Selector Mechanism Reassembly Procedure

o. Remove spring (83) and sleeve (84)

that point in the procedure in which the

from mask assembly (53).

defective part is replaced.

p. Remove retaining ring (79) that se-

Caution: Before inserting a taper pin

cures arm assembly (78) to shaft assem-

through a gear and a shaft, be sure that

bly (57). Remove arm assembly (78).

the taper pin holes are aligned correctly.

q. Remove spring (56) from arm assem-

Failure to observe this procedure will

bly (78) .

cause serious damage to the parts.

r. Remove thrust washer (70) from shaft

Note: Make all pinning operations with the dials

set at 30.00 mc. Setscrews (8), (15), (47), and (66)

assembly (69). Remove taper pin (68) from

are not supplied with the selector mechanism, but

gear (67); then remove O-rings (65) and

are used to secure replacement parts to gear shafts

gear (67) from shaft assembly (69).

while drilling. After the pinning operations are

completed, remove the setscrewe. Setscrews (43)

Note: Setscrew (66) is not supplied with the se-

and (64) are supplied with the selector mechanism

lector mechanism, but it is used to secure gear

and are to be replaced in coupler assemblies (44)

(67) to shaft assembly (69) during drilling of re-

and (63).

placement parts (para 96).

a. When replacing the bushing (2 3), apply

s. Remove taper pin (42) and setscrew

locktite (American Sealants, Grade C, or

(43) that secure coupler assembly (44) and

equal) to the outside shank of the bushing

remove coupler assembly (44).

(23) and press it into the housing assembly

t. Remove retaining ring (41) that se-

(59).

cures antibacklash gear assembly (36) to

b. If replacement is required, replace

housing assembly (59) and remove anti-

yoke (40), worm (21), screw (39), and gear

backlash gear assembly (36) and thrust

(20) at one time. Install thrust washer (22)

washer (37).

into housing assembly (59). Insert gear

Note: Do not disassemble the anti backlash gear

(20) and worm (21) into housing assembly

assembly (36) further.

(59) with yoke (40) positioned through

u. Remove retaining ring (71) that se-

housing assembly (59). Place thrust

cures gear arm (72) and spur gear (73)

washer (19) over gear (20), and secure in

to stud (74). Remove gear arm (72), spur

place with plate (11), lockwasher (10), and

gear (73), and thrust washer (77).

screw (9).

v. Remove taper pin (62) and setscrew

Note: After gear (20) and worm (21 ) are secured

(64) that secure coupler assembly (63) to

in housing assembly (59), yoke (40) extension

shaft assembly (75) and remove coupler

should be 0.462 inch 0.015. Measure this distance

assembly (63).

from the centerline of the outer drill hole in the

yoke (40) to the casting of the housing assembly

w. Remove retaining ring (61) from shaft

(59).

assembly (75). Remove shaft assembly (75)

c. Place thrust washer (70) on shaft as-

and thrust washer (76) from housing as-

sembly (69), insert shaft assembly (69)

sembly (59).

through housing assembly (59) and secure

x. Remove screw (9), lockwasher (10),

in place with retaining ring (46). Install

and plate (11) that secure thrust washer

arm assembly (49) on shaft assembly (69)

(19), gear (20), worm (21), and thrust

and secure taper pin (48).

washer (22) to housing assembly (59).

d. Apply locktite (American Sealants,

Note. Do not disassemble screw (39), yoke (40),

Grade C, or equivalent) to threads of ball

and worm (21).

plunger (38). Install ball plunger (38) into

y. Remove screw (28), lockwasher (27),

housing assembly (59); bottom the ball

flatwasher (26), and remove housing (25)

plunger (38) against cam (80) on shaft as-

from housing assembly (59). Remove lamp

sembly (69) and then back off ball plunger

(24) from housing (25). If bushing (23) is

one-eighth to one-quarter turn.

damaged, press it from housing assembly

Note: Before meshing the anti backlash gear as-

(59).

sembly (36) with another gear, advance the anti-

backlash floating gear two teeth, then mesh.

96. Selector Mechanism Reassembly

e. Place thrust washer (76) on shaft as-

Procedure

sembly (75). Insert shaft assembly (75)

(fig. 78)

through housing assembly (59) and secure

with retaining ring (61). Position coupler

In reassembling the gear train, start at

146