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 284 of 590

TM 9-1240-401-34&P

5.1-20. COUNTER ASSEMBLY MAINTENANCE INSTRUCTIONS - continued

b. Repair

1

Remove corrosion, grease, and dirt from all parts.

Refer to TM 9-254 for cleaning instructions.

2

Visually inspect for missing or damaged parts.

3

Repair or replace parts in accordance with

authorized parts listed in appendix D.

c. Assembly

NOTE

If elevation counter is to be replaced, perform

steps 1 thru 11. If existing counter is to be

reinstalled, go to step 12.

1

2

3

4

5

6

Install spur gear (1) on shaft of rotating counter (2)

and temporarily install, but do not tighten a number

4-48 UNF setscrew in spur gear (1).

Remove two straight pins (3) from base (4).

Position rotating counter (2) on base (4) and install,

but do not tighten four screws (5), four new

lockwashers (6), and four flat washers (7).

Position rotating counter (2) and spur gear (1) until

spur gear (1) meshes properly with gear of

differential assembly (8).

Tighten setscrew to secure spur gear (1) to shaft of

rotating counter (2) and tighten four screws (5).

Drill and ream rotating counter (2) for two straight

pins (3).

5.1-50 Change 1