Yanmar 6CXM-GTE2 Service Manual download pdf (Page 78)

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3.11.2 Governor

(1) Feature

The two-point weight centrifugal type all speed control governor is directly coupled with the fuel pump. The governor

weight assembly, driven by the pump shaft end, controls the control rack of the fuel pump to adjust the fuel injection quan-

tity.

1) Condition during engine start

When the control lever is pulled to the starting position, the governor weights are closed by the force of the governor

spring, and the linkage connected to the shifter moves the control rack to the maximum injection position.

2) Conditioning during idling

As the engine starts and the control lever is returned to the idle position, the spring retainer returns and the governor

spring force is reduced.

The governor weights are opened by the centrifugal force and push the control rack to reduce the fuel. The weight force is

balanced with the spring force to maintain the idling speed.

3) Condition during maximum speed

When the engine reaches its maximum speed, the weight force is balanced with the governor spring force and the rack is

kept at the appropriate injection position. If the engine load is reduced, the engine speed increases and the governor

weights open. The rack is then moved to reduce the engine speed, to return it to the specified maximum. The maximum

fuel quantity is limited by the fuel injection limit screw. Do not try to adjust the injection limit screw except when neces-

sary since it is sealed.

When the stop lever is turned to the stop position, the control rack is moved to the stop position,

regardless of the governor spring force, and stops the engine.

4) Damper spring

To prevent engine stoppage on sharp engine speed reduction, damper spring is equipped.

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Yanmar 6CXM-GTE2 Service Manual Page 78