Raytheon Beech Baron E55 - Page 623

Ral~heon
nircraft
Company
BARON
55
AND 58
SHOP MANUAL
PTT
N.
O.
~7
PURE
DC
REGULATED
SUPPLY
5A
28
V
RELAY
i.
ON
INDICATOR
INDICATOR
i-CONTACTOR
INDICATOR
5
DEVICE
28V
55-3516
Overvoltage
Protection
Function
Test
Figure
5
GENERA
TOR
AND
AL
TERNA
TOR
EEL
T
ADJUSTMENT
Test
the
belt
tension
by
pushing
down
on
the belt
at
a
point
midway
between
the
pulleys.
A deflection
of
3/8
in.
when
a
pressure
of
12
Ibs
is
applied
indicates
correct
tension
on a
new
belt.
This
same
deflection
indicates
proper
tension
upon
the
application
of
10
Ibs
against
a
used
or
readjusted
belt.
If
the
belt
is
too
loose,
tighten
the
belt
by
shifting
the
generator
or
alternator
on
its
pivot.
On
airplanes
equipped
with belt
driven
alternators,
determine
that the
hex
fitting
at
the
engine
fuel
pump
inlet
connection
is
positioned
such
that
the
hex
flat
is
parallel
with
the
alternator drive face
belt,
thereby
providing
a
minimum of
0.25
in,
clearance
between the
two.
AL
TERNA
TOR
LUBRICA
TION
(BEL
T
DRIVEN)
Lubricate
the
bearing
in the drive and frame
to
one-quarter
full
(do
not
overfill,
as
this
may
cause
the
bearing
to
overheat)
with
Delco-Remy
lubricant
No. 1960373
only.
It is
recommended
that
a
new
retainer
plate
be
installed
if
the
felt
seal
in
the
retainer
plate
is
hardened
or
excessively
worn.
The
bearing
in the
slip ring
end
frame
should be
replaced
if
its
grease
supply
is
exhausted.
No
attempt
should
be
made
to
relubricate and
reuse
the
bearing.
OVERVOL
TAGE
RELA
YS
No
attempt
should
be made
to
adjust
the
overvoltage
relays.
They
are
preset
at
the
factory
to
trip
at
a
voltage
of
32
~1
vdc.
When
the
relay
is determined
defective,
it should
be
replaced
with
a
new
or
exchange
relay.
ALTERNATOR
TROUBLESHOOTING
I
Refer
to Chart
32
TROUBLESHOOTING
ALTERNATOR
SYSTEM.
E21
SECTION
13
Dec
31/03Page
25