TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-401-34&P 5-13. M117/M117A2 PANORAMIC TELESCOPE MAINTENANCE INSTRUCTIONS - continued I a. Disassembly - continued 11 12 13 14 15 16 17 18 19 20 21 Remove four shims (21) and two shims (22). Dis- card shims. Remove two windows (23), only if damaged. Remove setscrew (24). Loosen setscrew (25) and push elevation knob (26) into the housing as far as possible. Tighten setscrew (25). Unscrew elevation knob (26) as far as possible from shouldered shaft (27) and repeat step 14 as necessary to remove elevation knob (26). Remove setscrew (25) and shouldered shaft (27). Remove and discard preformed packing (28). Remove two plugs (29) and two preformed pack- ings (30). Discard preformed packings. Remove four machine screws (31), four lock- washers (32), and two strikes (33). Discard lock- washers. Remove machine screw (34) and reset counter knob (35). Remove two machine screws (36), access cover (37), and gasket (38). Remove preformed packing (39) from access cover (37). Discard preformed packing and gasket. b. Repair 1 Remove corrosion, grease, and dirt from all parts. Refer to TM 9-254 for cleaning instructions. 2 Visually inspect for missing or damaged parts. 3 Repair or replace parts in accordance with author- ized parts listed in appendix D. 5-12