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 272 of 590

TM 9-1240-401-34&P

5.1-19. M15 QUADRANT MAINTENANCE INSTRUCTIONS - continued

a. Disassembly - continued

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Remove plug (42), spring (43), and plunger (44).

Loosen two setscrews (45) in nut (46).

Using tubular spanner wrench 1-1/16 inch and 1-

5/64 inch, remove nut (46) and flat washer (47) from

shouldered shaft (48).

Remove gear sector (49) and flat washer (50) from

shouldered shaft (48).

Remove two machine screws (51) from gear sector

(49).

Loosen setscrew (52) in shouldered shaft (48);

unsolder wire of electrical lead (53) from toggle

switch (54) and remove electrical lead (53).

Remove three screws (55), three lockwashers (56),

and shouldered shaft (48), only if necessary for

replacement. If removed, discard lockwashers.

Remove pin (57), only if necessary for replacement,

Using adjustable spanner wrench, remove ring (58)

from M15 quadrant.

Remove preformed packing (59) from ring (58).

Discard preformed packing.

Remove ball socket seat (60) from M15 quadrant.

Remove tapered pin (61) securing spur gear (62) to

shouldered shaft assembly (63).

Remove tapered pin (64) from worm gear (65).

Remove worm gear (65) and spur gear (62) from

shouldered shaft assembly (63).

Remove shouldered shaft assembly (63) and ball

socket seat (66) from M15 quadrant.

5.1-38

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