Gyro maintenance
RESTRICTED
b.
c.
d.
Polish mirror with optical paper, if
obtainable.
Keep
lens clean.
Keep
all working parts free of dust
and dirt.
2. Gyro
Oiling.
Oiling.
M-Series sights that do not have
the Norden
Automatic Erection System, remove the
bearing cap and check the gyro rotor bearing
for oil.
sight has the A.E.S.,
possible
check accurately the rotor
bearing
oil. Therefore check the running time of the sight
and stabilizer.
If they are nearly edual, then
stabilizer arro rotor bearing for oil. If
the stabilizer rotor bearing needs
oil, it is
to assume that the sight rotor bearing needs oil.
Do not overoil and never use more than l drop of
bombsight oil.
If one bearing is lubricated, always lubricate
the other bearing. If one
needs lubrication so
willthe
other.
On sights where the bearing cap is removed,
place one drop of heavy
bombsight oil
directly
upon the balls. Do not touch
the applicator to
the
bails.
When oiling the sight rotor bearing, if the
A.E.S. has not been removed, place the oil in the
tapered oil hole.
If gyro rotor bearings are oiled, always run
gyro for ten minutes
and then clean the commutat-
or, brushes
and brush
reason for this
is that during operation ali excess oil is thrown
off in a fine spray.
This spray settles on the
commutator and
brushes.
Oil plus carbon dust
makes
a very fine grinding compound which will
deeply groove the commutator and wear the brushes.
Oil will also cause the brushes to soften and chip.
B. The carbon dust from brushes and metal from
worn commutator will settle into the bearing and
serious damage
results.
Dart caras and always clean
commutator, brushes and brush
tubes after oiling.
2.
Check
the gudgeon bearings
for freedom of
action.
If the gyro does not move freely remove
A.
On
the
the
it
is
im-
for
check
safe
is
that
during
operation
all
is
thrown
C.
162