Yanmar 4LHA-HTP Operation Manual page 377

Chapter 3 Fuel Injection Equipment
6. Governing Mechanism
Full-load and no-load maximum speed control
muzi
Maximum-speed
adjusting screw >
Flyweight
Fig. 22 Variable speed governor operation: full-load operation maximum speed control
When the accelerator pedal is fully depressed
and the control lever has contacted the max-
imum speed adjusting screw, the tension lever
contacts the pin (Ma) press fitted to the pump
housing (i.e. where the full-load
quantity is obtained) and can move no further.
At this time the governor spring set force is at
a maximum. Because of this, the idling spring
M i (fixed)
M2 (fulcrum)
Control sleeve
injection
3-1-20
Idling spring
Full-load adjusting screw
Tension lever
Corrector lever
Ma (fixed)
is fully compressed and the flyweights, being
pushed by the governor sleeve, are closed.
Then, although the centrifugal force of the
flyweights increases with the increase in en-
gine speed, the flyweights cannot move the
governor sleeve until the governor spring's set
force has been overcome.
4LHA Series