Tahoe T../MA-BTB series, Installer Manual

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SERVICE INSTRUCTIONS
DRIVE ASSEMBLY
Remove the valve cover to access the drive assembly by pulling out slightly on the two tabs centered on the
side.
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 with thumbs and gently ease the top of the drive bracket forward using the finger tabs on the
upper corners of the bracket. 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. Pressing to the left 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 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 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 reflective coating because dirt or oils may interfere with pulse counting.
The drive gear cover only fits on one way, with the large clip orientated towards the bottom. If all three clips
are outside of the gear shroud on the drive bracket the drive gear cover slips easily into place.
The drive bracket does not need to be removed from the drive plate if the motor needs to be removed. To
remove the motor, disconnect the power and motor plugs from the jacks on the PC board. Move the spring
clip loop to the right and hold. Rotate the motor at least a ˘ turn in either direction before gently pulling
on the wire connectors to remove the motor. Pulling directly on the wires without rotating the motor may
break the wires off the motor.
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Replace the motor if necessary. Do not lubricate the motor or the gears. When reinstalling the motor gently
turn the motor while inserting so that the gear on the motor meshes with the gears under the drive gear cover
and the small plastic bulge engages one of the slots on the motor housing. Reconnect the motor plug to the
two pronged jack on the lower left hand side of the PC board. If motor will not easily engage with drive gear
when reinstalling, lift and slightly rotate motor before reinserting.
Replace the valve cover. After completing any valve maintenance, press and hold NEXT and REGEN
buttons for 3 seconds or unplug power source jack (black wire) and plug back in. This resets the electronics