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 213 of 344

TM 9-1240-400-34&P

6

Adjust elevation machine thread plug (9) using a

screwdriver.

Check the torque or backlash and if still

excessive, proceed to step 7.

7

Remove tapered pin (10), knob (1), and nonmetallic

washer (11) from worm shaft (12).

8

Adjust externally threaded ring (13) using spanner

wrench (8284045) to adjust torque or backlash.

9

Install nonmetallic washer (11) and knob (1) on

worm shaft (12) and secure with tapered pin (10).

CHECKING AND ADJUSTING ELEVATION KNOB TORQUEAND BACKLASH

1

Using torque wrench and torque adapter (8599909),

measure the torque required to turn elevation knob

(1).

The torque shall be between 5.00 and 13.00 in.-

lb (0.57 and 1.47 N-m).

If not, adjust according to

adjustment procedure.

Refer to step 6.

2

Rotate elevation knob (1) in one direction to center

bubble in elevation vial (2).

3

Scribe a line on boss (3) and elevation knob (1).

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