Figure 24-33. Testing Rotor for Ground Figure 24-34. Testing Rotor for Shorts
6. To remove drive end head from rotor shaft, use a puller that grips on bearing retainer plate as shown in
figure 24-31. Do not attempt to remove by supporting end head and pressing on shaft, as this may
result in distortion of end head or stripping of retainer plate screws. Remove three retainer plate screws
and press bearing out of end head. (Refer to figure 24-32.)
INSPECTION AND TESTING OF COMPONENTS
Upon completion of disassembly, clean and visually inspect all parts for cracks, wear, or distortion, and
any signs of overheating or mechanical interference.
l. Rotor: Test rotor for grounded or shorted windings. Ground testing is made with test probes, connected
in series with a l10-volt test lamp, an ohmmeter or any type of continuity tester. (Refer to figure 24-
33.) There must not be any continuity between slip rings and rotor shaft or poles. Test for shorted turns
in rotor winding by connecting a voltmeter, ammeter, and rheostat as shown in figure 24-34, or use an
o h m m e t e r. Rotor current draw and resistance are listed in Alternator Service Test Specifications.
Excessive current draw or a low ohmmeter reading indicates shorted windings. No current draw or an
infinite ohmmeter reading indicate an open winding.
24 - 33 - 00
Page - 24 - 30
Reissued: August 1, 1986
1J5
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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