GOVERNOR
SYSTEM
The purpose of the governor is to maintain a constant
engine
speed
during
changes,
in power
demands.
A
governor
responds
to
changes
by varying the throttle
position.
Three types of governors are used: The con-
stant
speed
governor
which
is standard, the two-speed,
and variable
speed
governors
which
are optional.
Two-speed and variable-speed Onan governors are
basically
similar to the constant
speed
type. The
difference
is a second spring,
riding
in a sleeve,
connected to the governor arm. It is completely relaxed
during
low
speed
operation, but combines
with
the
constant (or low)
speed
spring when brought into play
GOVERNORS
The constant
speed
governor (Figure 23) maintains
engine
speed
up to 2400rpm. The
speed
sensing device
is
a
ball
and cup mechanism on the camshaft
gear.
A
yoke,
resting on the cup, is connected to the governor
arm, which
in
turn
is connected to the throttle lever.
Any
change
in engine
speed
is transmitted
from
the
cup to the yoke, and onto the throttle.
Tension on the governor spring determines the
speed
at
which
the engine is governed. The position of the
spring
loop on the governor arm determines the amount
of
leverage the spring exerts on the arm to obtain the
desired sensitivity. For
engines
prior
tp
Spec
R refer
to
Figures 23 and 24 for adjustment. For
engines
begin-
ning
with
Spec
R, refer to Figure 25.
GOVERNOR
SPRING
DATA
GOVERNOR
TYPE
SPRING
NO.
SPRING
RATE
COIL
NO LOAD
LENGTH
ACTIVE
COILS
Constant I50A82I
—
1-3/8"
13-3/4
t Variable
or
2 Speed
I50A9I9
25#/inch
1-1/4"
18
'
•
2
Speed 150A920
l5#/inch 2-3/32"
30
*
=
ISOOrpm
and t =
2400rpm.
GOVERNOR
ARM
GOVERNOR FLYBALLS
GOVERNOR YOKE
INJECTION
PUMP
TURN
TO
INCREASE R.P.M.
(HOLD SPRI
NG
STUD
N POSITION)
GOVERNOR
SPRING STUD"
Governor
arm
must
'^.^
GOVERNOR ENGIN E SPEED
be flush with bottom
^Sr»
SPWNG
NUT
ADJUSTMENT STUD
of hole
in
governor shaft. A935 *
4A
*^
*
ND NUT
TURN
FOR
MINIMUM
SPEED DROP. THEN
ADJUST
NUT
FIGURE
23.
GOVERNOR ASSEMBLY (PRIOR
TO
SPEC
R)
23
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