ASSEMBLY - continued -820360552

TM 9-1240-375-34&P

0093 00

ASSEMBLY - Continued

11.

Apply 0.063 in. (1.600 mm) bead of sealing compound (item 13, WP 0152 00) around entire rim of

optical instrument window (10). Place optical instrument window in head housing (2).

12.

Apply a light coat of grease (item 15, WP 0152 00) to nonmetallic round seal (11) and install over

optical instrument window (10).

13.

Place cover assembly (12) in position on head housing (2).

14.

Apply a coat of sealing compound (item 13, WP 0152 00) to threads of four machine screws (13) and

install to secure cover assembly (12).

15.

Apply a coat of grease (item 15, WP 0152 00) to new O-ring (14) (item 14, WP 0134 00) and install on

threaded machine plug (15).

16.

Apply a light coat of grease (item 16, WP 0152 00) to detent plunger (16) and install in head housing

(2).

17.

Apply sealing compound (item 13, WP 0152 00) to threads of machine threaded plug (15).

18.

Install compression helical spring (17) and machine threaded plug (15).

19.

Apply a coat of grease (item 16, WP 0152 00) to flat washer (18) and install in head housing (2).

20.

Apply a light coat of grease (item 16, WP 0152 00) to plunger (19) and screw into telescope actuator

(20). Install assembled plunger and telescope actuator into head housing (2).

21.

Apply a coat of grease (item 15, WP 0152 00) to new O-ring (21) (item 8, WP 0134 00) and install in

machine threaded bushing (22).

22.

Screw machine threaded bushing (22) into head housing (2).

23.

Apply sealing compound (item 13, WP 0152 00) to threads of external screw (23) and install.

24.

Apply sealing compound (item 13, WP 0152 00) to setscrew (24) and install to prevent machine

threaded bushing (22) from turning.

25.

Position knob (25) on telescope actuator (20) and secure in place using two setscrews (26) which have

been coated with sealing compound (item 13, WP 0152 00).

26.

Apply a coat of sealing compound (item 13, WP 0152 00) to threads of safety relief valve (27) and

install.

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