TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 5.1-20. COUNTER ASSEMBLY MAINTENANCE INSTRUCTIONS - continued c. Assembly - continued 15 16 17 18 19 20 21 22 23 24 25 Apply grease (item 6, appx B) in hole of boss on base (A) and hole of bracket(B). Slide spur gearshaft (10) through boss of base (A) and slide retaining ring (11) on shaft of spur gear-shaft (10), being careful to spread retaining ring (11) only as far as necessary. Position spur gear (12) so that teeth of spur gear mesh with gear of differential assembly (8) and slide shaft of spur gearshaft (10) through spur gear (12) and into hole of bracket (B). Secure spur gearshaft (10) in base (4) with retaining ring (11). Aline holes of spur gear (12) with hole in spur gearshaft (10) and secure with tapered pin (13). Apply grease (item 6, appx B) to spur gear (12) and to teeth of spur gearshaft (10). NOTE If correction counter is to be replaced, perform steps 21 thru 30. If existing counter is to be reinstalled, go to step 31. Slide spur gear (14) on shaft of rotating counter (15) and temporarily install, but do not tighten a setscrew in spur gear (14). Remove two straight pins (16) from base (4). Position rotating counter (15) on base (4) and install, but do not tighten four screws (17) and four new lockwashers (18). Aline spur gear (14) with teeth of spur gearshaft (10) and temporarily secure spur gear (14) to shaft of rotating counter (15) with setscrew. Tighten four screws (17). Mark holes for two straight pins (16) by partially drilling through existing holes in base (4). 5.1-52 Change 1