Mitsubishi 4DQ50 Service Manual page 45

condition, will push back the shifter from the tension-lever which is contacted with the
idling-sub-spring. Accordingly, the stroke of the control-rack will become larger automati-
cally.
Whether the pin attached to the lower end of the floating-lever with wax will be inserted
in the slot of the supporting-lever on the shaft of the stop-lever or it will be supported so
that it will act at the fork part which is pushed into the. governor cover, will be fixed as to
whether or not the governor has the stop-device. A governor of standard size has no
stop-device. But the device will be necessitated when you want to pull back the control-rack
of the injection pump with a slight power without regarding the position of control-lever of
governor or to use the stopper-bolt as the stopper of the limit of the idling r.p.m.
(2)
PRINCIPLE OF OPERATION
The principle of the governor operation is as follows:
When the r.p.m. of engine increases and its centrifugal foece becomes larger than the
spring force, the flyweight will spread outside. When the r.p.m. decreases the centrifugal
foece will decrease and consequently the controlling power of the governor spring will
become stronger so that if folds itself inside again.
The action of the flyweight is transmitted to the control-rack through the guide-bush,
shifter and link. And the control-rack, when the r.p.m. of engine increases, will be moved in
the stop direction. Then the r.p.m. is limited because the injection pumpsupplies smaller
amount of fuel. When the r.p.m. of engine decreases the process will be reversed. This RSV,
as an all-spread governor, controls the rotations of all kinds covering from the idling r.p.m.
to the maximum r.p.m. outomatically.
If the driver or the operator of the machine will adjust once the control-lever at the
necessary engine r.p.m. by operating pedals or handles, then the governor will adjust the
r.p.m. automatically.
Now let us explain the special operating conditions by taking up severa, cases for
example. Fig. 3 is the performance curve of these operations.
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