Electrical fault checks
RESTRICTED
BEARINGS
STANDARD
CLEARANCES
AND NOTES
4.
heck between the gyro housing and the servo
brush.
ATTENTION checking any cive at 105
In checking any circuit for grounds it is
necessary
to remove all ground terminals
which are part of the one wire system, AND
CHECK FOR FAULTY WIRING AND CONNECTIONS.
A gudgeon bearing is
a short shaft bearing.
A
locked gudgeon bearing is locked by means
of a
flange an a
a spacer
inorder to control the direct
! on
expansion.
Expansion,
therefore,
takes
place in
a direction away
from
the locked
bearing.
The sight gyro and cardan,
when
cold, are un-
balanced with
1,1000th of their mass to the rear
and
right
respectively.
When the gyro warms up
the expansion is
away from the locked bearings,
the mass is again evenly distributed.
The Following
sight bearings are locked: rear
дУгО
gudgeon bearing and
right cardan
bearing. The
right cardan bearing
is locked to prevent changing
cable tension.
The following
bearings on the stabidizer gyro
are
locked:
gyro rotor bearing on the end oppos-
ite the commutator end and the gyro gudgeon bear=
ing
on the
isolated sector side.
when the
stabilizer gyro is cold
and dead, the
contact brush should ride upon the upper six
volt
segment o
the isolated sector. When hot, the cen-
ter of mass of ine
gyro moves toward the commutat-
or end and the brush
should now be on the neutral
! EVE:.
segmentione gyro cudgeon
providing that the stabilizer housing is
bearing next
to the
iated sector
locked so that expansion will not
change the
seating or tension of the brush
on the
isolated sector.
A. Replace
carbon brushes when one quarter inch
is worn off-compared with e new brush.
Replace
helescope motor brushes when
worn more than
the other, or they do not meet com-
mu*Etor at 800
Telescope motor rushes must be in line.
Never
cut pigtalis.
Fold back
one-half inch
of end of
pigtail
refold that in half. Pig-
cut to
exact length
the factory.
connections.
F. Motor brushes should
make 85% contact.
G.
Brush plugs on the bombsight extend one quart-
er inch. Brush
plugs on stabilizer extend 5/16.
of
The
iso-
B.
one
is
C.
D.
and
teiis
are
at
Use
solder
227