ELECTRIC PROTECTIVE SYSTEM
4W2218 ELECTRONIC SPEED SWITCH (ESS)
1. Verify button. 2. Reset button. 3. "LED" overspeed light. 4. Seal screw plug (overspeed).
5. Seal screw plug (crank terminate). 6. Seal screw plug (oil step).
To reset speed switch, push in reset button (2).
OVERSPEED SETTING CALIBRATION
Air inlet shutoff must be manually reset.
Remove lockwire and seal from seal screw plugs
Slowly turn overspeed adjustment potentiometer
(4), (5) and (6). Remove seal screw plug (4)
approximately one turn clockwise and do Steps
from access hole for overspeed adjustment
3, 4 and 5 again.
NOTE: More adjustment may be needed to get the
Use a small screwdriver and lightly turn
Turn adjustment potentiometer
overspeed adjustment potentiometer twenty
turns in the direction of "MAX ARROW"
counterclockwise to decrease speed setting.
adjustment potentiometer very slowly only a small
amount at a time until adjustment is correct.
NOTE: The overspeed adjustment screw is made so
that it can not cause damage to the potentiometer, or be
When the speed setting is correct, install seal
removed, if the adjustment screw is turned too many
screw plug (4) in overspeed adjustment access
turns in either direction.
hole. Tighten screw to a torque of 0.20 + 0.03
N-m (2 +.3 lb. in.). Install the lockwire and seal
Run engine at 75% of desired overspeed setting
(if crank termination and oil step adjustments are
Make reference to the SPEED
SPECIFICATION CHART (Part of PROCEDURE
With engine at 75% of overspeed setting rpm,
push VERIFY button (I) and hold in. Turn
overspeed adjustment potentiometer in the
counterclockwise) slowly until "LED" overspeed
light (3) comes on. Engine will shutdown if
speed switch is connected to the fuel shutoff
solenoid and/or air inlet shutoff solenoid.