TM 11-5826-225-35
d. Replacement of Dial Drum.
the bearing located at the bottom and
center of frame (36).
(1) If the gear train is removed, replace
(15) Lower spur g-ear assembly (30) until
it (c above).
just one spur gear (32) is engaged
(2) Apply a small quantity of MIL-L-
with spur gear (43).
7870 oil to the inner surface of the
(16) As viewed from the top, rotate dial
bearings located at the top and bot-
drum (41) clockwise until the gear on
t o m , and in the center, of frame
spur gear assembly (30) rotates clock-
(136).
wise 11 teeth.
(3) P l a c e load spring (31) around the
(17) Lower spur gear assembly (30) until
shank of the gear on spur gear assem-
the gear on spur gear assembly (30).
bly (30) .
engages with spur gear (43).
(4) Slide spur gear (32) onto the shank of
(18) Loosen setscrew (78) on collar (77)
the gear on spur gear assembly (30).
and let dial drum lever (81) lower
(5) Place the ends of load spring (31) in
dial drum (41) to the bottom of frame
the retaining holes in spur gear (32)
(136).
and the gear on spur gear assembly
(19) Place the bottom of helical spring
(30).
(40) over the center post in the bot-
(6) Place retaining ring (33) in the slot
tom of dial drum (42).
around the shaft of spur gear assem-
(20) Insert the hooked end of helical spring
bly (30).
(40) into the hole in collar (37).
(7) Loosen two setscrews (78) on collar
(21) As viewed from the top, rotate collar
(77) to allow the lever of dial drum
(37) clockwise until one revolution
lever (81) to be pushed to the bottom
of tension is placed on helical spring
of frame (136).
(40).
(8) Insert the shaft of spur gear assem-
(22) Apply blue varnish to the threads of
bly (30) through the top of the bear-
two setscrews (35).
ing located at the top and center of
(23) Tighten two setscrews (35).
frame (136).
(24) If there are no other parts to be re-
(9) Place bearing sleeve (38) inside col-
placed, perform alignment procedures
lar (37) and slide them over the shaft
of spur gear assembly (30).
e. Replacement of Tuning Synchro (B301).
( l 0 ) Place -helical spring (40) around the
(1) If the dial drum is removed, replace
shaft of spur gear assembly (30).
it (d above).
(11) Insert the shaft of spur gear assem-
(2) U s e three screws (155) and three
bly (30) into dial drum (41), and set
lockwashers (154) to loosely secure
dial drum (41) on top of the lever of
three rim-clenching clamps (153) to
dial drum lever (81).
frame (136).
(3) Insert the shaft of transmitter syn-
(12) Rotate collar (77) until dial drum
chro (156) through the mounting hole
lever (81) raises dial drum (41) ap-
in frame (136), and secure transmit-
proximately inch from the top of
ter synchro (156) to frame (136) with
frame (136).
three rim-clenching clamps (153),
(13) Tighten one of the setscrews (78) on
(4) Place load spring (122) around the
collar (77).
shank of spur gear (123).
(14) Place washer (42) on the end of the
(5) Slide spur gear (121) over the shank
shaft on spur gear assembly (30),
of spur gear (123), and insert the
and insert the end of the shaft into
3-16
Previous Page
