Piper COMANCHE PA-24-180 Service Manual page 575

Alternator Model
Voltage
Rated Output
Output Test (770 F):
Volts
Amperes Output
Field Amperes
Alternator RPM
PIPER COMANCHE SERVICE MANUAL
cavities. Use a pin or a piece of wire, as shown in Figure 9-27n, to hold the brushes in the holder during
assembly. Remove the pin after the brush holder retaining screws have been tightened Make a
continuity check to be sure the brushes are seated against the slip rings.
d. Drive Pulley: Torque the drive pulley retaining nut to 35 foot pounds.
e. Ventilation: The 8400 series units use a slip ring end cover that ha a hose type connec-
tion for air pressure ventilation. Remove this cover when bench testing the alternator.
9-611. Alternatr Service Test Specifications. Prestolite specifications
nator installed as standard equipment on PA-24 airplanes are as follows:
for the 12-volt alter-
ALX8403
12-volts
70 amperes
Ground Polarity
Rotation
Rotor
Current Draw (77' F)
Resistance (770 F)
Negative
Bi-Directional
2.9 to 3.3 amps i 12.0-volts
3.7 to 4.1 ohms
13.0
10.0
2.85
1780 min.
14.2
71.5
3.15
5000 min.
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3 C5