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 234 of 590

TM 9-1240-401-34&P

5-26. M117/M117A2 PANORAMIC TELESCOPE FINAL INSPECTION AND ADJUSTMENT

- continued

I

o. GUNNER’S AID KNOB TORQUE INSPECTION

1 Remove headless straight pin (1), gunner’s aid

knob (2), shim(s) (3), and seal (4).

2 Apply grease to inside diameter of seal (4). and

sealing compound to outside diameter of seal (4).

Install seal (4), shim(s) (3), gunner’s aid knob (2),

and headless straight pin (1).

3 Using torque adapter (8213929) (Item 2, appx F)

and torque wrench, check that running torque of

gunner’s aid knob (2) is 1 to 4 pound-inches (0.11

to 0.45 N-m) in both directions.

4 Add or remove shim(s) (3) until required torque is

achieved.

I

p. AZIMUTH KNOB TORQUE INSPECTION

1

2

3

4

5

6

7

Using torque adapter (8599917) (Item 6, appx F)

and torque wrench, check that running torque of

azimuth knob (1) is 4 to 8 pound-inches (0.45 to

0.90 N-m) in both directions.

If requirement in step 1 cannot be met, remove

azimuth knob (1) (ref. para 5-13).

Remove cover (2) (ref. para 5–1 3).

Temporarily install azimuth knob (1), torque

adapter, and torque wrench.

Using adjustable spanner wrench, adjust retainer

(3) until required torque in step 1 is achieved.

Scribe a line on retainer (3) and housing (4). Back

out retainer (3) and apply small amount of sealing

compound and turn in retainer (3) to scribe marks.

Install cover (2) (ref. para 5-17) and azimuth knob

(1) (ref. para 5-13).

q. PURGING AND CHARGING

Refer to TM 750-116 for purging and charging proce-

dures.

5-60