Piper Lance II User Manual

11-7.
TESTING
ALTERNATOR
INTER-
NA
L FIELD
CIRCUIT
FOR A
GROUND.
To test
the alternator
internal
field
circuit
for
a short
circuit
to
ground,
proceed as
follows:
Remove
the ground
brush
and
using
a 110 volt
test lamp,
place one
test probe
to the
field
terminal
and
the
remaining
test
probe
to a machined
sur-
face
at one of
the alternator
end
shields.
(Refer
to
Figure
11-3.)
The
test
lamp
should
not
light.
Figure
11-3.
Testing
Field
Circuit
If
the test
lamplights,
carefully
observe
the
order
in which
the parts
were
installed
as you
remove
the insulated
brush
assembly.
Remove
the
three
through
bolts.
Then, separate
the
two end
shieldassemblies.
Touch
one of
the test
lamp probes
to
one of the
slip rings
and
the
remaining
test
probe
to the
rotor
shaft.
The
lamp
should
not light.
If
the
lamp
lights,
the rotor
assembly
is grounded
and
requires
replacement.
If the
test lamp
does
not light,
the
ground
condition
was
in the insulated
brush
assembly
and the
parts
were
either
assembled
wrong
or
damaged
and
short
circuiting
through
toground.
Inspect
the
brush holder
and
insulatedwasher.
Re-
placeif
damaged.
The
stack of
parts attaching
the insulated
brush
holder
assem-
bly to
the end
shield must
always
be installed
in
the proper
sequence
as
follows:
Insulated
brush
holder,
"FLD" terminal,
insulating
washer,
lockwasher
and
at-
taching
screw.
11-8.
INSPECTION.
Inspect
the
condition
of the
alternator
components
paying
special attention
to the
condition
of the slip
rings for
indications
of oil, being
burnt
or worn. Inspect
brushes
for signs
of sticking
in holder
or shield
and for
wear.
Inspect
the bearing
surface
of
the rotor
shaft
and the
roller
bearings
at
the rectifier
end.
Rotate the
rotor in the
drive end
shield to
feel for roughness
in the drive
end bearing.
Inspect
the grease
retainer,
if so equipped,
on
late
alternators.
Inspect
the rectifier
leads
especially
at connections
for a
good sol-
der joint,
also inspect
insulation.
Rectifier/stator
lead
must be pushed
down
in-
to the
slots that
are cast into
the end
shield and cemented
with
MoPar
Cement
#2299314.
11-9.
TESTING
RECTIFIERS
(POSITIVE).
(Refer to
Figure
11-4.)
Special
test
box tool C-3829
has
been developed
to test
the diode rectifiers
without
opening
Issued:
1/3/78
ELECTRICAL
SYSTEM
2F19
LANCE II SERVICE
MANUAL

Piper Lance II Specifications

General

Manufacturer	Piper Aircraft
Max Takeoff Weight	3, 600 lb (1, 633 kg)
Crew	1
Horsepower	300 hp
Seats	6
Length	27 ft 7 in (8.41 m)
Capacity	5 passengers