Tannin 5900e Installation & Startup Guide
Page 23
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Rev 062915
B. To Replace Powerhead
1. Remove the control valve back cover. Remove the three screws along the outer edge of the back plate and
remove the front cover. Disconnect the power supply and the circuit board signal wire from the motor and
feed them back through the control. Disconnect the optical sensor signal wire. Disconnect the meter signal
wire from circuit board and feedback through the control.
2. Remove screw and washer at drive yoke. Remove powerhead mounting screws. The entire powerhead
assembly will now lift off easily.
3. Put new powerhead on top of the valve. Be sure the 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).
4. Replace powerhead mounting screws. Replace screw and washer at drive yoke.
5. Reconnect meter signal, optical sensor, power supply, and circuit board signal wires.
6. Reinstall front cover and back cover.
C. To Replace Piston Assembly
1. Follow Steps A.1 through A.3.
2. Remove control valve back cover. Disconnect the meter signal wire from the meter.
3. Remove screw and washer at 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 as furnished and push piston into valve by means of the end plug. Twist drive
yoke carefully 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. Reconnect brine tube and drain line.
11. Return by-pass or inlet valving to normal service position. Water pressure should now be applied to the
Tannin filter, and any by-pass line shut off.
12. Replace the control valve back cover.
13. Follow Steps A.9 through A.13.
D. To Replace Seals and Spacers
1. Follow Steps A.1 through A.3.
2. Remove the control valve back cover. Disconnect the meter signal wire from the meter
3. Remove screw and washer at 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 and replace seals and spacers.
5. Take piston assembly and push piston into valve by means of the end plug. Twist yoke carefully in a
clockwise direction to properly align it with drive gear. Reinstall piston retaining plate screws.
