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Pipet-Aid XP Pump and Wire Harness Replacement

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Pipet-Aid XP Pump and Wire Harness Replacement Instructions:

Pipet-Aid XP
Motor and Pump
Wire Harness with Switch & Terminals

view showing unit with nosepiece removed and the three screws holding the handle halves removed
unit shown with handle open
once the handle has been opened, disconnect the battery
unplug the pump connector from the old wire harness
Once the valve body slide is removed by sliding it towards the top of the handle, unscrew the valve body screw. Make sure the buttons do not fly off once they are spring loaded.
Once the valve body screw is removed, with one hand, hold in both the fill and empty buttons. With the other hand. lift both the valve body and pump from the unit.
After removing the pump/valve body, remove the microswitch actuator
remove wire harness and microswitch
labeled internal components of the Drummond Pipet-Aid XP
old wire harness compared to the new wire harness with the printed circuit board attached.
Positive connection on the board
new harness installed. note location of the red (+) wire from the pump (not shown) and the contact on the board.
New wire harness routing. Coil the excess wire leading from the board to the charging port and route excess under the port.
Wire harness installed and actuator switch installed. Note: the actuator switch may be gray, black, or blue. They are the same.
This photo shows the proper connection of the motor leads as they connect to the board. It is critical that the red positive lead connects to the positive lead on the board. It will be the black prong coming off the board towards the back of the handle. It will also be necessary to bend the two prongs slightly toward the valve body so all will fit when the top half of the handle is replaced. Place the other half of the handle onto the unit and screw the bottom screw and the front screw in place. Once complete, reconnect the battery. Use caution when replacing the battery. Do not touch the contacts backwards. Once installed, close the battery door and screw the door in place.

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