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 290 of 590

TM 9-1240-401-34&P

5.1-21. BASE MAINTENANCE INSTRUCTIONS - continued

c. Assembly

NOTE

1

2

3

4

5

6

7

8

9

There are no repair parts for the differential

assembly. Illustration is for assembly only.

Apply grease (item 6, appx B) to teeth of spur gears

(1 and 2).

Install spur gears (1 and 2) in slot of shouldered

shaft (3) with hub extensions in opposite directions.

Apply grease (item 6, appx B) to two shafts (4) and

install to secure spur gears (1 and 2) in shouldered

shaft (3).

Apply grease (item 6, appx B) to teeth and inner wall

of cluster gears (5 and 6) and install over spur gears

(1 and 2).

Check differential assembly by rotating either cluster

gear while holding shouldered shaft still. The other

cluster gear should turn in the opposite direction,

and there should be no binding or noticeable

backlash. Test for backlash by grasping either

cluster gear and the shaft end and attempting to turn

the other cluster gear.

Apply grease (item 6, appx B) to both ends of

differential assembly (7). Install long end of shaft

through bracket (8).

Install short end of shaft into

base bushing, and slide bracket (8) into position on

base (9).

Aline bracket holes with two straight pins (10), and

tap straight pins through base until flush with rear

surface.

Install two new lockwashers (11) and two screws

(12).

Install spur gear (13) on shaft of differential

assembly (7) and secure with tapered pin (14).

5.1-56

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