TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 2-11. M146 TELESCOPE MOUNT MAINTENANCE INSTRUCTIONS - continued I a. Disassembly - continued I 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Remove setscrew (51 ) from base plate (52). Remove setscrew (53) that locks threaded ring (54) into Ml 46 telescope mount. Remove and discard self-locking nut (55) from de- flection shoulder screw (56). Remove deflection shoulder screw (56) by turning knob (57) and deflection shoulder screw (56) coun- terclockwise. Remove base plate (52) from Ml 46 telescope mount. Remove threaded ring (54) from Ml 46 telescope mount using fabricated spanner wrench. Remove flat washer (58), concave washer (59), keyed ratchet (60), dial ratchet (61), spring washer (62), and ratchet shield (63). Remove two headless straight pins (64) from ratchet shield (63). Remove knob (57) and associated parts. Remove concave washer (65), round nut (66), spring washer (67), scale dial (68), and disk (69) from knob (57). Remove setscrew (70) from round nut (66). Remove and discard preformed packing (71 ) from threaded ring (54). Remove and discard preformed packing (72) from Ml 46 telescope mount. Remove plate spacer (73) by removing three cap screws (74) and three Iockwashers (75). Discard Iockwashers. If installed, remove shims and retain for reassembly. 2-10