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 109 of 590

TM 9-1240-401-34&P

9 Apply sealing compound (item 13, appx B) to

setscrew holes.

e. RETICLE ACCURACY INSPECTION

1 View through M118A2/M118A3 elbow telescope

eyepiece (1). Check that angular value between

zero range mark and maximum range mark (60-mil

line) is 60 ± 0.5 mils. Check that boresight mark of

the M118A2/M118A3 elbow telescope reticle is on

the plus 20-mil mark of the collimating

projector (2)

and the 60-mil mark of the M118A2/M118A3 elbow

telescope reticle is on the 40-mil mark of the

collimating projector (2).

2

If error exists, send M118A2/M118A3 elbow tele-

scope to depot maintenance.

f. COLLIMATION INSPECTION

View through M118A2/M118A3 elbow telescope eye-

piece (1) and check that the boresight mark is 20 roils (±

1 roil) above the geometric axis of the target of collimat-

ing projector (2) and that the vertical reticle line is in co-

incidence with the vertical target line within 0.5 mil.

I

g. LEVEL ADJUSTMENT

I

1

2

3

4

5

6

Check that level (1) vial bubble is within the center

graduation marks of the level(1) vial.

Loosen threaded ring (2).

Engage fabricated eccentric tool into holder (3) and

threaded ring (2).

Insert a straight blade screwdriver through the cen-

ter hole in the eccentric tool.

Adjust cam (4) until level vial bubble is centered.

Tighten threaded ring (2), being careful not to dis-

turb setting of level vial.

3-5 1