Piper Comanche PA-24 Service Manual page 700

FIGURE
9·270.
REMOYAL OF DRIVE
END HEAD
NOTE
PIPER COMANCHE SERVICE MANUAL
FIGURE 9-271. REMOY AL OF END
HEAD BEARING
The inner race of the Slip
ri~1
end bean",
lS
pressed
o~to
tbe
rotor shaft. When bea"", replace .. ent
is
necessary. always re-
place tbe complete bean",
use ..
bly. includinl the inner race.
f. To re:nove the drive end head fro .. the rotor shaft. use a pull., that IUPS on the be."n,
retainer plate as shown in Filure 9-27e. Do not atte .. pt to re!DOVe by suppOrt in, the end head
and press in, on the shaft. as this IDlY result in distortion of the end head or strippIng of the
retaiaer plate screws. Remove the
three retalDer
plate screws and press
the
bearing out of the
end head. (Refer to Fi&ure 9-271.)
9-61&. I •• poetlo. And T •• ti",
Of
Co,"po.ont •. Upon completion of the disassembly. all parts
should be cleaned and visuaUy inspected for cracks, well' or diston10n and any sIgns of over-
heatine. or mechanical interference.
a. Rotor: The rotor sbawd be tested for grounded or shorted "indines. The 1I'0Wld test can
be made with teat probes. COMected in .enes with aUG-volt te.t lamp. an oh ..... ter or any type
of continuity tester. (Refer to Figure 9-27g.) There ..... t not be any continuity between the slip
riap and the rotor shaft or poles. To test for sborted tums in the rotor wincilnl. connect a volt-
meter, ammeter and rheostat u showa in FilUre 9-2ib. or Wle an ohmmeter. Rotor current draw
and. resistance are listed i.n
the
utdividual specification pales. Excessive current draw or a low
ohmmeter reading indicates shorted windinp. No CUrrent draw or an la.finite ohmmeter reacl.ing
would il1dic:ate an open wirdinc.
b. RectlfierJ: A diode rectIfier tester will detect and pinpoint open or shorted rectifiers
without loinl throuah the operation of discoMectinl
tbe
stator leads. However, if a tester is not
available. telt probe. and • No.
S7
bulb. COMocted in series with. 12·volt battery. can be used
in
tbe
follo.ina manner. Touch one test probe to a rectifier heat sink ilnd
the
other test probe to
ELECTRICAL SYSTEM
ISSUED: 1111172
3824