Doosan V158TI Operation & Maintenance Manual page 206

(2) Adjusts the initial engine speed.
IMPORTANT
After turning the initial speed switch ON again, use the idle potentiometer to adjust the speed
to 800 rpm.
Purpose of adjustment: Adjusting the initial amount of fuel for starting the engine and for the
preheating function after starting the engine.
Recommended direction: 12 o'clock to 3 o'clock. There are differences in the direction for
each engine model or rated rpm but we recommend an engine rpm of 800.
IMPORTANT
Problems when adjusted incorrectly: The initial starting performance is degraded and
excessive fuel consumption occurs while preheating.
One must not overlook the fact that the idle speed is one of the main factors which
determines the start-up characteristics of the engine.
Hence, after adjusting the potentiometer, the initial speed must be adjusted regardless of
whether or not idle mode is used.
6. Adjusting the Governor Characteristics
(1) After disconnecting the G-M terminal (initial
speed switch OFF), adjust it when the
engine reaches the operating speed (run
speed).
(2) Adjust the gain.
IMPORTANT
Turn the gain potentiometer clockwise
until the engine becomes unstable in
an unloaded state.
Slowly turn the gain potentiometer
counterclockwise and set it at the
position that the rpm becomes in the
most stable state.
For the sake of stability, turn the gain
potentiometer around 20 arcminutes
(10°) in the counterclockwise direction.
7. Adjusting the stability
(1) Turn the stability potentiometer clockwise until the engine becomes unstable in an unloaded state.
(2) Slowly turn the stability potentiometer counterclockwise and set it at the position that the rpm
becomes in the most stable state.
(3) For the sake of stability, turn the stability potentiometer around 20 arcminutes (10°) in the counter-
clockwise direction.
Speed
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Gain Sta bility
DV2213196B