Fuel System; Governor - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service

5. FUEL SYSTEM

[1] GOVERNOR

The engine employs the separated fuel injection
pump in combination with Kubota's own small multi-
function mechanical governor, which enable more
dependability.
It also employs the torque limiting mechanism to
control the maximum peak torque so that it complies
with the regulations of exhaust gas.
This mechanism maintains engine speed at a
constant level even under fluctuating loads, provides
stable idling and regulates maximum engine speed by
controlling the fuel injection rate.
This engine uses a mechanical governor that
controls the fuel injection rate at all speed ranges (from
idling to maximum speed) by utilizing the balance
between the flyweight's centrifugal force and spring
tension.
A governor shaft for monitoring engine speed is
independent of the injection pump shaft and rotates at
twice the speed of conventional types, providing better
response to load fluctuation and delivering greater
engine output.
At Start
The stop solenoid (energized-to-run type) is powered
to release the stop lever.
As no centrifugal force is applied to flyweight (2), low
tension of start spring (1) permits control rack to move
the starting position, supplying the amount of fuel
required to start the engine.
(1) Start Spring
III-S-80
Engine
W1013830
(2) Flyweight
W1013967