Piper SARATOGA PA-32-301 Maintenance Manual page 179

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
Figure 24-7. Testing Rotor for Ground
Figure 24-8. Testing Rotor for Shorts
6. To remove the drive end head from the rotor shaft, use a puller that grips on the bearing retainer plate
as shown in Figure 24-5. Do not attempt to remove by supporting the end head and pressing on the shaft, as
this may result in distortion of the end head or stripping of the retainer plate screws. Remove the three retainer
plate screws and press the bearing out of the end head. (Refer to Figure 24-6.)
INSPECTION AND TESTING OF COMPONENTS.
Upon completion of the disassembly, all parts should be cleaned and visually inspected for cracks, wear or
distortion and any signs of overheating or mechanical interference.
1. Rotor: The rotor should be tested for grounded or shorted windings. The ground test can be made
with test probes, connected in series with a 110-volt test lamp, an ohmmeter or any type of continuity tester.
(Refer to Figure 24-7.) There must not be any continuity between the slip rings and the rotor shaft or poles. To
test for shorted turns in the rotor winding, connect a voltmeter, ammeter and rheostat as shown in Figure 24-8.
or use an ohmmeter. Rotor current draw and resistance are listed in the Alternator Service Test Specifications
paragraph. Excessive current draw or a low ohmmeter reading indicates shorted windings. No current draw or
an infinite ohmmeter reading would indicate an open winding.
EFFECTIVITY: PRESTOLITE
24-31-06
Page 24-14
Revised: August 23, 1982
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