Yanmar 4LHA-HTP Operation Manual page 375

Chapter 3 Fuel Injection Equipment
6. Governing Mechanism
Engine starting
Maximum-speed
adjusting screw
Idling adjusting screw
Flyweight
i g . 20 Variable speed governor operation: engine starting
:
To improve starting characteristics at engine
starting, the normal full-load injection quantity
is exceeded and excess fuel for starting is sup-
plied.
When the accelerator pedal is depressed while
the engine is stationary, the starting lever is
separated from the tension lever by the start-
ing spring and moves to push the governor
sleeve.
Because of this the control sleeve is moved to
the right (the maximum injection quantity direc-
tion; Fig. 20) by the starting lever pivoting
around M2.
Therefore, through lightly
accelerator the engine can be easily started.
Control lever
fSllltllllh
1
1
Starting lever
M i (fixed); pivot bolt
M2 (fulcrum)
Control sleeve
depressing the
3-1-18
Governor spring
Governor sleeve
Idling spring
Point A
Starting spring
Plunger
After engine starting centrifugal force is gener-
ated by the flyweights, the governor sleeve
acts to compress the weak starting spring and
the starting lever is pressed against the ten-
sion lever.
Through this movement the control sleeve is
moved in the fuel-decrease direction, injection
is returned to the full-load injection quantity
range and the supply of excess fuel for starting
is completed. Following this, the tension lever
and the starting lever, in contact at point A (Fig.
20), move together as a single component.
4LHA Series