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GM COACH MAINTENANCE MANUAL
Sec. 7
Page 121
Generator (fig. 18) is a heavy duty, six-brush,
shunt type unit. The armature shaft is supported
by a roller bearing in the drive end frame and
by a ball bearing with a grease seal in the com-
mutator end frame.
Brush holders are of one-
piece construction and are mounted on the com-
mutator end frame.
Insulated holders are elec-
trically insulated from the commutator end frame
by bakelite pads.
Each brush holder is held in
position by two countersunk
screws
extending
through the commutator end frame.
Special two-
piece brushes of laminated construction are used.
Air entering generator must pass through an
oil-wetted air strainer which is mounted on com-
mutator end frame.
Air passes through generator
and is discharged through an opening in the drive
end frame into a tube leading to engine air clean-
er manifold.
Refer to FUEL SYSTEM (SEC. 12)
for illustration of air outlet tube installation.
Generator is mounted on engine flywheel hous-
ing and is driven from the engine balance shaft
through a step-up gear arrangement (fig. 17).
INSPECTION AND MAINTENANCE
Normal service may be obtained from gener-
ator with a minimum of trouble if regular inspec-
tion and maintenance procedures are followed.
LUBRICATION
Roller bearing at drive end and ball bearing
at commutator end are lubricated through grease
cups.
Refer to LUBRICATION (SEC. 13) for type
of lubricant and intervals of application.
Air
strainer at commutator end must be cleaned reg-
ularly.
CLEANING
Exterior as well as interior of the generator
assembly should be kept clean. Use a clean cloth
dampened with cleaning solvent to wipe off excess
grease. Do not steam clean or dip generator into
a cleaning solvent.
Avoid getting any water or
cleaning solvent in generator. If interior is dirty,
remove and disassemble generator and clean in-
dividual parts. Use only cleaning solvents derived
from petroleum such as kerosene or gasoline.
Never use chemical solvents or alkalines since
these may damage the insulation.
COMMUTATOR
The cover band should be removed and com-
mutator inspected at 5,000 mile intervals. If com-
mutator is dirty,
clean with a strip of No. 00
sandpaper. No not use emery cloth. Blow all dust
out of generator after cleaning commutator.
BRUSHES
Check the surface of the brushes making con-
tact with commutator to make sure they are seat-
ing properly.
They can be seated with a brush
seating hone.
Do not use emery cloth or sand-
paper for seating brushes. With generator opera-
ting at medium speed, press seating hone firmly
against commutator to cover area contacted by
brushes.
Brushes should seat satisfactorily in a
short period.
Blow out all particles of abrasive
and dust after seating.
Worn brushes should be
replaced and new brushes seated.
NOTE:
When new brushes have been
installed,
it
is necessary to adjust gener-
ator neutral point as directed later under
"Generator Assembly."
1 Oil Passage
2
Engine Balance
Shaft
3
Balance Shaft Gear
Retaining Nut
4
Balance Shaft Gear
5
Internal-Toothed
Drive Gear
6
Driven Gear
Retaining Nut
7 Flywheel Housing
8
Baffle
9
External-Toothed
Driven Gear
10 Oil Slinger
11 Armature Shaft Oil
Seal
12 Armature Shaft
13 Flat Washer
14 Generator Commu-
tator End Frame
15 Mounting Stud
16 Mounting Stud Nut
17 Cotter Pin
TP-6333
Figure
17-Generator
Step-up Drive Arrangement
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