TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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3-25 TM 9-1240-401-34&P d. Assembly 1 2 3 4 5 6 7 8 NOTE Seal over external side of adapter 10543763 and lamp MS25236-8623 using sealing com- pound (item 13, appx B) if it has not already been done. New manufactured level mounts will not contain an adapter and lamp. Apply sealing compound (item 13, appx B) to the surface of mount (10) where window (24) is seated. Install window (24) and apply additional sealing compound around the window. Install new shim (23) and using 1-25/32 and 1-51/64 inch tubular spanner wrench, install retainer (22). If headless straight pin (18) was removed, redrill using No. 54 (0.055) drill; ream for drive fit in mount (10). End of headless straight pin (18) must protrude far enough into hole in mount to engage slot in end of level (13) when installed. Install level (13), making sure that slot in end of level engages headless straight pin (18). Install cam (12), holder (11), and threaded ring (9) in front of level (13). Do not tighten threaded ring (9) until adjustment of level (13) has been com- pleted (ref. p 3-26). Install two sleeve spacers (21), circuit board as- sembly (7), two new lockwashers (20), and two machine screws (19). If headless straight pins (17) were not removed, install mirror (16) over headless straight pins (17) and secure with two new Iockwashers (15) and two cap screws (14). If headless straight pins (17) were removed, redrill using No. 54 (0.055) drill; drill 0.450 inch (11.43 mm) deep. Ream for drive fit in mount (10) and slip fit in mirror (16). Install mirror (16) over headless straight pins (17) and secure with two new lock- washers (15) and two cap screws (14). Apply adhesive to groove on bottom of mount (10) and to one side of new preformed packing (25). Install preformed packing (25) in groove.