20
4.
The armature or field coils must not be cleaned in degreasing tank or with degreasing compounds
since insulation damage might occur. Ball bearings should be thoroughly cleaned and repacked with
high melting point ball bearing grease. Other parts should be cleaned and carefully inspected for wear
or other damage. Any defective part should be repaired or replaced. On reassembly, all soldered
electric connections should be made with rosin flux. Acid must not be used on electrical connections.
VOLTAGE REGULATOR (C-10 only)
The current voltage regulator is automatic in its control of current and voltage to battery. A grounding strap is
used to connect case of voltage regulator in common ground with engine. If this becomes loose and makes
poor electrical connection, poor regulation can result. Make sure regulator is properly grounded at all times.
Many cases of regulator trouble can be eliminated by a simple cleaning of the contact points plus possible
readjustment. The flat point always develops a slight cavity and is the point that requires most attention. It is
not necessary to have a perfectly flat surface on this point, but cleaning the surface down to pure metal with a
fine cut riffel file will insure long periods of service. The file should not be allowed to become greasy and
should not be used on other metals. After filing, wipe point with lintless cloth, saturated in trichloroethylene
to insure clean surfaces. The flat point is in the armature. Clean by loosening the upper contact support and
moving it to one side.
CAUTION: NEVER USE EMERY CLOTH OR SANDPAPER TO CLEAN
CONTACT POINTS.
Run engine for at least 20 minutes before making voltage adjustments as this will allow temperature of
regulator to stabilize. Use same battery and generator that will be used on engine for correct settings.
Figure 14 Typical Voltage Regulator
Cutout Relay Unit:
This requires three checks and adjustments: air gap, point opening and closing voltage.
The air gap and point opening adjustments must be made with the battery disconnected!
1.
Air Gap:
Place fingers on the armature directly above the core and press armature down until the
points just close, then measure the air gap between the armature and the center of the core. Gap
should be .020". Adjust by raising or lowering armature at its hinge mounting. Retighten screws after
adjustment.
2.
Point Opening:
Adjust point opening by bending the armature stop. Opening should be .020"
3.
Closing Voltage:
Adjust closing voltage by turning screw clockwise to increase spring tension and
voltage, counterclockwise to decrease spring tension and closing voltage. Be sure that closing
voltage
