TM-9-1290-262-24&P Technical Manual for M2A2 Aiming Circle Download
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ARMY TM 9-1290-262-24&P MARINE CORPS TM 00476C-24&P AIR FORCE TO 49A7-3-72/74 52 53 54 55 56 57 58 59 60 61 Install flat washer (52) and adapter (53) on worm shaft (44). Aline adapter pin hole with pin hole in shaft and install taper pin (54). NOTE If a new worm was installed, perform steps 53 thru 55 as follows: Position scale dial (55) over adapter (53) and push toward azimuth index (51). Leave a clearance of no more than 0.015 in. (0.381 mm) between scale dial and azimuth index. Remove scale (55), but do not move adapter (53). Using hole in adapter (53) as a guide, drill a No. 52 hole in worm shaft and ream for No. 6/0 pin. Install pin (54). Install scale dial (55), knob (56), and two screws (57). Do not tighten screws until. after collimation adjustment. Lightly lubricate ball socket seat (58), worm shaft (59), sleeve bushing (60), spring (61), and all bearing and working surfaces inside body assembly with grease (item 6, appx D). Place ball socket seat (58) on worm side of ball, alining slot in ball socket seat with setscrew hole in housing. To install worm shaft (59) in body assem- bly, push in and rotate worm onto internal gear until ball socket seat (58) is in place within body assembly. Check that slot in ball socket seat (58) is still alined with setscrew hole in body as- sembly. NOTE Setscrew (62) will be tightened during backlash adjustments. Install sleeve bushing (60), spring (61), and machine thread plug (63). Tighten machine thread plug (63) securely. 3-23