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TROUBLESHOOTING PROCEDURES OPTICAL INSTRUMENT ROCKER ASSEMBLY
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TM-9-1240-375-34-P Quadrant Fire Control: M17 (1290-01-037-3883) and M17A1 (1290-01-515-8260); Mount Telescope and Quadrant: M171 (1240-01-039-7273) Manual
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Chapter 5. DIRECT SUPPORT TROUBLESHOOTING PROCEDURES
TM 9-1240-375-34&P
0022 00
OPTICAL INSTRUMENT ROCKER ASSEMBLY
Table 1. Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1
1 fc 0 3 7
Replace worm shaft assembly
1. CROSS LEVEL CONTROL IS
1. Check for worn or defective
ERRATIC AND ROUGH
worm shaft assembly.
DURING MOVEMENT.
2. Check for worn or defective
Replace gear sector (WP 0070 00).
gears in gear sector.
Replace V-bearing or plain
2. CROSS LEVEL KNOB (1)
1. Check for loose or worn
EXCEEDS 1.5-MIL
V-bearing or plain bearing.
BACKLASH.
Replace worm shaft assembly
2. Check for worn or defective
worm shaft assembly.
3. CROSS LEVEL KNOB (1)
1. Check V-bearing tightness.
Loosen plug, and adjust torque
REQUIRES TORQUE IN
EXCESS OF 12.00 IN.-LB
(1.36 N-M) TO ROTATE.
2. Check for defective worm shaft
Replace worm shaft assembly,
assembly, plain bearing, or
plain bearing, or V-bearing
V-bearing.
END OF WORK PACKAGE
0022 00-2

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