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Eradicator II AIF Systems
Installation, Operation,and
Maintenance Manual
Service Guide
Drive Assembly
Always unplug the system from the electrical outlet before performing service on the unit.
Remove the valve cover to access the drive assembly.
Disconnect the power source plug (black wire) from the PC board prior to disconnecting the motor or water meter
plugs from the PC board. The motor plug connects to the two-pin jack on the left-hand side of the PC board. The
power source plug connects to the four-pin jack. The four-pin jack is between the two-pin and three-pin jacks. The
water meter plug (gray wire) connects to the three-pin jack on the far right-hand side of the PC board.
The PC board can be removed separately from the drive bracket but it is not recommended. Do not attempt to remove
the display panel from the PC board. Handle the board by the edges. To remove the PC board from the drive bracket,
unplug the power, water meter and motor plugs from the PC board. Lift the middle latch along the top of the drive
bracket while pulling outward on the top of the PC board. The drive bracket has two plastic pins that fit into the holes
on the lower edge of the PC board. Once the PC board is tilted about 45° from the drive bracket it can be lifted off of
these pins. To reinstall the PC board, position the lower edge of the PC board so that the holes in the PC board line up
with the plastic pins. Push the top of the PC board towards the valve until it snaps under the middle latch, weave the
power and water meter wires into the holders and reconnect the motor, water meter and power plugs.
The drive bracket must be removed to access the drive cap assembly and pistons or the drive gear cover. It is not
necessary to remove the PC board from the drive bracket to remove the drive bracket. To remove the drive bracket
start by removing the plugs for the power source and the water meter. Unweave the wires from the side holders. Two
tabs on the top of the drive back plate hold the drive bracket in place. Simultaneously lift the two tabs and gently ease
the top of the drive bracket towards your body. The lower edge of the drive bracket has two notches that rest on the
drive back plate. Lift up and outward on the drive bracket to disengage the notches.
To reassemble seat the bottom of the drive bracket so the notches are engaged at the bottom of the drive back plate.
Push the top of the drive bracket towards the two latches. The drive bracket may have to be lifted slightly to let the
threaded piston rod pass through the hole in the drive bracket. Maintain a slight engaging force on top of the drive
bracket while deflecting the bracket slightly to the left by pressing on the side of the upper right corner. This helps the
drive gears mesh with the drive cap assembly. The drive bracket is properly seated when it snaps under the latches
on the drive back plate. If resistance is felt before latching, then notches are not fully engaged, the piston rod is not in
hole, the wires are jammed between the drive bracket and drive back plate, or the gear is not engaging the drive cap
assembly.
To inspect drive gears, the drive gear cover needs to be removed. The drive gear cover is held in place on the drive
bracket by three clips. The largest of the three clips is always orientated to the bottom of the drive bracket. Before try
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ing to remove the drive gear cover, the drive bracket must be removed from the drive back plate. The drive gear cover
can be removed from the drive bracket without removing the motor or the PC board. Simultaneously, push in and
down on the large clip at the bottom and the clip on the left-hand side of the drive bracket behind the PC board. Keep
your other fingers behind the drive gear cover so the drive gears do not drop on the ground.
Replace broken or damaged drive gears. Do not lubricate any of the gears. Avoid getting any foreign matter on the
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