TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-400-34&P Table 5-2. DIRECT SUPPORT TROUBLESHOOTING (CONT) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION b. Check for worn worm shaft assembly. Refer to page 5-29. Replace worm shaft assembly. Refer to page 5-29. 4. CROSS-LEVEL CONTROL (2) REQUIRES TORQUE IN EXCESS OF 11.00 IN.-LB (1.24 N-m) TO ROTATE. a. Check V-bearing tightness. Adjust torque. Refer to page 5-29. b. Check for worn worm shaft and/or bearings. Replace worm shaft and/or bearings. Refer to page 5-29. LEVEL ASSEMBLY 5. CROSS-LEVEL BUBBLE (3) OR ELEVATION LEVEL BUBBLE (4) DOES NOT CENTER WITHIN 1 GRADUATION. Observe visually. Adjust level vials (3 and 4). Refer to page 5-25. 6. NO ILLUMINATION IN LEVEL VIALS (3 AND 4). Observe visually. a. Replace burned out LEDs. Refer to page 5-25. b. Replace defective variable resistor. Refer to page 5-25. c. Clean or replace defective lens caps. Refer to page 5-25. COVER ASSEMBLY 7. NO ILLUMINATION IN COUNTERS (5). Observe visually. a. Replace burned out electronic component. Refer to page 5-20. b. Replace defective variable resistor. Refer to page 5-20. 5-7