Fuel System; Governor - Kubota WSM 07-E3B Series Workshop Manual

07-E3B SERIES, WSM

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 enables 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.
(1) Idle Limit Spring
(2) Injection Pump
(3) Control Rack
(4) Start Spring
(5) Torque Spring
(6) Output Limiting Bolt
(7) Torque Limiting Bolt
 At Start
The stop solenoid (4) (energized-to-run type) is
powered to release the governor connecting rod (2).
As no centrifugal force is applied to flyweight (5), low
tension of start spring (3) permits control rack (1) to move
the starting position A as showing the arrow, supplying
the amount of fuel required to start the engine.
(1) Control Rack
(2) Governor Connecting Rod
(3) Start Spring
(4) Stop Solenoid
(5) Flyweight
M-11
ENGINE
(8) Stop Solenoid
(9) Fork Lever 1, 2
(10) Governor Sleeve
(11) Flyweight
(12) Governor Spring
(13) Governor Connecting Rod
W1013830
A : To Start Position
W1013967
KiSC issued 06, 2020 A