Piper PA-32R-301T SARATOGA S Maintenance Manual Download

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D.C. GENERATION (cont.)

(5) Service Procedures

Since the alternator and regulator are designed for use on only one polarity system, the following

pre- cautions must be observed when testing or servicing the electrical system. Failure to observe

these precautions will result in serious damage to the electrical equipment.
(a) Disconnect battery before connecting or disconnecting test instruments (except voltmeter) or

before removing or replacing any unit or wiring. Accidental grounding or shorting at the regulator,

alternator, ammeter or accessories, will cause severe damage to units and/or wiring.

(b) Alternator must not be operated on open circuit with the rotor winding energized.

may result in damage to alternator, regulator or circuits.

(d) Grounding of alternator output terminal may damage the alternator and/or circuit and

components.

(e) Reversed battery connections may damage rectifiers, wiring or other components of the

charging system. Check battery polarity with a voltmeter before installing. Most aircraft are

negative ground.

(f) If a booster battery or fast charger is used, its polarity must be connected correctly to prevent

damage to the electrical system components.

(6) Overhaul of Alternator

Complete disassembly may not be required when repairing the alternator, . In some cases it will

only be necessary to perform those operations which are required to effect the repair. However, in

this section, the complete overhaul is covered step-by-step to provide detailed information on

each operation. In actual service practice, use only the required operations.
(a) Disassembly of Alternator

1 Remove two Number 10-24 screws holding brush holder assembly in slip ring end head.

Remove t brush and holder assembly from end head.

2 Remove safety wire from through bolts. Hold pulley with a strap wrench and remove

pulley nut. Pulley must be removed with a puller. Remove fan, woodruff key and spacer

from shaft.

3 Remove four through bolts and tap drive end head lightly to separate drive end head and

rotor, as a unit, from stator and slip ring end head.

4 Remove nuts, lock washers, flat washers and insulators from output and auxiliary termi-

nal studs. Note carefully the correct assembly of insulator washers and bushings. Using

special tools shown in Figure 6, support the end head and press out the three negative

rectifiers. End head can now be separated from stator assembly.

5 Use a hook type or impact type bearing puller, as shown in Figure 5, to remove slip ring

end bearing and grease seal. Do not remove bearing unless replacement is necessary.

— NOTE —

The inner race of the slip ring end bearing is pressed onto the
rotor shaft. When bearing replacement is necessary, always
replace the complete bearing assembly, including the inner
race.

Piper PA-32R-301T SARATOGA S, Maintenance Manual

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