Piper COMANCHE PA-24-180 Service Manual page 560

PIPER COMANCHE SERVICE MANUAL
To install
new bruhes, remove the
brush holder assembly from the end frame by
detaching
the two brush holder assembly
scrws.
Install the springs nd brushes into
the bruh holder,
nd insert a straight wire or
pin into the holes a the bottom of the holder to
rtain the bushes
(Figue 9-21) Then attach
the brush holder assembly onto the end frme,
noting carefully the proper stack-up of parts a
shown in Figure 921. Allow the straight wire
to protrude through the hole in the end frame.
HOU FOR PIN
9-54. Het Sink Replaceeet. The heat sink
FIGURE 9.21. BRUSH HOLDER ASSEMBLY
may be replaced by removing the "BAT" and
"GRD" terminal from the end frame, and the screw attaching the condenser lead to the heat sink.
During reassembly, note carefully the proper stack-up of parts as shown in Figure 9.22.
9-55. Reassembly. Reassembly is the reverse of disassembly. Remember when assembling the
pulley to secure the rotor in a vise only tight enough to permit tightening the shaft nut to 50-60 ft.
Ibs. If excessive
pressure is applied against the rotor, the assembly may become distorted.
To install the slip ring end frame assembly to the rotor and drive end frame assembly, remove the
tape over the bearing and shaft, and make sure the shaft is perfectly clean after removing the
tape.
Insert a straight wire a previously mentioned through the holes in the brush holder and
end frame to retain the brushes in the holder. Then withdraw the wire after the alternator has
been completely assembled. The brushes will then drop onto the slip rings.
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FIGURE 9-22. EXPLODED VIEW OF HEAT SINK ASSEMBLY
ELECTRICAL SYSTEM
ISSUED: 8/18/72
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3 B14