MWM MS 3.9L, Operation And Maintenance Manual, Page: 14 / 53

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4. After achieving the optimal engine speed, turn the control lock clockwise
to hinder it of changing the acceleration by itself while engine is running.
Turn it counterclockwise to change the engine speed regime.
Note : Apply the control lock only after you get the optimal
engine speed regime.
Keep the engine idling whenever the engine is turned
off.
3. To quickly get the engine idling or a fast deceleration, depress the button
and push the control knob.