ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
3-7. TEST AND ADJUSTMENT PROCEDURES (cont).
BACKLASH IN ELEVATION WORM (cont)
6
Remove aiming circle from tripod.
7
Remove two screws (4), knob (5), scale (6), taper pin (7), adapter (8), and 17 stop rings (9).
8
Loosen top setscrew (10).
9
Using pinned tubular wrench (fig. E-1, appx E), remove ring (11) and felt washer (12).
10 Loosen middle setscrew (13).
Using pinned tubular wrench (fig. E-1, appx E), tighten seat (14), being careful not to bind
11
elevating worm.
12 Tighten middle setscrew (13).
13 Install felt washer (12) and ring (11).
14 Tighten top setscrew (10).
15 Install 17 stop rings (9), adapter (8), taper pin (7), scale (6), knob (5), and two screws (4).
16 Repeat steps 1 thru 5.
17 Repeat steps 6 thru 16 until backlash (error in elevation reading) does not exceed 0.6 mil.
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