PS Magazine - JULY 1984
PS, The Preventative Maintenance Monthly
ISSUE 380
JULY 1984
M198
Towed
Howitzers .±²
M
198
towed howitzers colLect more
NMC time fr brake problems than
a±ything eLse. And, a²most a³L Brake
prob²ems are preventab²e.
Here's how:
•
Hook up the air Lines right´ IF the
Lines are reversed, the brake system
wiLL Lock up. Make sure the service
µrake ²ine ¶s coupLed to the service
hookup, and the emergency brake ·ine
is coupLed to the emergency hookup.
I¸ your ·¶nes aren¹t ºarked, pa¶nt the
service L¶ne coupLing ye²Low and the
emergency L¶ne coupLing red»
•
Check the air pressure indicator.
AFTer the ²ines are hookeD up to The
prime mover, the ¼ir Va³ves are open-
ed and the reservoir ½s F½l³ed, reach
through the round ho³e in the side oF
The right trai² and check
¾
the indicator.
¿o this every time be¸Ore you tow.
IF the indicator sticks out more than
³/2
inch, check both the how½tzer's and
the prime mover's brake system fr
²eaks. Àhere must be enough air
pressure gett¶ng to the brakes to re²ease
the carrier/Á¶ner o the discs. ÃtherÄ
Wise, they'LL hang up or overheat.
•
Check the prime mover's dashÅ
ºounTed air pressure gage. Àhe system
12
JUL 84
shou²d prov½de the
90
PSI neEded to
release the brakes. IF there's not enough
pressure, get iT F½xed or get another
MakE SuRE
yOu havE
a´ lEaSµ
±0 PSI
M9²³ iTV .´.
•
Make sure thÆ air ²ines are proÅ
tected ¼T ¼²³ t½mes. Çhen Towing, don'T
²et them dang³e or underbrush might
snag Them and rip them up´ IF lines are
DOn'µ
lE´
LINES
¶aNglE!
k½nked or smashed, get your mech to
change
t
hem. A²ways ÈuT them ½n the
stoweD posiT½on, hooked To their duÉÊ
my coup³½ngs, when The hoËitzer ½s
emp²aced or parked so the trai²s Won'T
geT dropped on them.
ÀoWing an
m·98
w½th ²ocked or
hang½ng brakes is tough on BoTh the
how½tzer's brake system and the
moVer's eng½ne and transm½ss½on.
Pressure Gage Change
ÌeFore servic¶ng the hydrau²ic acÅ
cumu³ator on your
m90¸
IÀÍ, make"
sure your ch¼rging sysTem has the right
maniFo²d
pressure gage on it. Àhe
wrong gage can cause the system to be
damaged.
Àhe gageÎNSN
6685-00¹764-76º3
ÏcurrentLy ca²²ed fr in ÀM
9-º350-
º59»º0,
has a pressure range oF on²y
0-300
PSI.
JUl 84
13
NSN 66µ5-0¶-527-±3·5
g¼µS yOu µhE ½¾ghµ
¶¸·500
PSI
gagE!
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