NEEDLE-ROLLER 2151402 - Caterpillar

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).Oil Step Calibration
1. Remove the lockwire and seal from seal screw plugs (4), (5) and (6). Remove seal screw plug (6) from access hole for the oil step adjustment screw.2. Use a small screwdriver and lightly turn oil step adjustment potentiometer 20 turns in the direction opposite of "MAX ARROW" (counterclockwise). This will lower the oil step speed setting to its lowest value. The oil step adjustment screw is made so it can not cause damage to the potentiometer, or be removed, if the adjustment screw is turned too many turns in either direction.3. Use a 6V7070 Multimeter (or a voltmeter of same accuracy) to check for positive (+) voltage at terminal ESS-13 [negative (-) voltage is at terminal ESS-5].4. Make reference to SPEED SPECIFICATION CHART (Part of PROCEDURE D). For a particular engine rating, find the specified rpm in column for Oil Step Speed Setting. Run the engine at this specified rpm.5. With the engine running, look into the oil step adjustment access hole. A red "LED" (light emitting diode) light will be on. After an 8 to 10 second delay, positive (+) voltage will be seen at terminal ESS-13. Now turn the oil step adjustment potentiometer clockwise until the red light in the oil step access hole goes out. When the light goes out, this indicates that the oil step rpm setting is above the present running rpm of the engine. Slowly turn the adjustment potentiometer counterclockwise until the light comes back on. After an 8 to 10 second delay, positive (+) voltage will be seen at terminal ESS-13.6. When the oil step setting is correct, install seal screw plug (6) into the adjustment access hole for the oil step function. Tighten plug to a torque of 0.20 0.03 N m (2 .3 lb. in.). If all other adjustments are complete (overspeed and crank terminate), install lockwire and seal.