TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-400-34&P 2-11. MAINTENANCE OF HEAD ASSEMBLY (CO DISASSEMBLY (CONT) 9 Using adjustable spanner wrench, remove retainer (15) and preformed packing (16) Discard preformed packing. 10 Remove nonmetallic washer (17), spring (18), and nonmetallic washer (19). 11 Remove plug (20), spring (21), and bearing (22). 12 Remove worm shaft (7) with self-locking nut (23), flat washer (24), and bearing (25) attached. 13 Remove and discard self-locking nut (23), flat washer (24), and bearing (25) from worm shaft (7). 14 Remove two setscrews (26). NOTE To aid in removal of prism, install two screws (1) on head assembly. 15 Using adjustable spanner wrench, remove externally threaded ring (27), preformed packing (28), and prism (29) Discard preformed packing. 2-24