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|  dry, lint-free cloth before applying new
(d) Tighten clamps 01237 (4) through
lubricant. Apply oil with a thin brush. Ro-
01237 (8) (fig. 100).
tate movable parts to apply lubricant to the
(8) Reassembly check. After reas-
entire contact surface.
sembly and synchronization of the
frequency selector, refer to para-
Caution: Do not mix natural-base lubri-
cants such as MIL-L-7870 and MIL-G-
selector checking procedures.
7421 with synthetic lubricants such as
MIL-L-6085 and MIL-G-3278. Mixing a
127. Lubrication
natural and a synthetic oil or grease often
a. General. Lubricate the subunit me-
destroys the lubricating properties of both
chanical and electrical parts listed in the
following charts after every 1,000 hours of
b. Lubricant Chart. The chart below
operation. If the radio set is operated 8
lists the nomenclature and federal stock
hours a day, the 1,000-hour interval is ap-
number and common name of the lubri-
proximately equal to 4 months operation.
cants used for this radio set. Only the
When a subunit is removed for repair, lu-
common name will be listed in the lubri-
bricate the parts as indicated before re-
cation charts.
placing the subunit. Clean the parts with a
Lubricant
Specificiation
Federal stock No.
name
Common
Grease, Aircraft and Instruments
Grease
9150-190-0883
MIL-G-7421
Oil (OAI)
Lubricating oil, instrument (OAI)
MIL-L-6085
9150-223-4129
Oil (OGP)
Lubricating Oil, General Purpose
MIL-L-7870
9150-273-2398
Aircraft, Low-Temperature
(OGP)
Light-consistency grease
Grease, Aircraft and Instruments
9150-272-3370
Low-temperature grease
Grease, General Purpose, Low-
9150-291-9088
Temperature
Pressure grease
Grease, Ordnance, Extreme
9150-209-8014
Pressure
c. Rf and Power Amplifier Subunit Lu-
Interval
Part
Lubricant
power amplifier subunit (para 107). Re-
Induction ring as-
Oil (OAI)
move the cover plates from the bottom of
semblies, both
the subunit and lubricate the mechanical
sides of each
assembly
and electrical parts listed in the chart be-
Power amplifier
Oil (OAI)
low. Apply a thin film of grease to the shaft
rotor contact
surfaces, both
ends
parts requiring oil. Visible amounts of oil
Driver rotor con-
Oil (OAI)
on these parts is not desirable.
tact surfaces
Interval
Lubricant
Part
Front tuning shaft
Grease ( M I L -
Lubricate all
bearing
G-7421)
parts after
unit (para 108a). Remove the cover plate
1,000 hours of
from the first oscillator assembly (para
operation or
122a(2)) and remove the cover plate from
every 4 months.
Rear tuning shaft
Light consis-
the bottom of the frequency multiplier-
bearing
tency grease
amplifier tube chassis (para 124a(3)). Lu-
Power amplifier
Grease (MIL-
bricate the mechanical and electrical parts
rotor shaft
G-7421)
bearing
listed in the chart below. Apply a thin film
Oil (OAI)
Grounding finger
of grease to the shaft bearings. Apply three
contact surfaces
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