VALVE GP-AIR CONTROL 9D3886 - 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).Crank Terminate Speed Adjustment
1. Remove lockwire and seal from seal screw plug (4), (5) and (6). Remove seal screw plug (5) from the access hole for crank terminate adjustment screw.2. Use a small screwdriver and lightly turn the crank terminate adjustment potentiometer twenty turns in the direction of "MAX ARROW" (clockwise). The crank terminate adjustment screw is made so that it can not cause damage to the potentiometer, or be removed, if the adjustment screw is turned too many turns in either direction.3. Turn the crank terminate adjustment potentiometer twelve turns in a direction opposite of "MAX ARROW" (counterclockwise) for an approximate crank terminate setting.4. Connect a voltmeter (6V7070 Multimeter or a voltmeter of same accuracy) with the positive lead at ESS-12 and the negative lead at ESS-5. Start the engine and make a note of the speed at which the system voltage is canceled (this is the speed at which the DC starter system disengages). See the SPEED SPECIFICATION CHART (Part of PROCEDURE D) for the correct crank terminate speed. If setting is not correct, do Steps 5, 6 and 7. If setting was correct, go to Step 7.5. Stop the engine and turn the crank terminate adjustment potentiometer one full turn in the correct direction (clockwise to increase and counterclockwise to decrease).6. With the voltmeter still connected as in Step 4, start the engine and make a note of the speed at which the system voltage is canceled (this is the speed at which the DC starter system disengages). If needed, make more small adjustments until the crank terminate speed is correct.7. Install seal screw plug (5) in crank terminate adjustment access hole. Tighten to a torque of 0.20 0.03 N m (2 .3 lb. in.). Install the lockwire and seal (if overspeed and oil step adjustments are complete).