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TM 11-5820-509-35
against their stops and rotate scales (3) and (22) using
knobs (1) and (21) respectively so that the index marks
NOTE
are at 0; then tighten setscrews (2) and (20).
Stub shaft (35), in addition to being
pressed into the front panel of the
NOTE
receiver-transmitter, is secured in
Repeat step (29) until both controls
place by 6-32x 5/16 flat head screw
are set at 0 when the inductors are
(10) that is accessible by removing
against their respective stops.
the front panel unit nameplate.
(30) Insert LOCK knob (15), with washer (16)
(6) Bevel gear assemblies (24) and (65) are
attached, into the hole in dial stop (14) and screw the
removable by withdrawing either shaft out of the rear of
knob into place on stud (18). Then install E-ring (17) in
the panel until it is removed from panel bearing (23) or
the groove of the LOCK knob shaft.
(66). Do not remove retaining rings (89) or (64) unless
these bearings are defective.
3-16. Frequency Selection Mechanism
CAUTION
Do not attempt to disassemble gear-
shaft assemblies that are pinned
a. Disassembly Procedures.
together.  If either the gear or the
shaft is defective, replace the entire
NOTE
assembly as a unit.
Disassemble the frequency selection
mechanism  only  to  the  extent
necessary to accomplish repair or
(7) Loosen and remove 6-32 x 1/2 flat head
maintenance. Before beginning, set
screws (7),18), (9), (11), and (12) to remove sleeve nuts
the KILOCYCLES indicator on the
(25), (39), (42), 175) and (100).
front of the receiver-transmitter to
2000.
NOTE
Sleeve nuts (42) and (100) have
shoulders provided to index the
(1) Remove Signal Data Translator CV-
mounting holes in gear plate (103)
1377A/PRC-47  (A3)  and  Oscillator  Control  C.
for alignment.
4311/PRC-47 (A7) from their locations in the RT.
671/PRC-47 using the procedures of paragraph 3-126
(2) Loosen setscrews 12), (4), and (6), two
(8) Remove panel bearings (23), (66), and
per knob, and remove frequency control knobs (1),(3),
(79) only if they are defective. Whenever any one of
and (5) from their shafts.
these panel bearings is replaced, replace gasket (221
(67), and/or (80) with it.
(3) Loosen and remove 6-32 x 3/8 pan head
screws (102), (108),(119),(134), and (137) and washers
(9) The spur gear-pinion assembly consisting
(101), (107), (118), (132),1133), and (136) that attach
of gear (72), shaft collar (70), bearing (68), and
the gear plate (103) to sleeve nuts (25),(39),(42), (75),
gearshaft (127) is removed by pressing the pinion end of
and (100).
the shaft through the gear plate. Further disassembly of
this spur gear-pinion assembly is performed as follows:
NOTE
(a) Remove washer (73) from the end
Before proceeding, dress the cable
of the shaft.
away from the back of the gear plate
(b) Loosen setscrews (71) in shaft
as far as possible so that the gear
collar (70) and withdraw spur gear (72) from the shaft.
plate can be withdrawn sufficiently to
(c) Remove shaft collar (70) from the
disengage  the  center  frequency-
shaft and release C-ring (69).
control shaft (78).
(d) Remove panel bearing (68) from
the pinion shaft.
(4) Carefully withdraw gear plate (103) from
the shoulders of sleeve nuts no. 2 (42) and (100) to
NOTE
provide access to all gears and gearshaft assemblies.
If either the pinion or its gearshaft
(127) is defective, replace the pinion-
NOTE
gearshaft assembly as a unit.
When withdrawing the gear plate, do
not lose flat washer (27); it may
(10) Remove  the  center  frequency-control
adhere to sleeve bearing (26). Place
gearshaft assembly (78) as follows:
this washer on spur gearshaft (28)
(a) Release pawl spring (111) from eye
for future installation.
(b) Remove E-ring (124) from stub
shaft (122) and rotate gear and stop assembly (123)
(5) Remove idler gears (18), (29), (37), and
until it can be removed from the stub shaft.
(43) only if the gear or its stub shaft 114),(15), (17), or
(c) Remove setscrew (126) from gear
135) is defective.  Remove E-ring (19) (30), (38), or
and
144) to remove the defective idle; gear.
3-107


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