Yanmar 4LHA-HTP Operation Manual page 427

Chapter 3 Fuel Injection Equipment
1. Fuel Supply System
1-5 G o v e r n o r construction
Diesel engines are used in extremely varied conditions,
with a wide range of loads and rpms. The governor
has the important function
injection quantity. It quickly responds to changes in
rpm by adjusting the position of the control rack.
The governor weight is mounted on the end of the fuel
injection pump cam shaft. It
governor support pin, driven by the cam shaft, and is
forced outwards by the centrifugal force acting on the
weight.
The thrust force on the cam shaft due to this cen-
trifugal force acts on the lower part of the tension
lever via the sleeve. A n excess fuel spring for starting
is mounted on the bottom of the tension lever.
One end of the governor spring is hooked to the right
upper end of the tension lever, and the other end to
the spring lever on the control lever shaft.
The spring lever and control lever are mounted on the
same shaft, so by turning the control lever towards
full, the governor spring is pulled and the load gradual-
ly rises.
The tension lever can move freely around the governor
shaft on the player bearing. As the speed increases and
the shifter is pushed to the left, the tension lever
rotates clockwise. A n d when the speed falls, the
tension lever rotates counterclockwise.
of controlling the fuel
Fig. 1 Governor with torque rise spring
Tension lever
Fuel limit bolt
(Stopper)
Speed control
lever
Angleich spring
Excess fuel spring
(Start spring)
rotates around the
3-2-5
Y P E S - A L fuel injection pump is equipped with the é
speed type governor.
types: one has the t o r q u e rise spring (angleich sprini
(Fig. 1), and the o t h e r
(angleich spring) (Fig. 2 ) .
Governor
spring
Shifter
G o v e r n o r weight
The governor lever rotates smoothly on the same
governor shaft. The b o t t o m part of this lever is in
contact with the sleeve through the shifter, which is
itself in contact w i t h t h e bottom of the tension lever
through the excess fuel spring. It therefore moves with
the tension lever according to the rise or fall of the
engine speed.
The top of the governor lever is connected to the fuel
pump control rack through the governor link. The
movement of the lever controls the volume of fuel
injected by the p u m p . A s the speed increases, the lever
rotates clockwise and moves the control rack to reduce
fuel, and when the speed falls the lever rotates counter^
clockwise to cause the control rack t o pass more fuel.
Thus, the engine speed is controlled.
The top of the tension lever comes in contact with the
stopper built into the t o p of the governor case to limit
the maximum fuel injection volume.
4LHA Seri
T h e governor is available in
has the smoke cut sprir