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 276 of 590

TM 9-1240-401-34&P

5.1-19. M15 QUADRANT MAINTENANCE INSTRUCTIONS - continued

c. Assembly - continued

NOTE

Steps 13 through 24 apply to replacement of

shouldered shaft assembly. Steps 25 through

31 apply to reinstallation of existing

13

14

15

16

17

18

19

20

shouldered shaft assembly.

Slide ball socket seat (29) onto long end of new

shouldered shaft assembly (30) with internal

beveled portion of ball socket seat (29) positioned

against bearing of shouldered shaft assembly (30).

Slide spur gear (31) onto shouldered shaft assembly

(30) with raised portion of gear away from bearing.

Slide worm gear (32) onto shouldered shaft

assembly (30) with setscrew hole of worm gear (32)

facing spur gear (31).

Temporarily install two setscrews to secure worm

gear (32) and spur gear (31) tightly against shoulder

of shouldered shaft assembly (30) until holes for

tapered pins (33) are drilled and reamed.

Drill and ream two holes in shouldered shaft

assembly (30) for tapered pins (33). Remove

setscrews and apply grease (item 6, appx B) to

gears.

Remove gears (31 and 32) from shouldered shaft

assembly (30).

Install shouldered shaft assembly (30) and ball

socket seat (29) through boss on housing (10) and

install gears (32 and 31) on shouldered shaft

assembly (30).

Aline holes in worm gear (32) and spur gear (31)

with holes in shouldered shaft assembly (30) and

install two tapered pins (33).

5.1-42

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