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Service Instructions
Drive Assembly
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 plug 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 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 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 one plastic pin that fits into the hole 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
the pin. To reinstall the PC board, position the lower edge of the PC board so that the hole in the
PC board lines up with the plastic pin. Push the top of the PC board towards the valve. Align the
upper hole on left hand side of PC board with the pin and push in until the PC board snaps under
the middle latch, weave the power wire into the holders and reconnect the motor 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 plug for the power source.
Unweave the wire 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 back plate. If resistance is felt before latching, then notches are not fully engaged,
the piston rod is not in the hole, the power wire is 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 tilted towards
the bottom of the drive bracket. Before trying 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 of 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 reflective coating because dirt or oils may interfere with pulse counting.
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