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Figure 99. Frequency selector, right-side view.
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Figure 100. Frequency selector, rear view.


e. First If. Amplifier Subunit Lubrica-
tion (fig. 109). Remove the first if. ampli-
f i e r subunit (para 109). Lubricate the
mechanical parts listed in the chart below.
Apply only one or two drops of oil to the
cam surfaces and shaft bearings. Apply
one drop of oil to the tuning table guides.
g. Frequency Selector Lubrication.
Complete frequency selector lubrication
procedures are included in the reassembly
instructions (para 126). The following gen-
eral lubrication instructions apply to me-
chanical parts that can be easily reached
without disassembly of the frequency se-
lector. Lubricate the parts indicated in the
chart below after every 1,000 hours of
operation unless the frequency selector
has already been completely disassembled
a n d reassembled during that period of
f. 3.0- to 3.9-Mc If. Subunit Lubrication
(fig. 110). Remove the 3.0- to 3.9-mc if.
time.
Caution: Do not permit grease or oil to
subunit as described in paragraph 110 and
get into the automatic positioner clutch
lubricate the mechanical parts listed in the
assemblies. Oil or grease on the clutch
chart below. Apply one or two drops of oil
faces will cause malfunction of the fre-
t o the cam surface. Apply a minimum
quency selector.
a m o u n t of oil to the shaft bearings.
ac case blower after every 1,000
h. Dynamotor, Centrifugal Fan HD-390/
hours of operation. When any of
U, and Case Blower Lubrication and Main-
these
subunits
are
operating
tenance (fig. 111).
noisily or vibrating excessively,
( 1 ) Check the Receiver-Transmitter
replace the sealed bearings on the
Group OA-2648/VRC-24 dynamo-
subunit. Figure 111 shows the gen-
tor and dc case blower or the Re-
e r a l location of one dynamotor
ceiver-Transmitter Group OA-
sealed bearing.
2649/TRC-68 centrifugal fan and
162


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