Mitsubishi 4DQ50 Service Manual page 41

move to the right hand as lower part (A) is supporting point and pullback the
cont~ol
rack to the idling position.
Centrifugal force of flyweight, weak force of control spring and spring force of
start spring act each other and keep the smooth idling by this force balance.
As efjgine speed rise, centrifugal force of flyweight becomes large and push the
contrpl spring and floating lever moves to the right hand, and transfer the
contrpl rack to the fuel feed "decrease".
As engine SP~ becomes to fall, it acts the opposite action of above and keep
the constant idling by this action and reaction. Fig.
3-30
shows the situation of
max. !!ngine speed control.
Camshaft bushing
Stopper
bolt
Fig.3-30 RUV governor, movement of
max.
engine speed
control
When the engine speed rise from regulation speed by the rapid down of load
while the engine running, centrifugal force of flyweight overcome the spring
force of control spring, and flyweights expand to the outside and move the
gover.,or sleeve to the right hand. (as illustrated arrow mark) At this time
supporting point (8) of floating lever, which contact to the governor sleeve,
move
lO
the right hand as (A) is supporting point.
Therefore it moves control rack to the fuel feed "decrease" and acts not to
over the regulation max. speed.
4) In any: case whatever, don't tamper with the seals on (Fig. 3-31),
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