PS Magazine - MAY 1977
PS, The Preventative Maintenance Monthly
ISSUE 294
MAY 1977
DURING IDLE-Whenever you run
your engine at
.
idle for a long time,
±uM the compressors
²
on for about
10
min³tes´ That wiµl spµash lube aro³nd
inside the compressors and keep the
parts from rusting´
SHEAR PINS-Support can now get
and install new pins for you´
(Note: If
thE shear pin falLs agAin shortLy after
you have puT a new one ±n, this shows
something ±s wrong with the com-
prEssor.
REmove
the
comprEssor
²
bEforE morE damagE is donE.)
QU¶RTERLY-You change oil in
both compre·sors during reguµar
quarterµy maintenance or ¸henever
150
rounds have been fired fro¹ the
main gunº or the Vehicµe has gone
750
miles´
Take out t»e dipstick and then twist
off the oiµ drain t¼be cap´ (It sho¼µd be
secured ³nder the compressor with a
chain´)
a pint and
a_
quarter for each compressor´ ½ak
sure you use onµ¾ the speciaµº synthetic;
MIL-L±23699B
oil´
If you get in too much oiµº drain it off'
until
you get
the
µeveµ
right´¿À
Otherwiseº the compressors
work the ¸ay they shouµd´
CO½PRÁSSOR ¶IÂ ÃOCKÄWhen
yo³ pour lube into the compressor fiµl
holeº an air pocket in the tube can
give you a faÅse high readingº and a
tabµÆspooÇ or
2
of oil wiµl change the
oil leveµ dipstick readiÈg from ¶DD to
FULL´ ¶fter adding ¸hat the dipstick
shows is enough oiµº run the comÉ
pressors for a ¹in³te and t»en take
another Êeading´ Ë_f itÌs µo¸ againº add a
µittµe ¹ore oiµ and
Í
take another
reading´ Keep on doiÇg this until yo¼r
dipstick gives you a stable readiÇg that
doesnÎt change afteÊ you run the
compressors´
COÏPÂÁSSOÂ
CLE¶ÐINÑÒ
Co¹pressors run hotter (and µess
efficientµy) if t»e
Ó
fins and cooµing
tubes get caked ¸it» dirt´ Ôake the dirt
off ¸ith soapy ¸ater and a Brus»Õ
D¶ILYÒIf the oiµ µeveµ is beµow the
sighting diÖkº µoosen the gearbox sight
pµug housing by ±urning it w×th a hexØ
head wrÙnch or screwdriver´ ¶fter
adding enough OÚ/HÛO
10
ÜOE¶ at
Ýempera±¼Êes under 0°F) to cover the
leveµ sighting diskº scre¸ the sig»t
plug housing Back on´ Þse a new
0-
ring every time you add oiµ´ Ôheßà
·.
±
= ²³
´
; ±
. _i ADG²O³l?
USE NEW ´µR³NG
rings areáisted as ÐSN
5330±00±70¶·
5643
(½S
28775±¸¶8) 96906¹
QU¶RÔEÂLY-Drain quarterµy if
yo³ have the power pack out for
servicing´
(NoTE: SincE ³T's not practicaL
To drain ThE gearbox unL´ss thE poWEr
Pack is outµ you miGhT onLy do th³s
EvEry oThEr
Q
sErvicE. On 'TuThEr ha¶Dµ
you shouLd aLso do ±t whEn thE PowEr
pack ³s rEmovEd for cLEaninG bEtwEE¶
rEGuLar
Q
se·icEs.)
To drain the
gearboxâ open the 3ãin pä³g on the
hexãhead wrench t»at ca¹e wit» your
Ðo´
2
Co¹¹on tooä set´ If itås æBeen
µostº ÐSÐ
5¸20±00-¶40·5¶68
wiµµ çet
yo¼ a new one´
So¹e o¼tfits cut ofè aÇ end oè t»e
»exãhead wrench and eit»er stick it in
a socéet oê weµd it in t»eÊe´ ë»is is a
SOCKET
HEX WRENCh
I
mAKE THºS TOOl
i
µot easier than tryinç to turn t»e pµ¼g
By ha¹merinç on t»e wrenc»´
You aµso open the ìíin îµug on tïe
Botto¹ of t»e geaÊ BoX wit» a
5
/16ãin
»exíhead wrenc»º ÐSÐ
5¸2»·00±¶40·
5274
in ¾o³Ê Ðo´
2
Co¹¹on´
¶fterð<:>ñòói!ôõö÷øùµú
ouûüof
ýthe gear Boxº you can then use the
20
ìãin hinge handle 3íin drive fro¹ t»e
Ðo´
1
Com¹on tooµ set wit»o³t a
socket to taée the cap off the fiµter
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