Brushes; Armature - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEAIN SERVICE MANUAL
TABLE XI-V. TROUBLESHOOTING CHART (ELECTRICAL SYSTEM) (cont.)
Trouble
Cause
Remedy
Low motor and
cranking speed.
(cont.)
Excessive arcing
of motor brushes.
Same electrical
causes listed under
"Motor fails to
operate."
Binding, worn, or
improperly seated
brush or brushes,
with excessive side
play.
Same remedies listed
for these troubles.
See information above
dealing with this trouble.
Dirty, rough, pitted
or scored commutator.
Grounded or open
field circuit.
Clean as outlined above.
Test and replace defec-
tive parts.
Excessive wear and
arcing of motor
brushes.
Rough or scored com-
mutator.
Remove and turn commutator
down on a lathe.
Armature assembly not
concentric.
Reface commutator.
BATTERY 24 V
Battery will not
hold charge.
Battery worn out.
Replace battery.
Charging rate not set
right.
Reset.
Discharge too great
to replace.
Standing too long.
Equipment left "ON"
accidentally.
Impurities in
electrolyte.
Reduce use of starter on
the ground; use external
power wherever possible.
Remove and recharge
battery if left in unused
airplane one week or more.
Remove and recharge.
(See Paragraph 11-51.)
Replace battery.
ELECTRICAL SYSTEM
Revised: 10/5/83
3E13