Yanmar 4LHA-HTP Operation Manual page 374

Chapter 3 Fuel Injection Equipment
6. Governing Mechanism
Tension lever
Idling spring
Corrector
lever
M i (fulcrum; fixed by pivot bolt)
Fig. 19 Variable speed governor lever assembly
Control
lever
shaft
Starting lever
Ball joint
3-1-17
Four flyweights are mounted in the flyweight
holder, and with rotation these open outward
through centrifugal
moves the governor sleeve in an axial direc-
tion, resulting in the governor sleeve pushing
the governor lever assembly.
The governor lever assembly consists of the
corrector lever, tension lever, start lever, start
spring and the ball joint. (Fig. 19)
The corrector lever's fulcrum M i is fixed at the
pivot bolts in the pump housing and as its bot-
tom portion is being pushed by the springs in
the distributor head, and the top portion is
being pushed by the full-load adjusting screw,
the corrector lever cannot move at all.
The starting lever, separated from the tension
lever by the starting spring only at engine start-
ing, moves the governor sleeve to close the
flyweights. As a result of this the ball joint at
the bottom of the
around the tension and starting levers' com-
mon fulcrum M2, can move the control sleeve
in the fuel-increase direction (i.e. toward the
distributor head side) for engine starting.
During engine operation the starting lever and
the tension lever are in contact and move
together as a single component. The top of the
tension lever is connected to the control lever
through the governor spring.
An idling spring is mounted on the retaining pin
at the top of the tension lever.
Governor construction is such that governor
control over the entire speed range is per-
formed by the operation of all these springs.
4LHA Serie
force. This movement
starting lever, pivoting