Alternator Overhaul; Alternator Disassembly - Piper PA-24 Comanche Service Manual

•
•
PIPER COMANCHE SERVICE MANUAL
e. Do not short across or ground any of the terminals on the alternator or regulator.
f. Do not attempt to polarize the alternator.
g. External power should not be connected to or removed from aircraft with master switch on.
9-61e. Overhaul of Alternator. When repairing the alternator. complete disassembly may not be required. In
some cases it will only be necessary to perform those operations which are required to effect the repair. How-
ever in this section. the complete overhaul is covered step-by-step to provide detailed information on each
operation. In actual service practice, these operations may be used as required.
' - 6
If.
Disassembly of Alternator.
a. Remove the two Number 10-24screws holding the brush holder assembly in the slip ring end head.
Remove the brush and holder assembly from the end head.
b. Remove the safety wire from the through bolts. Hold the pulley with a strap wrench and remove the
pulley nut. The pulley must be removed with a puller. Remove the fan. woodruff key and spacerfrom the shaft.
c. Remove the four through bolts and tap the drive end head lightly to separate the drive end head and
rotor as a unit. from the stator and slip ring end head.
d. Remove the nuts. lock washers. flat washers and insulators from the output and auxiliary terminal
studs. Note carefully the correct assembly of the insulator washers and bushngs. Using the special tools shown
in Figure 9-27c. support the end head and press out the three negative rectifiers. The end head can now be
separated from the stator assembly.
e. To remove the slip ring end bearing and grease seal, it will be necessary to have a hook type or
impact type bearing pulley as shown in Figure 9-27d. Do not remove the bearing unless replacement is
necessary.
•
.-
Figure 9-27c. Removal of Rectifier
Figure 9-27d. Removal of Slip Ring End Bearing
3B23
ELECTRICAL SYSTEM
ISSUED: 8/18/72