TM 9-2350-222-10-3
MAINTAIN MAIN GUN (CHECK AND SHIM OBTURATOR PAD) -Continued
14. Using clean rag, wipe
oil from obturator
pad (G).
15. Using hand pump oiler,
coat surface of breech
ring (F) with thin coat
of oil.
16. Pull upon breechblock release handle (H), breech will close.
17. Press plunger (D) and move BREECH OPERATING HANDLE (E) back and down
until breech is locked open.
NOTE
18. Check impression obtura-
If obturator does not seat after using
tor makes in oil on
shims up to 0.02 inch thickness, notify
breech ring (F).
support maintenance.
q If obturator makes
a clear impression
completely around
breech ring (F),
breechblock seals
when closed.
Continue with step 19.
q If impression of
obturator does
not show completely
around breech
ring, breechblock
is not sealed.
Repeat steps 9
thru 17 using combi-
nation of prelimi-
nary shims to
add 0.005 inch
at a time, to prelimi-
nary shims already used.
TA133032
3-202