Rotor bearing maintenance
RESTRICTED
b. Direct-
ional
Gyro and
Cardan
(Cont'd)
Clean-
ing
Fig. 18
pg. S3
In no carer instance
dear no be couched by anythire.
wii! the balis of a
Wher one rotor
bearing
always oil
ine ciner rotor bear-
ing: if ore bearing needs oil so does the other!.
Check
the
log book
for running time of the
stabilizer
СУГО.
Weather conditions and mechan-
ical
operation of the gyro must be taken into con-
sideration. The maintenance man should not
attempt
to oil
these
bearings witha syringe until he is
expert
enough
to apply just
enough
pressure to
the
syringe
and only one
drop of
oil, with his eyes closed.
During operation all excess oil is thrown
off in a
This spray settles on the
commutator and brushes.
Oil on the brushes causes
them to soften and chip. Carbon dust and metal
from the
commutator settles into the bearings and
will cause serious damage to them.
To prevent
this, it is very important that the
commutator
brushes be thoroughly cleaned immediately
after oiling.
Replace
bearing caps. and
gyre for
approximately 10 minutes, then wipe off the ex-
cess oil that has been thrown out.
• 9.
Clean commutator, brushes and brush tubes.
PRECAUTIONS:
1.
Use correct amount and grade of oil.
2.
Do notapply oil while unit is moving.
3.
Do not touch the applicator to any-
thing, for dirt will be
transferred
to the oil, and
thence to
the bear-
ing. The applicator wiil also scratch
balls.
4.
Place oil direct!y on balls between
inner and outer races, where pos-
sible.
Run unit for 10 minutes.
6: Clean brushes and commutators.
Cleaning.
Gyro
must be stopped to clean.
•b. Before removing brushes,
scribe head of
brust plug and measure
the amount it extends
This will make
replacement of the
plug to the same position more exact.
so that on replacement
are in the same
position as before.
Use clean
white cloth moistened with car-
tet. or benzine (not alcohol) over the end
of a soft wood stick, for cleaning commutators.
49