Piper Arrow IV Turbo Maintenance Manual page 677

Trouble
Motor fails to operate.
(cont)
Low motor and cranking
speed.
Excessive arcing of motor
brushes.
Excessive wear and arcing
of motor brushes.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
CHART 8001. TROUBLESHOOTING (STARTER) (cont)
Dirty commutator.
Shorted, grounded, or
open armature.
Grounded or open field
circuit.
Worn, rough, or improp-
erly lubricated motor or
starter gearing.
Same electrical causes as
listed under "Motor fails
to operate".
Binding, worn, or im-
properly seated brush or
brushes with excessive
side play.
Dirty commutator, rough,
pitted, or scored.
Rough or scored commu-
tator.
Armature assembly not
concentric.
Cause
3G14
Remedy
If commutator is rough or
dirty, smooth and polish
with number 0000 sand-
paper. If too rough and
pitted, remove and turn
down. Blow out all parti-
cles.
Remove and replace with
an armature known to be
in good condition.
Test, repair if possible or
replace with a new part.
Disassemble, clean, in-
spect, and relubricate,
replacing ball bearings
if worn.
Same remedies listed for
these troubles.
See information above deal
ing with this trouble.
Clean as outlined above.
Remove and turn commu-
tator down on a lathe.
Reface commutator.
80-00-02
Page 80-03
December 1, 1978