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 256 of 590

TM 9-1240-401-34&P

5.1-14. M15 QUADRANT MAINTENANCE INSTRUCTIONS - continued

c. Assembly - continued

16

17

18

19

20

21

22

23

24

25

NOTE

Both correction counters and elevation

counter must be zeroed prior to installing knob

assembly.

If removed, install two straight pins (23).

Apply grease (item 6, appx B) to new preformed

packing (24) and install into groove (25) of cover

assembly (14).

Position knob assembly (26) at the midway point

between stops (approximately 5-1/2 turns from one

stop).

Install base (27) on knob assembly (26).

Install knob assembly (26) with base (27) on cover

assembly (14) and secure with three screws (28)

and three new lockwashers (29).

If numbers of correction counter (30) do not aline

within 1/16 inch (1.588 mm), adjust two setscrews

(31) to aline numbers.

Check that upper correction counter (30) registers at

least +50 mils when knob assembly is turned

clockwise to stop. Check that lower correction

counter (30) registers at least -50 mils when knob

assembly is turned counterclockwise to stop.

If removed, install spring tension clip (32) and plate

spacer (33) on housing and secure with two screws

(34).

If removed, install identification plate (35) and two

screws (36) on housing.

If removed, install instrument light (37).

5.1-22

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