PS Magazine - JANUARY 1986
PS, The Preventative Maintenance Monthly
ISSUE 398
JANUARY 1986
The 5-ton truck does more than pull ±e M198 howi²er fom Pint A to point
B.
I
aLso provides the air pressure to operate the gun's brakes.
In hilly countR, your trUck could Use so much air to slow or stop ±at tHe
gUn's brakes w³ll star´ to apply.
Wat happens is this: It ´akeS between 65µ90 ¶·I air pressure to release tHe
brakes on an M198. Any t¸me tHe pressure goes lower than 90 ¶·I, the b¹akes
can sº to apply.
Your trUck's
a
compressor has a cutµ³n pressure oF 105 ¶·I and a cut-out
pressure oF 125 ¶·». ·o, when you're hauling down that
hl
using air p¹essure
to slow down, you could be bleeding p¼essUre o½ the gUn's brake system, caus¾
ing it to begiN to lock up.
It's unavoidable, you say? You have to use your brakes, right? ¿ell, there
is something you can do. ·hiÀ down beÁre you star´ down.
Âet ´he engine help hold back against your rig's weigHt.
Keep an eye glued to the air pressure gage. ¿hen the pressure goes below
9Ã ¶·», stop and let the pressure build up aga³n.
AL
±is maneuverÄg is t¸me-consuming, but your mission is to get ±at howi²er
to its destination. It won't be going anywhere iFthe brakes lock up and buÅ out.
12
J±N 86
Close the traiLs on your
M ²9³
with
caRe, crewmen, oR you can end up with
no brakes.
The brake hose Running fom the Right
trail to
the bottom carRiage can be
pinched in the tRail hinge. Then you'LL
have
littLe
oR
no
braking
FR
the
howitzer.
I± the hose buRsts, the howitzer brakes
wilL lock up. ²± you³Re using the
M9´3
tRuck, its brakes wiLL locK up, too. On
the
M54µ´
and
M³²3,
you Won't have
any bRakes at aLL. ´emembeR to watch
the hose careµLly when closing the
tRails. ¶eep the hose cLeaR o± the hinge.
Thumbscrews for Stowage BoxEs
Get the ´humbscrews useD on the cab vehicular boxes on M109-series ·¶
howi²ers with Æ·Æ 5325µÇµ290µ3820. THe screws worÈ on botH
the
right- ÉnÊ
leÀ-side boxes.
M114A2 Howi±er ²eadspacinG
Âisten up, ËEdlegs! Bad headspacing between the Ì mecHan¸sÍ and tHe
end oF the obtÎrator spindle can hur´ you. One soldier was injured recentLy wHen
´he Ïring mechanism blew oUt oF ±e breecH assembly. Bad headspacing caÐ ÉLso
cause sÑlit pr³mer casings and burred Ïring mechanism locÈ stopsÒ
Check headspace now using gage, Æ·Æ 4933-Ç-722µ5952, wÓ³cH is in yoUr
BÔ. Õe´ails on howÖto are on ¶age 114.1 oF C5, TM 9-1025-2ǵ12.
J±N 86
¶·
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