Piper Cherokee Six - Assembling End Shield Sub-Assemblies; Bench Run-Up Test

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
10-25.
ASSEMBLING
END
SHIELD
SUB-ASSEMBLIES.
Position
the
rotor
and
drive
end
shield
assembly
on
the
rectifier
end
shield.
Align
the
through
bolt
holes
through
the
drive
end
shield,
stator
and
the
rectifier
end
shield.
Compress
stator
and
both
end
shields
by
hand
and
install
the
through
bolts.
Install
the
insulated
brush
and
holder,
terminal,
insulating
washer,
lockwasher
and
terminal
attaching
screw.
Install
the
ground
brush
and
attaching
screw.
Rotate
the
pulley
slowly
by
hand
to
be
sure
that
the
rotor
fans
do
not
hit
the
rectifiers
and
stator
connectors.
After
installing
the
alternator
on
the
engine,
always
test
the
complete
charging
system
to
be
certain
it
is
functioning
properly.
NOTE
New
through
bolt
locking
tabs
should
be
installed
at
each
alternator
disassembly.
Torque
through
bolts
evenly
to
25
inch
pounds
and
bend
both
ears
of
the
locking
tabs
against
bolt
head.
Check
proper
belt
tension.
10-26.
BENCH
RUN-UP
TEST.
This
test
is
to
be
performed
at
room
ambient
conditions
and
consists
of
four
checks
which
are
to
be
made
quickly
to
avoid
heating
of
the
windings.
These
are
as
follows:
NOTE
For
test
c
and
d
external
field
excitation
may
be
used
but
must
be
removed
and
self
excitation
used
to
obtain
output
amperes.
(Refer
to
Figure
10-24
for
meter
connections.)
a.
With
the
alternator
at
rest,
apply
15
volts
between
the
alternator
battery
termina
and
ground
with
polarity
such
that
the
rectifiers
will
block
current
flow
(positive
of
supply
to
positive
of
the
alternator).
Monitor
rectifier
reverse
current
which
shall
be
not
more
than
I
milliampere.
b.
With
the
alternator
at
rest,
apply
15
volts
to
the
field
circuit
and
monitor
field
current.
This
shall
be
between
the
limits
of
3.3
amperes
minimum
and
3.6
amperes
maximum.
c.
Drive
the
alternator
at
1500
rpm
with
an
electrical
load
connected
to
the
alternator.
Adjust
the
load
to
obtain
15
volts.
Net
output
(not
including
field
current)
shall
be
not
less
than
26.5
amperes.
d.
Drive
the
alternator
at
2500
rpm
with
an
electrical
load
connected
to
the
alternator.
Adjust
the
load
to
obtain
15
volts.
Net
output
(not
including
field
current)
shall
be
not
less
than
49.0
amperes.
ELECTRICAL
SYSTEM
Issued:
8/17/72
3B14