Disassembly and Reassembly of Fractional Megahertz Select Switch S4.

TM 11-6625-601-34

megahertz drive motor (46) from the frequency

proper terminal on the switch assembly (1-16).

counter (28).

b. Disassembly and Reassembly of Fractional

Megahertz Select Switch S4.

(j) Remove the spiral pin (47) that secures

the drive gear (48) to the drive shaft of the frac-

(1) Disassemble fractional megahertz select

tional megahertz drive motor (46). Slide the

switch S4 (fig. 32) as follows:

drive gear (48) off the shaft.

(a) Tag and unsolder all wires connected

(k) Remove the hexagonal nut (51) that

to fractional megahertz select switch S4 (17-19).

secures the right idler gear (54) to the right idler

(b) Remove the two machine screws (17)

shaft (55).

and switch spacers (19) that secure the wafer

(l) Slide the flat washer (52), the right

switch (18) to the frequency counter (28).

idler gear bearing (53), the right idler gear (54),

(c) Slide the wafer switch (18) off the

and the right idler shaft (55) off the mounting

switch shaft (part of frequency counter (28)).

screw (50). Remove the mounting screw (50)

(2) Reassemble fractional megahertz select

from the frequency counter (28).

switch S4 as follows:

(a) Slide the wafer switch (18) onto the

(m) Remove the hexagonal nut (57) that

secures the left idler gear (60) to the left idler

switch shaft (part of frequency counter (28)).

(b) Secure the wafer switch (18) in place

shaft (61).

(n) Slide the flat washer (58), the left idler

w i t h two machine screws (17) and switch

spacers (19).

gear bearing (59), the left idler gear (60), and

the left idler shaft (61) off the mounting screw

c. Disassembly and Reassembly of Frequency

(56). Remove the mounting screw (56) from the

Counter.

frequency counter (28).

(1) Disassemble the frequency counter (fig.

(o) Remove the two machine screws (62

3-2) as follows:

and 65) and lockwashers (63 and 66) that secure

(a) Tag and disconnect all wires con-

nected to the frequency counter (this includes

the standoff terminals (64 and 67) to the fre-

wires connected to switches S4 and S5).

quency counter (28). Remove the two standoff

(b) Remove the two incandescent lamps

terminals (64 and 67).

(27) from the front panel (68).

(2) Reassemble the frequency counter (28)

(c) Remove the four screws (24), lock-

as follows:

washers (26), and hexagonal nuts (25) that sec-

(a) Install the two standoff terminals (64

ure the frequency counter (28) to the front panel

and 67) on the frequency counter (28) and secure

(68).

w i t h the two lockwashers (63 and 66) and

(d) C a r e f u l l y r e m o v e t h e f r e q u e n c y

machine screws (62 and 65).

counter (28) and counter spacer (29) from the

(b) Install the mounting screw (56) in its

front panel (68).

proper hole on the left side of the frequency

(e) Remove the two machine screws (30),

counter (28).

(c) Slide the left idler shaft (61), the left

lockwashers (31 and 33), and hexagonal nuts (32)

that secure the left gear cover (34) to the fre-

idler gear (60), the left idler gear bearing (59),

quency counter (28).

and flat washer (58) onto the mounting screw

(f) Remove the two machine screws (36)

(56) and secure with the hexagonal nut (57).

and lockwashers (37) that secure the megahertz

(d) Install the mounting screw (50) in its

drive motor (35) to the frequency counter (28).

proper hole on the right side of the frequency

Carefully remove the megahertz drive motor

counter (28).

(35) from the frequency counter (28).

(e) Slide the right idler shaft (55), the

(g) Remove the spiral pin (38) that sec-

right idler gear (54), the right idler gear bearing

ures the drive gear (39) to the drive shaft of the

(53), and flat washer (52) onto the mounting

megahertz drive motor (35). Slide the drive gear

screw (50) and secure with the hexagonal nut

(39) off the drive shaft.

(51).

(h) Remove the two machine screws (40),

(f) Slide the drive gear (48) onto the drive

lockwashers (41 and 43), and hexagonal nuts (42)

shaft of the fractional megahertz drive motor

that secure the right gear cover (49) to the fre-

(46) and secure with the spiral pin (47).

quency counter (28).

(i) Remove the two machine screws (44)

(g) Place the fractional megahertz drive

and lockwashers (45) that secure the fractional

motor (46) in its proper position on the right side

megahertz drive motor (46) to the frequency

of the frequency counter (28) and secure with

counter (28). Carefully remove the fractional

two machine screws (44) and lockwashers (45).

3-5