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 138 of 590

TM 9-1240-401-34&P

4-15. LEVEL ASSEMBLY MAINTENANCE INSTRUCTIONS - continued

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d. Assembly - continued

14 If removed, press headless straight pin (9) into

bracket (7) so that the headless straight pin pro-

trudes far enough into the cross-level (6) hole to

engage cross-level (6).

15 Position cover (8) into bracket (7) and slide cross-

Ievel (6) into position so the slot in the end of the

cross-level (6) engages headless straight pin (9).

16 Install cell (5) and secure with threaded ring (4),

using fabricated eccentric tool. Do not tighten

threaded ring (4) at this time.

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e. Installation

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NOTE

Position contact wires in the grooves of the

level assembly. Check to ensure wires are not

pinched between the M145/M145A1 telescope

mount and level assembly during installation.

1 If removed, install two headless straight pins (3).

2 Mount level assembly(1) and secure with two cap

screws (2).

3 Level gun tube (TM 9-2350-311–10 or

TM 9-2350-314-10).

f. Adjustment

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2

3

4

5

1

Loosen threaded rings (4 and 17) using fabricated

eccentric tool.

Place 1/2- by 3/4-by 6-inch parallel baron bear-

ing plate in telescope socket (35) so that it is at

right angle to main shaft (36).

Place zeroed M1A1 gunner’s quadrant (37) on par-

allel bar.

Adjust pitch knob until gunner’s quadrant (37) level

(38) bubble is centered.

Apply sealing compound (item 15, appx B) to

threaded ring (17) and install threaded ring into

bracket (7).

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