The M-M speed governor controls the injection volume in accordance with the engine speed at minimum and maximum speeds. At other speed ranges, the fuel volume in accordance with the level of depression of the accelerator pedal is injected. (Except for the control spring, the construction of the all-speed governor and M-M speed governor are basically the same.)
Adjusting Screws
The injection pump has the following adjusting screws:
1. Maximum speed adjusting screwControls the maximum engine speed.
2. Idle speed adjusting screwAdjusts the engine speed during idling.
3. Full-load setting screwAdjusts the maximum fuel injection volume.
HINT:
As the maximum speed adjusting screw and full-load setting screw are adjusted to the proper position and sealed, normally they are not adjusted. However, if due to changes with the passing of time, adjustment becomes necessary, break the seal and perform an adjustment. After an adjustment, the maximum speed adjusting screw and full-load setting screw must be sealed.