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 152 of 590

TM 9-1240-401-34&P

4-20. COUNTER BOX ASSEMBLY MAINTENANCE INSTRUCTIONS - continued

d. Assembly - continued

8

9

10

Insert lamp base potion of overlay assembly (29)

into electrical lead (33). Position wire (30) in

recessed area to accommodate protective cap (28).

Apply adhesive to inside edge of protective cap (28).

Install protective cap (28) and secure with two

machine screws (27). Remove excess adhesive

from outer edge of protective cap (28).

e. Installation

1

Install eccentric stud (22) and setscrew (21).

2

Set the correction counter (41) and elevation

counter (42) to 0.

3

Apply sealing compound around keyways and slot

around eccentric stud (22), and install counter box

assembly (20) on M145/M145A1 telescope mount

using four flat washers (19), four new lockwashers

(18), and four nuts (17). Hand tighten four nuts (17).

4

Loosen setscrew (21) and rotate eccentric stud (22)

to obtain minimum backlash in the elevation

handwheel (43). Tighten setscrew (21).

5

Tighten four nuts (17).

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