Assembling End Shield Sub-Assemblies; Bench Run-Up Test - Piper Cherokee Six Service Manual

PIPER CHEROKEE SIX SERVICE MANUAL
10-25. ASSEMBLING END SHIELD SUB-ASSEMBLIES. Position the
rotor and drive end
shield assembly on the rectifier end shield. Align the through bolt holes through
the drive
end shield, stator and the rectifier end shield.
Compress stator and both end shields by hand and install the through bolts.
Install the insulated brush and holder, terminal, insulating washer,
lockwasher and
terminal attaching screw. Install the ground brush and attaching screw.
Rotate the pulley slowly by hand to be sure that the rotor fans do not
hit the rectifiers
and stator connectors.
After installing the alternator on the engine, always test the complete charging
system to
be certain it is functioning properly.
NOTE
New through bolt locking tabs should be installed at each
alternator disassembly. Torque through bolts evenly to 25
inch pounds and bend both ears of the locking tabs against
bolt head. Check proper belt tension.
10-26. BENCH RUN-UP TEST. This test is to be performed at room ambient
conditions
and consists of four checks which are to be made quickly to avoid heating
of the windings.
These are as follows:
NOTE
For test c and d external field excitation may be used but
must be removed and self excitation used to obtain output
amperes. (Refer to Figure 10-24 for meter connections.)
a. With the alternator at rest, apply 15 volts between the alternator battery
termina
and ground with polarity such that the rectifiers will block current flow (positive
of supply
to positive of the alternator). Monitor rectifier reverse current which shall
be not more than
I milliampere.
b. With the alternator at rest, apply 15 volts to the field circuit and
monitor field
current. This shall be between the limits of 3.3 amperes minimum
and 3.6 amperes
maximum.
c. Drive the alternator at 1500 rpm with an electrical load connected to the alternator.
Adjust the load to obtain 15 volts. Net output (not including field current)
shall be not less
than 26.5 amperes.
d. Drive the alternator at 2500 rpm with an electrical load connected to
the alternator.
Adjust the load to obtain 15 volts. Net output (not including field current)
shall be not less
than 49.0 amperes.
ELECTRICAL
SYSTEM
Issued: 8/17/72
3B14