ARMY TM 9-1240-379-34
MARINE CORPS TM 04332A-34
3-2. HEAD ASSEMBLYMAINTENANCE INSTRUCTIONS. (cont)
lNSPECTION/CLEANING/REPAIR
Inspect all parts for deterioration.
1
4 Remove old sealing compound from
recess in housing and from strips used to
Check machine screws for worn or
2
retain optical instrument window using
damaged threads.
dry cleaning solvent.
Make sure replacement optical instru-
3
5 If original optical instrument window has
ment window is free of chips, cracks,
shattered, make sure that interior of head
scratches, and discoloration.
assembly is free of glass chips and
particles.
WARNING
Dry cleaning solvent is flam-
6 Replace any damaged, broken, or missing
mable and should not be used
parts. See TM 9-1240-379-34P.
near open flame, It has a dry-
ing effect on the skin. Use
gloves, as they may prevent
cracks in the skin and, in the
case of some individuals, mild
irritation or inflammation. Use
dry cleaning solvent in well
ventilated areas.
REASSEMBLY
Position new optical instrument window
1
(1) in housing of head assembly (2) and
apply sealing compound in beveled
recess around edge of optical instrument
window.
Secure optical instrument window (1)
2
with strip (3) at bottom using five
machine screws (4) and strip (5) at top
using five machine screws (6).
After optical instrument window has
3
been installed in head assembly, purge
and charge in accordance with TM
750-116.
