TM-9-1240-400-34-P
TELESCOPE; PANORAMIC: M115, ELBOW: M139, MOUNT: M138 AND M137
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1993
TM-9-1240-400-34-P - Page 163 of 344
TM 9-1240-400-34&P
Table 5-3.
GENERAL SUPPORT TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2.
ELEVATION CONTROL (1) EXCEEDS 0.5 MIL BACKLASH.
a.
Check for loose or worn bearings.
Replace bearings.
Refer to page 540.
b.
Check for worn worm shaft assembly.
Replace worm shaft assembly.
Refer to page 5-40.
3.
ELEVATION CONTROL (1) REQUIRES TORQUE IN EXCESS OF 13.00 IN.-LB (1.47 N-m) TO ROTATE.
a.
Check V-bearing tightness.
Adjust torque.
Refer to page 5-59.
b.
Check for worn worm shaft and/or bearings.
Replace worm shaft and/or bearings.
Refer to page 540.
5-9
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