TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
Page 94 of 344
TM 9-1240-401-34&P 3-22. EYEPIECE AND ERECTOR LENS SUBASSEMBLY MAINTENANCE INSTRUCTIONS - continued c. Assembly 1 2 3 4 5 6 7 8 9 NOTE If fixed ratchet is to be replaced, perform steps 1 thru 5. If existing parts are reinstalled, pro- ceed to step 6. Apply grease (item 7, appx B) to new preformed packing (30) and install in groove of seal (18). Install section of seal (18) with preformed packing (30) installed, spacer (29), and fixed ratchet (26) on rear housing (14). Position fixed ratchet (26) with area to be drilled in a different location from original pin holes in rear housing (14). Secure fixed ratchet (26) with six new Iockwashers (28) and six cap screws (27). Drill holes for two headless straight pins (31 ), using a No. 15 (0.180) drill; drill into rear housing (14) 3/8 inch (9.53 mm) deep. Ream for drive fit in the rear housing (14) and fixed ratchet (26). Drive two headless straight pins (31) into holes drilled in step 4 above. NOTE Follow steps 6 thru 10 if reinstaIling existing parts. Apply grease (item 7, appx B) to new preformed packing (30) and install in groove of seal (18). Install section of seal (18) with preformed packing (30) installed, spacer (29), and fixed ratchet (26) on rear housing (14). If removed, aline headless straight pins (31) with pin holes in rear housing (14) and secure with six new Iockwashers (28) and six cap screws (27). Apply grease (item 7, appx B) to new preformed packing (25) and install in groove of rear housing (14) opposite the side where fixed ratchet (26) has been installed. 3-36