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 162 of 344

TM 9-1240-400-34&P

5-6.

TROUBLESHOOTING PROCEDURES (CONT).

GENERAL SUPPORT SYMPTOM INDEX

Troubleshooting

Procedure

(Page)

ELEVATION ASSEMBLY

Elevation control is erratic and rough during movement .

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5-8

Elevation control exceeds 0.5 mil backlash.

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5-9

Elevation control requires torque in excess of

11.00 in.-lb (1.24 newton-meters) to rotate

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5-9

Table 5-3.

GENERAL SUPPORT TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ELEVATION ASSEMBLY

1.

ELEVATION CONTROL (1) IS ERRATIC AND ROUGH DURING MOVEMENT.

a.

Check for worn worm shaft assembly.

Replace worm shaft assembly.

Refer to page 5-46.

b.

Check for worn gears in gear sector.

Replace worn gears.

Refer to page 5-46.

5-8