GMC C Series 1993, Repair Manual

Page: 227 / 264

6D2-6 CS-144 GENERATOR
13. Screw and, terminal insulator (40) from the outside
of the slip ring end frame (figure 10). '
14. BAT terminal nut and washer.
15. BAT terminal from the rectifier bridge.
Figure 10—BAT Terminal Insulator on End Frame
! ! (Later Models)
REPAIR AND TESTING
INSPECTION AND REPAIR
| C l e a n
AH metal parts except the voltage regulator, rectifier
bridge, stator, rotor, and bedring assemblies in a
suitable solvent.
— Wipe or blow the parts dry,
‘• ‘ I I n s p e c t ; ' . "
1. Brush holder for damage.
IQ i Clean
Brush holder. Make sure the brush pockets are
clean. - ;
Brushes with a soft dry cloth.
2. Brushes for wear
■ - (0:4j ipch) dr less
F i g u r e 1 1 — R e g u l a t o r C o n n e c t i o n s
If the brushes are worn to 11 mm
in length, replace the brush hold­
er assembly. Use a retainer pin or toothpick to hold
thei; brushes in the holders.
3- Brush springs for broken wire or corrosion.
4. Slip ring end of the rotor shaft for overheating or
scoring: If signs of overheating or scoring are pre­
sent, replace the rotor: If there is a slip ring end
bearing on the shaft, it must be replaced any time
the two halves of the generator are separated.
: 5. Drive , end bearing for roughness, looseness, or
wear: iff the condition of the bearing is doubtful,
replace it.
6. Windings for burned insulation. Replace the rotor
or stator if either looks burned.
•Burned insulation appears as very dark or
blackened wiring. A strong-acid odor will be
apparent.
7. Terminal connectors for corrosion; or breaks,
8. Windings on the stator for chipped insulation. If the
chipped area is small and the rest of the stator is
OK, repair the stator with insulating varnish.
9. Slip rings for'scoring, wear, or pitting.
A. If the rings are dirty, clean with a 400 grain, or
finer, polishing cloth. ;
B. Spin the rotor and hold the polishing cloth
against the slip rings until they are clean.
C. If scored, worn, or pitted, true the rings in a
; lathe to 0.05 mm (0.002 inch).
' Diminish with 400 grain, or finer, polishing cloth,
; Blow away all dust,
10. Rojdrand stator windings electrically as described
latefl uhder “Electrical Tests.”
11. Generator housing for Cracks, warping, or other
damage.
12. If the regulator, brush assembly or connector needs
replacing, it will have to be unsoldered from the
. other two components. Use as little heat, as possi­
ble to protect the regulator (figure 11).
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