TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 26 Remove four screws (17), four lockwashers (18), and rotating counter (15) from base (4). CAUTION When drilling correction counter, extreme care must be exercised to prevent damage to rotating counters. 27 Finish drilling two holes in rotating counter (15) for two straight pins (16) and drill shaft of rotating counter (15) for straight pin (19). Install straight pin (19) to secure spur gear (14) to shaft of rotating counter (15). 28 Position rotating counter (15) on base (4) and install, but do not tighten four screws (17) and four lockwashers (18). 29 Aline holes in rotating counter (15) with holes in base (4). Install two straight pins (16) and tighten four screws (17). 30 Remove setscrew temporarily installed in spur gear (14). NOTE If correction counter is to be reinstalled, perform steps 31 thru 33. 31 Aline holes of spur gear (14) to holes in shaft of rotating counter (15) and install straight pin (19). 32 Install rotating counter (15) over two straight pins (16) and install four screws (17) and four new lockwashers (18). 33 Apply grease (item 6, appx B) to spur gear (14). 34 Rotate spur gearshaft (10) and check that counters operate smoothly without binding. Change 1 5.1-53