SENTRY II 972SM Series, Руководство по эксплуатации и обслуживанию

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Service Instructions
Service Instructions
Drive Assembly -
Disassembly and Inspection:
Remove the valve cover to access the drive assembly.
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 circuit board from the drive bracket to
remove the drive bracket. Press and hold the REGEN button (approx. 6 seconds) until the
unit begins a regeneration cycle (this action will ensure that the threaded piston rod will not
interfere with the removal of the drive bracket and circuit board assembly.) Disconnect the
power source plug (4 pin, black cable) from the circuit board prior to disconnecting any
other plugs from the circuit board. Disconnect the water meter plug (3 pin, grey cable),
located on the far right side of the circuit board. 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 inspect the drive reduction 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. With the circuit board facing up,
push in and down on the large clip on the drive gear cover. Handle the cover and the gears
carefully so that the gears do not fall off of the pegs in the cover. 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 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 circuit board. Move the spring clip loop to the right and hold. Rotate the motor at least a
1⁄4 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.
Visually inspect the motor for free spinning and remaining brush life (visible through slots on
the size of the motor). Check the pinion gear for endplay. If the pinion gear is pushed tight
against the motor housing, eliminating endplay, slide it away from the housing so the end of
the shaft is flush with the end of the gear.
The circuit board can be removed separately from the drive bracket but it is not
recommended. Do not attempt to remove the display panel from the circuit board. Handle
the board by the edges. To remove the circuit board from the drive bracket, unplug the
power, water meter and motor plugs from the circuit board. Lift the middle latch along the
top of the drive bracket while pulling outward on the top of the circuit board. The drive
bracket has two plastic pins that fit into the holes on the lower edge of the circuit board.
Once the circuit board is tilted about 45° from the drive bracket it can be lifted off of these
pins. To reinstall the circuit board, position the lower edge of the circuit board so that the
holes in the circuit board line up with the plastic pins. Push the top of the circuit 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.