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 160 of 344

TM 9-1240-400-34&P

5-6.

TROUBLESHOOTING PROCEDURES (CONT).

Table 5-2.

DIRECT SUPPORT TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

MOUNTING SURFACES

1.

MOUNTING SURFACES (1) DO NOT SEAT Ml15 TELESCOPE CORRECTLY.

Observe visually.

Remove burrs and clean mounting surfaces.

Refer to TM 9-254.

CROSS-LEVEL ASSEMBLY

2.

CROSS-LEVEL CONTROL (2) IS ERRATIC AND ROUGH DURING MOVEMENT.

a.

Check for worn worm shaft.

Replace worm shaft.

Refer to page 5-29.

b.

Check for worn gears in gear sector.

Replace gear sector.

Refer to page 5-40.

3.

CROSS-LEVEL CONTROL (2) EXCEEDS 1.0 MIL BACKLASH.

a.

Check for worn bearings.

Replace bearings.

Refer to page 5-29.

5-6