SENTRY II 972SM Series, Руководство по эксплуатации и обслуживанию

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Service Instructions
Drive Assembly - Reassembly:
If the drive gear cover was removed, reinstall it 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.
To reinstall the drive bracket, 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. Replace the motor if necessary. Do not lubricate the
motor or the gears. To reinstall the motor, move the spring clip loop to the right and hold.
Gently turn the motor while inserting so that the gear on the motor meshes with the gears
under the drive gear cover. Release the spring clip loop and continue to rotate the motor
until the motor housing engages the small plastic bulge inside the drive bracket motor
retainer. Reconnect the motor plug to the two-pronged jack on the lower left hand side of
the circuit board. If the motor will not easily engage with the drive gear when reinstalling, lift
and slightly rotate the motor before reinserting. Reconnect the power plug.
Replace the valve cover. After completing any valve maintenance, press and hold NEXT
and REGEN buttons for 3 seconds. This resets the electronics and establishes the service
piston position. The display should flash all wording, then flash the software version and
then reset the valve to the service position.
Drive Cap Assembly
The drive assembly must be removed to
access the drive cap assembly. The drive
cap assembly must be removed to access
the pistons. The drive cap assembly is
threaded into the control valve body and
sealed with an O-ring. To remove the drive
cap assembly use the special plastic wrench
(part number) or insert a ! ” to " ” flat blade
screwdriver into one of the slots around the
top two inches of the drive cap assembly so
it engages the notches molded into the drive
back plate around the top two inches of the
piston cavity. The notches are visible through
the holes. Lever the screwdriver so the drive
cap assembly turns counterclockwise. Once
loosened unscrew the drive cap assembly by
hand and pull straight out.