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Part No. 917543 Rev. A November 1992
7.1.7. Photocoupler/Pulser Disc Replacement
Note: Pulser discs are fragile. Care should be taken when removing the pulser
components.
1. Remove the hex head 1/4-20 screws and cover from the pulser assembly.
2. Disconnect the cable to the photocoupler.
3. Remove the screw holding the photocoupler to the housing and loosen the
set screws holding the pulser disc on the shaft. Pull pulser parts up and
out of the housing.
4. Slip the new pulser parts into the housing. Tighten the screw holding the
photocoupler. Adjust the disc so it is centered in the slot and tighten the
set screws. Centering the disc is very important to avoid damage to the
photocoupler and disc. On newer dispensers the pulser shaft will have a
“step” on it; in these dispensers simply push the pulser disc down until it
contacts the step and tighten the screws the disc will automatically be
centered.
5. Reconnect the cable to the photocoupler.
6. Rotate the disk through two or three revolutions to insure that it does not
contact the photocoupler.
7. Replace the cover with the hex head screws removed in step 1.
7.1.8. Nozzle Boot Switch Replacement
A. MICRO SWITCH STYLE
Note: It may be necessary on certain model dispensers to remove the nozzle boot in order
to access the handle switch. If so, remove the nozzle boot taking care to disconnect
the wiring harness from the handle switch as the boot is being removed.
1. Remove the two (2) 6-32 screws which secure the handle switch to its
mounting bracket.
2. Install the new switch using the previously removed screws.
3. Reinstall the nozzle boot if it was previously removed.
4. Connect the wiring harness to the head of the dispenser.
5. Test the handle switch for proper operation, and adjust as necessary (see
section 4.1 in this document).
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