Yanmar 4LHA-HTP Operation Manual page 378

Chapter 3 Fuel Injection Equipment
6. Governing Mechanism
Maximum-speed
adjusting screw
Flyweight
Fig. 23 Variable speed governor operation: no-load maximum speed control
Furthermore, with an increase in engine speed
after both are balanced, the flyweights' centri-
fugal force will overcome the governor spring's
set force, and will extend the spring while
moving the governor lever assembly.
Therefore, the fuel injection quantity will be de-
creased and high speed control will be per-
formed so that the specified maximum speed
is not exceeded.
When the accelerator pedal is not fully de-
pressed, the governor spring set force may be
varied freely so that governor control may be
Governor sleeve
Starting lever
M i (fixed)
M2 (fulcrum
Control sleeve
Idling spring
Corrector lever
Tension lever
performed in response to partial load condi-
tions.
The full-load injection quantity is determined
according to the amount that the full-load ad-
justing screw is screwed in. When the full-load
adjusting screw is screwed in, the corrector
lever pivots to the left (Fig. 22; counterclock-
wise direction) around point M i and the control
sleeve moves in the fuel-increase direction.
Unscrewing the
moves the control sleeve in the fuel-decrease
direction.
3-1-21
4LHA Serie
Full-load adjusting screw
Ms (fixed)
Cut-off port
full-load adjusting" screw