by
either manual or solenoid control to exert a
greater
than normal force on the governor arm. If a ratchet
lever is
used
to control high
speed,
the system is
variable in nature. See Figure 24. The low
speed
adjustments are the
same
as the constant
speed
adjust-
ments.
High
speeds
of solenoid controlled two-speed
systems
can be adjusted by changing the length of the
solenoid rod.
Maintenance: Linkage must be able to move freely
through
it's entire travel. Periodically lubricate the
ball
joints
with
graphite or
light
non-gumming oil and
inspect the linkage for binding,
excessive
slack, and
wear.. Plastic
ball
joints do not require lubrication.
Testing and Repair: Removing the
gear
cover for
access
to
the governor cup and other internal governor
parts
is
covered in Engine Disassembly Section. External
ser-
vice
and repair is
limited
to testing spring tension and
checking
ball
joints.
To
test
spring
rates,
use a spring type
scale.
Compare
the
measured
rates
with
those
in the table.
Adjustments:
Speed
and sensitivity adjustments for
both
types of governors are
made
at the
same
place
and in the
same
manner. Refer to the illustrations and
the appropriate procedures.
Speed:
Change
spring tension
with
the
speed
adjusting
nut
while
holding the sensitivity stud in place
with
a
screwdriver. More tension gives more
speed.
To
adjust the high
speed
of solenoid controlled two-
speed
governors,
change
the tension on the high
speed
spring
by adjusting the length of the solenoid rod.
Shorten the rod to
increase
tension and
speed.
Sensitivity:
Models prior to
Spec
R (Figure 24). There
are
coarse
and fine adjustments for sensitivity. The
coarse
adjustment is
made
by relocating the spring in
the
notches
in the governor arm.
Moving
the spring up
the governor arm
will
decrease
sensitivity. Fine adjust-
ment is
made
by changing the number of
effective
coils
in
the governor spring by turning the sensitivity stud
farther in or out. Turn the stud counterclockwise to
increase
sensitivity. Adjust for maximum sensitivity
without
a hunting condition.
Governor
High
Speed
Solenoid: This solenoid mounts on
the blower housing. When energized the plunger is in
the solenoid body. This
exerts
a
greater
than normal
force on the governor arm auxiliary spring (Figure 24),
holding
the governor wide open for high
speed
opera-
tion.
When de-energized the solenoid spring forces the
plunger out relaxing the auxiliary spring. Adjustments
can be
made
by changing length of solenoid linkage.
The solenoid contains two coils. Both are energized for
pulling
the plunger into the solenoid body. When the
plunger hits bottom, it
opens
a set of contacts, de-
energizing the
pull-in
coil.
The other
coil
holds the
plunger in.
To
test
the solenoid, check plunger operation and
current draw
with
12-volt input. Current draw
with
the
plunger up should be about one amp. If it is much
great-
er, the
contacts
did not open. If the plunger sticks,
remove and clean the plunger and
recess
in the sole-
noid.
Standard spring only
used
for lowest
speed.
Auxiliary
and standard springs are
used
for
higher
speeds.
\
GOVERNOR\
ARM
-
AUXILIARY
SPRING
USED
TO
INCREASE
SPEED
SPRING
FASTENED
TO
LEVER
HERE
STANDARD
SPRING
ADJUSTED
TO LOW
SPEED
WITH
AUXILIARY
SPRING
NOT
ENGAGED
FIGURE
24.
GOVERNOR
ADJUSTMENTS
(PRIOR
TO
SPEC
R)
24
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