PS Magazine - TB 43-PS-629

PS, The Preventative Maintenance Monthly

ISSUE 629

APRIL 2005
PS Magazine - TB 43-PS-629 - Page 10 of 33
D
irty air is an engine killer for your Paladin and ammo carrier. That’s why you crew-
men need to keep a close eye on the engine’s air duct hose, NSN 4720-00-999-8589.
Vibration can loosen the clamp,
NSN 4730-00-908-6294, that attaches
the hose to the air cleaner duct. Then
dirty, unfiltered air is pulled in past
the clamp and the engine is damaged.
Help keep your vehicle breathing
easy by checking the clamp for tight-
ness before each operation. Eyeball
the hose for cuts, tears or other dam-
age. Report any problems to your
mechanic.
2.
Turn the valve counterclockwise 12-14
clicks as a starting point.
3.
When you fire the howitzer, or use the
quick release apparatus, fine tune the
valve by turning it clockwise to slow
counterrecoil. Speed up the counterrecoil
by turning the valve counterclockwise.
PS 629
APR 05
17
T
here’s been a disturbing trend found on the M119-series howitzers coming in for
rebuild and repair. Many of the howitzers are arriving with the calibrated flow valve
open all the way (approximately 20-21 clicks).
A completely open valve can allow the weapon to slam into battery after firing.
That causes severe damage to several parts of the howitzer, including the stop plates
and buffer assembly.
Prevent the damage by properly adjusting the valve—
right now!
You’ll find the
valve under the breech on the back of the buffer. Here’s what to do:
1.
Close the valve all the way by turning it clockwise as far as it’ll go.
PS 629
APR 05
16
M109A6 Paladin,
M992A2 Ammo Carrier…
You’ll find the
procedures for
adjusting the
calibrated flow
valve outlined
in WP 0049 00
in TM 9-1015-
252-10.
that was
a
great
round of
firing!
it would’ve been a lot
better for me if my variable
recoil adjusting valve
hadn’t
been all the way open!
Check clamp and hose
before operation
Variable recoil adjusting
valve is under breech on
back of buffer
what’s
wrong!?
what can
I do?
{Gasp!
Choke!}
you
shoulda fixed
my l-l-loose air
d-duct hose!
M119-Series Towed Howitzers…
Adjusting Valve
Needs Adjusting
629.16-17(C)
2/22/05
1:31 PM
Page 1
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