REASSEMBLY - TM-9-4931-710-14-P0043

TM 9-4931-710-14&P

5-6

OBJECTIVE CELL ASSEMBLY MAINTENANCE INSTRUCTIONS-CONTINUED

CLEANING

REPAIR

Repair is by replacement of authorized parts as required

Clean all parts per TM 9-254.

REASSEMBLY

Burr four holes (1).

Install objective lens (3) in cell (2), concave side

first.

Install spacer (4), flat side out.

Install objective lens (5) with flat side against

spacer (4).

Spot sealing compound in four places, equally

spaced, to secure objective lens (5) to inside

diameter of cell (2).

Apply a coat of grease (Item 6, Appendix D) to new

packing (6). Install new packing (6) and retaining

Note

ring (7).

If the four sealant holes

Secure objective lens (3) in place by applying

have not been drilled in the

sealing compound to lens (3) through four holes

cell, begin with step A. If

(1).

they are present, proceed to

step C.

Drill four 1/8-in. diameter holes (1) in cell (2) 9/16

inch from the threaded end.

Note

Burrs must be removed

from the inside diameter of

the cell, to ensure the

objective lens can be

positioned properly.

Change 1 5-17