Buick LeSabre 1965 Service Manual page 583

ELECTRICAL SYSTEMS
GENERATING SYSTEM 1 0 - 1 3
SECTION 10-C
GENERATING SYSTEM
CONTENTS OF SECTION 10-C
10-14
10-15
10-16
10-17
10-18
Subject Page
Description of Delcotron Generator 10-13
Generator Repair - on Bench 10-13
Description of Regulator 10-16
Operation of Charging System 10-17
Trouble-Shooting Charging System 10-18
Paragraph Subject
10-19 Inspecting Charging System
10-20 Cleaning Regulator Contacts
10-21 Delcotron Generator Tests
10-22 Tailoring the Voltage Setting
Page
10-20
10-20
10-20
10-22
1 0 - 1 4 DESCRIPTION OF
DELCOTRON
GENERATOR
'' Delcotron'' * generators a r e
continuous-output, diode- rectified
alternating current generators.
See Figure 10-7. The rotor is
mounted on a ball bearing at the
drive end, and a roller bearing at
the slip ring end, and each bearing
has a grease supply which elimi-
nates the need for periodic lubri-
cation. Two brushes are used to
carry current through the two
slip rings to the field coil which
is mounted on the rotor. The
brushes are extra long and under
normal operating conditions will
provide long periods of service.
The stator windings are assem-
bled on the inside of a laminated
core that forms part of the gen-
erator frame. See Figure 10-8.
* General Motors Trademark
"GRD" TERMINAL
"BAT" TERMINAL
Figure 10-7—• Delcotron Generator
Six rectifier diodes are mounted
in the slip ring end frame and are
connected to the stator windings.
The six diodes act to change the
generator AC voltages to DC
voltage which appears at t h e
"BAT" terminal of the generator.
IMPORTANT: Since the gener-
ator and regulator are designed
for use on only one polarity sys-
tem (negative ground), the follow-
ing precautions must be observed
when working on the charging cir-
cuit. Failure to observe these
precautions will result in serious
d a m a g e to the e l e c t r i c a l
equipment.
1. When installing a battery,
always make absolutely sure the
negative post is toward ground.
2. When connecting a booster
battery make certain to connect
the negative battery terminals to-
gether and the positive battery
terminals together.
3. When connecting a charger to
the battery, connect the charger
positive lead to the battery posi-
tive terminal and the charger
negative lead to the battery neg-
ative terminal.
4. Never operate the generator
on open circuit. Make absolutely
certain all connections in the cir-
cuit are secure.
5. Do not short across or ground
any of the terminals on the gen-
erator or regulator.
6. Do not attempt to polarize the
Delcotron generator.
1 0 - 1 5 GENERATOR
REPAIR—ON
BENCH
a. Disassembly
To disassemble the generator,
take out the four thru-bolts, and
separate the drive end frame and
rotor assembly from the stator
assembly by prying apart with a
screwdriver at the stator slot.
See Figure 10-8. A scribe mark
will help locate the parts in the
same position during assembly.
The fit between stator and frame
is not tight, and the two can be
separated easily. Note that the
separation is to be made between
the stator frame and drive end
frame. After disassembly, place
a piece of tape over the slip ring
end frame bearing to prevent
entry of dirt and other foreign
material.
To remove the drive end frame
from the rotor, place the rotor in
a vise and tighten only enough to
permit removal of the shaft nut.
CAUTION: A v o i d excessive
tightening as this may cause dis-
tortion of the rotor. Remove the
shaft nut, washer pulley, fan and
the collar, and then separate the
drive end frame from the rotor
shaft.
If the rotor shaft has a hex socket
in the drive end, use a 5/16"
Allen wrench to hold the shaft
during removal of the shaft nut.