TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P I 4-21. COUNTER BOX ASSEMBLY (COUNTERS) MAINTENANCE INSTRUCTIONS - continued I a. Disassembly I 2 3 4 1 Remove four machine screws (1) and four lock- washers (2). Discard Iockwashers. Remove cover (3) with related parts from counter box assembly (4). Remove two headless straight pins (5) only if nec- essary. Remove plug (6) only if necessary for replacement. NOTE New counter box assemblies are tapped and do not require nut (7). 5 Remove air valve cap (8), valve core (9), nut (7), purging valve stem (10), and retaining strap(11 ). 6 Remove four machine screws(12) and four lock- washers (13). Discard Iockwashers. 7 Remove base(14) and related parts from cover (3). 8 Remove setscrew(15) and plug (16). 9 Drive out headless straight pin (17) and remove collar (18) and worm setscrew (19). 4-40