C 1, TM 9-6650-221-35
CHAPTER 5
REPAIR
Section I. GENERAL
5-1.
Scope
5-3.
General Maintenance Procedures
This chapter contains instructions for the repair of
TM 9-254 presents general maintenance procedures that
periscope M47.
are most often required in repairing fire control materiel.
Note. This manual contains exploded-view
5-4.
Rescinded
illustrations which depict the complete disassembly of
5-5.
Cleaning
the materiel.
This should not be construed as
authority to disassemble the materiel beyond that
Refer to TM 9-208-1 for procedures most often required in
required to perform operations authorized on the MAC
cleaning fire control materiel.
or to replace parts other than those authorized in the
applicable columns in appendix II.
5-2.
Parts Replacement
In subsequent repair paragraphs, replacement of
authorized parts damaged beyond repair is understood.
Section II. REPAIR
d. Repair and Reclamation. A window having
5-6.
General
chips or fractures may be reclaimed by stoning or grinding
if the chips and fractures do not extend '4-inch beyond the
The paragraphs that follow set
forth the procedures to
clear aperture. Refer to TM 9-254 for instructions on
replace authorized repair parts
and to perform purely
stoning and grinding optical components.
maintenance operations not
involving repair parts
e. Assembly. To assemble the window, frame,
replacement. Refer to Appendix
and housing, proceed as follows:
repair parts.
Note. The key numbers shown in parentheses
5-7.
Replacement of Optical Instrument Window
refer to figure 5-2.
6650-902-9741
(1) Apply a bead of sealing compound, MIL-
S11031, 8030-275-8110 to the frame (2) and install
a.
Removal. Disassemble items 1, 2, and 3 (fig.
window (3) into position.
(2) Clean any excess sealing compound
b. Inspection. Inspect the general condition of
from the window before installing the frame.
the frame and housing to ensure that neither has been
(3) Install frame (2) on housing (17) and
dented, bent or otherwise deformed. Inspect the optical
secure with eight screws (1), applying a small amount of
instrument window for scratches, chips, or other damage
sealing compound, MIL-S-11031, to threads and under the
that would impair its optical performance.
head of each screw.
c. Cleaning. Scrape the surface of the frame
and the housing to remove all traces of the old sealing
5-8.
Replacement of Catch 1240-191-9213
compound and then wipe the complete surface with a cloth
moistened with dry cleaning solvent, 6850-336-8170.
a.
Removal.
Disassemble items, 4, 5, and 6
Caution: Take particular care during any scraping
b.
Inspection.
operations to avoid nicking or gouging the surface of
(1) Inspect the hinge pin and the latching
the frame or housing.
member for proper alinement.
5-1
