Allis-Chalmers WD Operating Instructions And Repair Parts Illustrations page 19

cam. Points may be adjusted by loosening
lockscrews and turning adjusting screw.
Reassembling distributor cap to magneto
involves meshing of rotor pinion with dis-
tributor gear as follows: The marked tooth
of rotor drive gear (beveled tooth) must mesh
with tooth marked "G " on rotor gear, If
gaskets are broken they must be replaced.
Make sure the vent holes are open in rotor
AMMETER - The ammeter indicates the charging
or discharging rate of battery. If ammeter
should register discharge ,with lights off,
disconnect the battery cable, to prevent the
discharge of battery, until the difficulty is
located and corrected. Such a condition is
usually caused by a worn or frayed wire
making a short circuit or by cut-off relay
points being stuck together.
If ammeter fails to show a charging rate one of
the following may be the cause:
1. Loose or corroded wire connections.
2. Broken wires
3. Faulty ammeter.
4. Oily or gummy generator brushes or com-
mutator.
5. Worn generator brushes.
Commutator and brushes can be cleaned with
grade "00" sandpaper. (Do not use emery cloth.)
LIGHT SWITCH & GENERATOR CONTROL - The
generator has two charging rates. These are
controlled by the light switch.
When the light switch is pushed all the way
in, the lights are off and the charging rate is
about 3 amperes. When the switch is pulled
out to first notch the lights are on and the
charging rate remains about 3 amperes.
When the light switch is pulled all the way
out the lights are off and the charging rate
is increased to about 10 to 13 amperes. The
high rate of charge should only be used when
the battery is in a partially discharged condi-
tion. In most tractor operations the trend will
be to overcharge the battery.
FUSE - The light circuit is provided with a
20 ampere fuse. This fuse is located on the
inside-of the instrument box.
compartment. If these holes become plugged,
the magneto will not be ventilated. The mag-
neto was permanently oiled at factory and
needs no further lubrication.
For difficulties other than above mentioned
remove the magneto and take it to the nearest
authorized service station for check up and
repair.
ELECTRICAL SYSTEM
RATE CONTROL
1 9
A M M E T E R
INSTRUMENT PANEL
SWITCH