Kubota EA330-E4 Series Workshop Manual page 55

EA330-E4, WSM
 At Idling to Maximum Speeds
When the engine rotates at idling to maximum speeds, engine rotates at a constant speed at the point where the
governor spring tension and the governor weight's centrifugal force are well balanced. If the load is increased, the
engine speeds down and the centrifugal force of the governor weight (4) becomes smaller, so that the control rack
(10) is moved in the direction C in which fuel is increased to restore the original speed. In this way, the engine speed
is automatically controlled for a constant revolution.
 At Maximum Engine Speed
When the speed control lever (7) is moved in the direction "A", the governor weight (4) is at the maximum
centrifugal force, with the governor lever (6) contacting the fuel limiter (8). As the load becomes large, the speed is
reduced, decreasing the governor lever pushes the fuel limiter (the limiter contains a spring) and moves in the
direction "C". Thus, the control rack (10) is placed at the maximum fuel injection position, producing the maximum
engine output power.
 At Engine Stop
When the speed control lever (7) is moved fully in the direction "B" to the stop position, arm pushes the governor
lever pin to move the governor lever (6) in direction "D", thus the control rack (10) is set to the stop position (No fuel
injection) and the engine stops.
Fuel Limiter Apparatus Construction
At starting and maximum power point, the governor
lever (2) of the fuel limiter pushes the pin (3), which
touches the lock screw (4) and stops. As a result, the
control rack (1) moves to the position at which point the
largest amount of fuel is injected.
(1) Control Rack
(2) Governor Lever
1-M22
ENGINE
(1) Governor Spring
(2) Stop Spring
(3) Crank Gear
(4) Governor Weight
(5) Governor Shaft
(6) Governor Lever
(7) Speed Control Lever
(8) Fuel Limiter
(9) Idling Spring
(10) Control Rack
9Y1211018ENM0038US0
(3) Pin
(4) Lock Screw
9Y1211018ENM0039US0
KiSC issued 05, 2015 A