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.
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 service and repair
is
limited
to testing spring tension and checking
ball
joints.
Sensitivity:
Models prior to
Spec
R (Figure 7-3). 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 on the governor
arm
will
decrease
sensitivity. Fine adjustment 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.
To
test
spring
rates,
use a spring type
scale.
Compare the
measured
rates
with
those
in the table (Fig. 7-2).
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 screw-
driver.
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.
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
orr
the governor arm auxiliary spring (Fig. 7-3), holding the
governor wide open for high
speed
operation. When
de-ener-
gized
the solenoid spring forces the plunger out relaxing the
auxiliary
spring. Adjustments can be
made
by changing
length
of solenoid Unkage.
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
1-amp.
If it is much
greater,
the
contacts
did
not open. If the plunger sticks, remove and clean the
plunger and
recess
in the solenoid.
Standard spring only
used
for lowest
speed.
Auxiliary
and standard springs are
used
for
higher
speeds.
\
GOVERNORX
ARM
AUXILIARY
SPRING
USED
TO
INCREASE
SPEED
Prior
To
Spec
T
SPRING
FASTENED
TO
LEVER
HERE
STANDARD
SPRING
ADJUSTED
TO LOW
SPEED
WITH
AUXILIARY
SPRING
NOT
ENGAGED
FIG.
7-3
19
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