TM 9-2350-222-10-3
MAINTAIN MAIN GUN (CHECK AND SHIM OBTURAOTR PAD) - Continued
6. Pull up on breechblock
release lever (H), breech
will close.
7. Press in on plunger
(D) and pull BREECH
OPERATING HANDLE (E)
back until breech is open.
8. Check impression obturator
makes in oil on breech
ring (F).
q If obturator makes
a clear impression
completely around
breech ring (F),
close breech and
go to step 24.
q If impression of
obturator does
not show completely
around breech
ring (F), continue
with step 9.
To Decide How Much Shimming Is Necessary:
NOTE
Use preliminary shims (C) to find out how
thick the permanent shim must be. There are
five preliminary shims. The thinnest is 0.005
inch thick. Next are 0.01, 0.02, 0.03 and 0.04
inch thick.
TA133030
