Kubota M105S, Workshop Manual

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1-M9
M105S, WSM ENGINE
■
At Idling
Turn the speed control lever (3) clockwise to idle the
engine. It tensions the governor spring (4) to pull the fork
lever 2 (5).
When the fork lever 2 is pulled, it moves the torque
spring pin (6) and the fork lever 1 (7) in the direction of
the arrow A to restrain the weight. In combination with
the start spring tension, it is balanced with the centrifugal
force of flywheel weight to keep idling.
W1014143
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At rated speed with full load and overload
As the speed control lever is changed from the middle
speed to high speed, the governor spring tension
increases to compress the torque spring and move the
fork lever 1 in the direction of the arrow A.
The fork lever 2 moves until it reaches the output
limiting bolt to keep rated rotation and rated output.
When the engine is overloaded, the engine rotating
speed decreases and the centrifugal force of flywheel
weight decreases. Then the torque spring moves the
fork lever 1 in the direction of arrow A.
The control rack moves in the direction that increases
fuel supply to increase the output. It is balanced with the
centrifugal force of the flywheel weight to produce low-
speed output (torque output).
W1014385
(1) Flyweight
(2) Start Spring
(3) Speed Control Lever
(4) Governor Spring (5) Fork Lever 2
(6) Spring Pin
(7) Fork Lever 1
(1) No-load Maximum Rotation
(2) Output Limiting Bolt (3) Torque Limiting Bolt
(4) Idling Adjusting Bolt
KiSC issued 03, 2007 A