TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 120 of 590

TM 9-1240-401-34&P

4-8. DIRECT SUPPORT SYMPTOM INDEX

MOUNTING SURFACES

Mounting surfaces do not seat Ml 17/M1 17A2 panoramic

CROSS-LEVEL MECHANISM

Cross-level mechanism

Cross-level mechanism

Cross-level mechanism

(1.24 N-m) to rotate . .

LEVEL ASSEMBLY

knob exceeds 0.5 mil backlash . .

telescope correctly

. . . . . . . . . . . . . . . .

knob is erratic and rough during movement . . . . . . .

knob requires torque in excess of 11 pound-inches

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

No illumination in cross-level or pitch level . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting

Procedure

(Page)

. . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . 4-7

. . . . . . . . . . . . . . . . . . 4-7

. . . . . . . . . . . . . . . . . . 4-7

. . . . . . . . . . . . . . . . . . 4-7

4-9. DIRECT SUPPORT TROUBLESHOOTING

MALFUNCTION

TEST OR

INSPECTION

LOCATION

CORRECTIVE ACTION

MOUNTING SURFACES

1.

MOUNTING SURFACES (1) DO NOT SEAT

M117/M117A2 PANORAMIC TELESCOPE

CORRECTLY.

Observe visually.

a. Clean mounting surfaces with

cleaning compound (item 3,

appx B).

b. Remove burrs with abrasive

cloth (item 4, appx B) dipped

in cleaning compound

(item 3, appx B).

4- 6