Piper Comanche PA-24 Service Manual page 685

PIPER COMANCHE SERVICE MANUAL
a. When ill5talliDI a battery, always
."Ilul
absolutely sure the
ground polarity 01 the battery ... d
the
ground polarity 01 the alter-
aator are the lame.
b, When connectiDl a booster battery, make certeiD to canDect the
nelative battery terminals tapther and the positive battery ter-
minals toaether,
c, When cOMeclin1 a charier to the battery, cODDeet the charier
positive lead to the battery positive terminal aDd
the
char,er nel'"
tive lead to the battery negative terminal,
d, Never operate the alternator on open c:ircuit. Make abaalutely
certain all conaections
in
the circuit are secure.
e. Do not short across or
"owuI
""y of the terminals
OD
the alter-
aator or repletor.
L Do not attempt to palari:e the alternator.
9-46. Te.t And Maintenance Of Alternatar. (O.lc .. ".,
.y)
9-47. In.pectlon. Even though the alternator is consttucted to give lon& periods 01 trouble-lree
service, a regular
inSpeetiOD
procedure should be followed to obtain. the maximum life from the
altemator.
The frequency 01 inspection
is
determined laraely by the type 01 operatinl conditions.
High speed operation, high temperatures, .. d dust ""d dirt all incre .. e the .ear 01 brushes, slip
riDls and bearinlS.
At regular intervals, inspect the terminals for corrasioa and loose
cOftDections,
and the
.irinllor Irayed insulation. Check the mOUDlinl bolts lor tightness, and the belt lor alillllment.
proper tension and wear. Belt tension should be adjusted in accordance with enpae manufacturer'S
recommendations. When tighteniDI belt tnaion, apply pressute against the stator laminations be~
tween the end frames. and not against either end frame.
Noise from an alternator may be caused by .om or
dirty
bearings, loose mounting bolts, a
loose drive pulley, a delective diode, or a delective st.'or.
9-48. Di.a ••• tnltly. After extended periods of operation. or at time of engine overhaul. the alter·
nator may
be
removed from the aireraft for a thoroulh inspection and cleaaJnI of all parts. The
altemator consists of four main components - the two end frames. the stator and the rotor.
To disassemble the alternator, take out the lour thru-bolts, and separate Ihe drive end
Irame and rotor assembly from the stator assembly
by
Pryinl aparr with a screwdriver al the stator
slot. A mark
will
help locate the parts in the same position duriDg assembly. The lit betw .. n
stator and frame is n.ot tight. and the two can
be
separated easily. Note that the separation is to
!>e made between the stator Irame ""d drive el!d frame. Alter disassembly, place a piece of tape
over the slip rinl end frame bearinl to prevent entry of dirt and other loreil" material. and also
place a piece of tape over the shaft on the Slip riD, end. U brushes are to be re-used. clean with
a soft dry cloth.
CAUTIOH
Use pressure sensitive tape and not friction tape which would leave
a gummy deposit on the sbalt.
3
89
ELECTRICAL SYSTEM
ISSUED: 8118172