PS Magazine - TB 43-PS-442

PS, The Preventative Maintenance Monthly

ISSUE 442

SEPTEMBER 1989
PS Magazine - TB 43-PS-442 - Page 6 of 33
ontact arm bRushes and slip Ring
segments must be clean and gapped
Right, oR you'
11
get no electRicity to youR
howitzeR cab.
That's clean-as in no g±ease oR oIl²
GRease and oil keep bRushes fom mak³
ing good contact with the sLip Ring seg³
ments. No juIce means no poweR to cab
components and instRUments.
CRews, that means be ±eaL caReFUl
Lubing the cab Race Ring. ´ollow the
woRd in µO 9¶2350·311·12² µightly
lube
the
±ace
sur¸aces,
spRIngs/
sepaRatoRs and balls with GAA.
8
Mechanics,
don't
oveRlube
the
t¹ave±sing mechanIsm Ring geaR and
output dRIve geaR² º¸ GAA dRips onto
the slip Ring segments a»d b±ush hol¼
deRs, you'Ll get an electRicaL ¸aI½u±e.
To get the Right contact aRm gap, use
a ¸eeLeR gage ¾R the 0²105¿in cleaRance
neededÀ
See Pages 10Á16 thRough 10Â18 oÃ
TM 9¿2350·311Ä20¿2 ¸ÅR the in¾²
Gap 'em Right, keep 'em clean and
you'll have powe± when you need It.
SEP 89
.
,_.±:² -
the sÆRockets have BUÇlt·Çn weaR ÈaRksÉ
ºt's a LÇttle moRe di¸¸icu½t iÊ yoU have
to Use weaR gage, ËÌN 4910·00Í90η
7344É
With the bui½t·In weaR maRks, once
weaR Reaches the maRks you ReveRse the
spRocket so the otheR side o¸ the teeÏh
can Be usedÀ WHen both sidEs a¹e Ðo¹n
to the ma¹ks, yoU RepLace the spRocketÑ
The weaR gÒge, howeveR, has ¾uR
ÈeasuRements caLLed out on Çts sU¹ÓaceÀ
Ôhich one (oR ones) do yoU use? Õse
SEP 89
9
on½y thE ½ast oneÖ×ØÙ incHÉ When Ðea¹
Reaches ×ØÚ Inch, Reve¹se Ïhe spRocketÛ
AgaIn, Ðhen Üoth sides aRE Ðo¹n, ReÝ
pLace the sp¹ocketÉ
No wear mark?
Use sprocket
weaR gage, N±N
4²³0-0´µ²0¶· 734¸
C¹ew ½eveL checks aRe Èade ÈonthÞy
and unIt maIntenance checks a¹e ÈadE
annua½½yß àÊ these checks a¹e oveRá
looked, sp¹ockets can weaR Ïoo ¸âR inÏo
one side o¸ the teetHã
ThaÏ caUses the spRockets to "Hookä
tRack end connecto¹s wHen you'RE
ÈovingÉ The connecto¹s åRE daÈaged,
tRack LIæ Is ±educed and spRockets aRe
bRokenÉ
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