »laµe µhReaºed HoleÁ
repLace Boµh weAr »lAÂe secµÃonÄÅ
²
TorqUe all ¼a»s¼Rews µo 20Æ5 lb-fÇ anD coaÈ É´µh seALÃng compoUndÊ
NSN 8030Ë00Ì081Í2340Î
That'lL geµ yoU a 50ͼ¼ BoµµleÅ
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