TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM9-1240-401-34&P 4-10. GENERAL SUPPORT SYMPTOM INDEX Troubleshooting Procedure (Page) COUNTER BOX ASSEMBLY Elevation handwheel is erratic and rough during movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..4-8 Elevation handwheel exceeds 0.5 mil backlash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...4-8 Elevation handwheel requires torque in excess of 11 pound-inches (1.24 N-m) to rotate . . . . . ...4-9 CROSS-LEVEL MECHANISM Cross-level mechanism knob requires torque in LEVEL ASSEMBLY excess of 11 pound-inches (1.24N-m) to rotate .. 4-9 Cross-level bubble or pitch level bubble do not center within one graduation . . . . . . . . . . . . . . . ...4-9 4-11. GENERAL SUPPORT TROUBLESHOOTING MALFUNCTION TEST OR INSPECTION LOCATION CORRECTIVE ACTION COUNTER BOX ASSEMBLY 1. ELEVATION HANDWHEEL (1) IS ERRATIC AND ROUGH DURING MOVEMENT. step 1. step 2. step 1. Step 2. Check for worn wormshaft assembly. Notify depot maintenance. Check for worn gears. Notify depot maintenance. 2. ELEVATION HANDWHEEL (1) EXCEEDS 0.5 MIL BACKLASH. Check for loose or worn bearings. Notify depot maintenance. Check for worn wormshaft Notify depot maintenance. assembly. 4-8