TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 316 of 590

6-6

TM 9-1240-401-34&P

6-10. M42 PERISCOPE MAINTENANCE INSTRUCTIONS - continued

a. Disassembly - continued

8

9

10

11

12

13

14

NOTE

Remove windows (16 and 25) only if neces-

sary for replacement.

Remove window (16) by tapping on side facing in-

terior of M42 periscope.

Remove all fragments of glass and scrape off all

adhesive material. Avoid enlarging opening.

Remove 12 machine screws (1 7), 12 Iockwashers

(18), and cover assembly (19). Discard lockw-

ashers.

Remove two headless straight pins (20) only if

damaged.

Remove three machine screws (21), three lock-

washers (22), retaining ring (23), and seal (24).

Discard lockwashers.

Remove window (25) by tapping side facing interior

of M42 periscope.

Remove all fragments of glass and scrape off all

adhesive material. Avoid enlarging opening.

I

b. Repair

1 Remove corrosion, grease, and dirt from all parts.

Refer to TM 9-254 for cleaning instructions.

2 Visually inspect for missing or damaged parts.

3 Repair or replace parts in accordance with author-

ized parts listed in appendix D.