Caution
dowels is done in accurate jigs at the
Do not press the contacts together
factory in order to maintain the air gap at
the bottom of the armature within close
too tightly as this procedure deflects
limits. If the hinge spring should become
the supporting springs and sanding
damaged, the armature iron and hinge
operation will result in misalignment
spring assembly must be replaced as a
of faces in normal operation which
unit as it cannot successfully be repaired.
occurs at very light contact pressure.
The armature rocks on two stainless steel
ball pivots which are pressed into the
(3) Unnecessary and excessive contact
edge of the top plate.
sanding will only shorten the useful life of
(3) Reference to figure 44 will indicate the
the contact and require more frequent
connections of the resistors used in
renewal. The contacts should not be
conjunction with the regulator. When the
sanded until the contacts are to be spaced
engine is not running, the regulator spring
out by washers.
holds the moving contact against the right
(4) Replace the moving contact before the
hand stationary contact. This causes the
worn surface reaches the edge of the
resistor in series with the auxiliary
groove at the center of the contact.
generator field to be paralleled by the R.
Replace the stationary contact when the
H. stationary contact.
worn surfaces are within 1/32"of the brass
(4) If the engine is started and brought up to
cylinder in the contact.
idling speed the voltage of the auxiliary
generator increases to the value for which
Caution
the regulator is adjusted. When this
When tightening or replacing the
occurs the magnetic pull of the regulator
moving contact or tightening any of
coil overcomes the spring tension and the
the screws in the moving armature
moving contact swings away from the R.
assembly always hold the armature
H. contacts. This breaks the current
firmly with one hand while using the
flowing through its resistor and lowers the
screw driver or socket wrench with
auxiliary generator field current, thus
the other. This is to prevent twisting
lowering the generated voltage slightly.
the stainless steel hinge spring (fig.
The magnetic pull the regulator coils is
weakened and the spring again closes the
contacts. This vibrating action is rapid
enough so that no flicker will occur in the
(5) If it should be necessary to replace the
lights.
regulator coil, remove the regulator panel
b. Maintenance.
from the main panel and do the work on a
workbench where the renewal of parts can
(1) The sparking is fundamentally normal and
be facilitated under adequate and suitable
will in time produce slight pitting on the
conditions. To remove the coil, remove
graphite contact surfaces.
the top screws holding the bottom plate of
(2) Adjust the contacts that have worn so that
the frame to the core, and the single
the gap between them is greater than
screw holding the plate to the panel. After
one-eighth of an inch by moving the
removing the coil leads, it may be slipped
stationary contact outward by the use of
off the core. When installing the new coil,
one of the extra flat washers provided
see that the mating surfaces of the bottom
under the head of the contact holding
i)late and core are clean and free from
screw.
Mark the contacts before
burrs and that no shred of insulation
removing stationary contact so that it can
becomes pinched between them. Never
be put back without rotating it with
touch a file to these surfaces or the
reference to the moving contact. After
accuracy of the armature air gap will be
spacing the contact out or when new
lost. When replacing the bottom plate,
graphite contacts are installed, carefully
set all three screws up fingertight, before
sand to insure a good contact surface
finally tightening any of them with
over the entire face. Use a strip of No. 00
screwdriver.
sandpaper between the two surfaces while
pressing the contacts lightly together.
59