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 286 of 590

TM 9-1240-401-34&P

5.1-20. COUNTER ASSEMBLY MAINTENANCE INSTRUCTIONS - continued

c. Assembly - continued

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Apply grease (item 6, appx B) in hole of boss on

base (A) and hole of bracket(B).

Slide spur gearshaft (10) through boss of base (A)

and slide retaining ring (11) on shaft of spur

gear-shaft (10), being careful to spread retaining ring

(11) only as far as necessary.

Position spur gear (12) so that teeth of spur gear

mesh with gear of differential assembly (8) and slide

shaft of spur gearshaft (10) through spur gear (12)

and into hole of bracket (B).

Secure spur gearshaft (10) in base (4) with retaining

ring (11).

Aline holes of spur gear (12) with hole in spur

gearshaft (10) and secure with tapered pin (13).

Apply grease (item 6, appx B) to spur gear (12) and

to teeth of spur gearshaft (10).

NOTE

If correction counter is to be replaced, perform

steps 21 thru 30. If existing counter is to be

reinstalled, go to step 31.

Slide spur gear (14) on shaft of rotating counter (15)

and temporarily install, but do not tighten a setscrew

in spur gear (14).

Remove two straight pins (16) from base (4).

Position rotating counter (15) on base (4) and install,

but do not tighten four screws (17) and four new

lockwashers (18).

Aline spur gear (14) with teeth of spur gearshaft (10)

and temporarily secure spur gear (14) to shaft of

rotating counter (15) with setscrew. Tighten four

screws (17).

Mark holes for two straight pins (16) by partially

drilling through existing holes in base (4).

5.1-52

Change 1