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Service Instructions / Instructional Videos Available at www.csiwater.com
E. To Replace Piston Assembly
1. Follow steps A1 - A3
2. Remove control valve cover. Disconnect the meter signal wire from the meter.
3. Remove screw and washer at piston drive yoke. Remove powerhead mounting screws. The entire
powerhead assembly will now lift off easily.
4. Remove piston retaining plate screws.
5. Pull upward on end of piston yoke until assembly is out of valve.
6. Inspect the inside of the valve to make sure that all spacers and seals are in place, and that there is no
foreign matter that would interfere with the valve operation.
7. Take new piston assembly and push piston into valve by means of the end plug. Twist drive yoke care
fully in a clockwise direction to properly align it with drive gear. Reinstall piston retaining plate screws.
8. Place powerhead on top of valve. Be sure drive pin on main gear engages slot in drive yoke (wide side
of drive yoke upright must face to the left away from the motor).
9. Replace powerhead mounting screws. Replace screw and washer at drive yoke.
10. Follow steps D9 - D14.
F. To Replace Seals and Spacers
1. Follow steps A1 - A3.
2. Remove the control top cover. Disconnect the meter signal wire from the meter.
3. Remove screw and washer at piston drive yoke. Remove powerhead mounting screws. The entire
powerhead assembly will now lift off easily. Remove piston retaining plate screws.
4. Pull upward on end of piston rod yoke until assembly is out of valve. Remove seals and spacers.
(Note: Special end spacer must be reused)
5. Lubricate new seals with silicone lubricant included in the seal and spacer kit. Make sure the special
end spacer is properly seated in the valve body. Install new seals and spacers individually, pressing
around the outer edge of each seal to make sure it is seated. (When all seals and spacers are seated
properly, you will have a 1/4” of space between the top seal the the top of the valve body)
6. Follow Steps E7 - E10.
G. To Replace Meter
1. Follow steps A1 - A3
2. Remove two screws and clips at bypass valve or yoke. Pull softener tank away from plumbing
connections.
3. Remove meter cable from meter.
4. Remove two screws and clips at meter and pull the meter out of the control valve.
5. Apply silicone lubricant to O rings on new meter.
6. Attach meter to control valve. Note: meter portion of module must be assembled on valve outlet. Install
two screws and clips.
7. Plug meter cable into new meter.
8. Attach two clips and screws at bypass valve or yoke. Be sure clip legs are firmly engaged with lugs.
9. Follow steps D9 - D14.
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