PS Magazine - TB 43-PS-613

PS, The Preventative Maintenance Monthly

ISSUE 613

DECEMBER 2003
PS Magazine - TB 43-PS-613 - Page 6 of 33
PS 613
DEC 03
9
G/VLLD…
Order
Parts,
Not
Whole
Kit
DEC 03
8
M198 Towed Howitzer…
Check Scale Alignment
P
art of MWO 9-1025-21-50-5 (Jun 93) for the M198 towed howitzer included the
installation of new equilibrator adjustment scales, NSN 6695-01-386-2774 and
6695-01-386-8345. Unfortunately, the installation instructions were a little faulty.
The instructions said to use the old scale’s bottom screw hole for locating the new
scales. That didn’t take into account the amount of space left above or below the
slide, NSN 5340-01-040-0623.
With the new scales located by the old scale’s bottom screw hole, the slide’s
pointer can’t be adjusted up to the +3 setting. Trying to manhandle the adjusting
screw to force the slide up puts pressure on the top carriage tower’s weldment. The
end result is a cracked or bent weldment.
When you need
new supplies
for the G/VLLD
cleaning kit,
DO
NOT
order the
entire kit, NSN
Screw cap bottle, NSN 8125-00-824-9058
Brush, NSN 7920-00-205-0565
Lens paper, NSN 6640-00-663-0832
50 plastic bags, NSN 8150-00-137-9133
1.
Depress the cannon to a near-level
elevation.
2.
Use the equilibrator adjustment screw
to move the slide in the minus direction
until it’s at its lowest position.
3.
Measure up 1 inch from the slide’s
pointer. If the measurement is aligned
with 0 on the scale, the howitzer is good
to go. If it’s not on 0, contact DS mainte-
nance. They’ll reposition the scale and drill
new holes to put it in the right position.
Most of the
M198s that
were improperly
modified have
been fixed.
Some haven’t.
Your mechanic will
need to make sure your
howitzer’s equilibrator
scales are correctly
positioned by doing
this…
The kit costs
more than $1
7
0.
You can order
the individual
parts of the
kit for less
than $110 with
these NSNs…
Turn equilibrator adjustment screw…
…to move slide to bottom position
darn it!
I’m
gonna get that
slide up to +3
if it kills me!
hey! stop!
it’s killin’
me!
1 inch between pointer and 0 mark?
613. 08-09 (C)
10/30/03
4:40 PM
Page 1
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