Piper COMANCHE PA-24-180 Service Manual page 639

PIPER COMANCHE SERVICE MANUAL
TABLE IX-VII. TROUBLESHOOTING (cent)
Cause
Trouble
Generator operating
within rated speed
range but voltage
output low. (cont)
Loose or high-resistance
electrical connections.
Clean and tighten all
electrical connections.
Brushes excessively worn.
When brush wears down to
1/2 inch, replace with
a new one.
CAUTION
Do not use abrasives
of any description in
seating the brushes.
Brushes binding in the
brush boxes.
Excessive side play of
brushes in brush boxes.
Brushes not properly
seated.
Low brush spring tension.
Dirty commutator.
Scored or pitted com-
mutator.
The brushes should be a free
fit without excessive side
play in the brush boxes.
Binding brushes and the
brush boxes should be
wiped clean with a cloth
moistened in
Varsol or
undoped gasoline.
Replace the brushes as
outlined above.
Reseat brushes as outlined
above.
Brush spring should bear
centrally on the top of
the brushes, insuring full
brush contact with the
face of the commutators.
Clean the commutator with
a cloth moistened in
Varsol or undoped gaso-
line.
Turn down commutator or
replace armature.
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3 E24