Low Motor And Cranking Speed; Excessive Arcing Of Motor Brushes; Excessive Wear And Arcing Of Motor Brushes - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 8001. TROUBLESHOTTING (STARTER) (cont)
Trouble
Starter fails to operate. (cont)
Low motor and cranking
speed.
Excessive arcing of motor
brushes.
Excessive wear and arcing
of motor brushes.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Dirty commutator.
Shorted, grounded, or open
armature.
Grounded or open field
circuit.
Worn, rough, or improperly
Iubricated motor or starter
gearing.
Same electrical causes as
listed under "Motor fails
to operate."
Binding, worn, or improperly
seated brush or brushes
with excessive side play.
Dirty commutator, rough
pitted or scored.
Rough or scored commutator.
Armature assembly not
concentric.
3I15
Remedy
If commutator is rough or
dirty, smooth and polish with
number 000 sandpaper. If too
rough and pitted, remove and
turn down. Blow out all
particles.
Remove and replace with an
armature known to be in
good condition.
Test, repair if possible or
replace with a new part.
Disassemble, clean, inspect,
and relubricate, replacing
ball bearings if worn.
Same remedies listed for
these troubles.
See information above
dealing with this trouble.
Clean as outlined above.
Remove and turn commutator
down on a lathe.
Reface commutator.
Revised: May 15, 1989
8 0 - 0 0 - 0 2
Page 80-03