Piper Comanche PA-24 Service Manual page 775

•
Trouble
:\lotor fails to operate.
(conI)
Low motor and cranking
spe-ed
Excessive arcing of
motor brushes
Excessi\'e wear and
arcing of motor
brushes
ELECTRICAL SYSTEM
ISSUED: il/18/n
PIPER COMANCHE SERVICE MANUAL
TABLE IX-VII. TROUBLESHOOTING
(cant)
Cause
Remedy
Grounded or open field
Test, repair if possible or
circuit. replace with a new part.
Worn, rough, or improperly Disassemble, clean, inspect.
lubricated motor or and relubricate. replacing
stnter gearing. ball bearings if worn
Same electrical causes as Same remedies listed for
listed under "Motor these troubles.
fails to operate".
Binding, worn, or improperly
See information abo\'e dealing
I
seated brush or brushes WIth this trouhle
with
excessive
side play
Dirty commutator, rough, Clean as
Ql!.'
.,ted above.
pitted, or scored.
Rough or scored com-
Remove and turn com!Tlutator
i
mutator down on a lathe
i
I
Armature asse-mbly not Reface commutator
,
I
concentric
I
3
F4