20
Removing
Power Head Removing Seal from
Valve Body
Piston
Back Plate
Seal Hook to Remove Seals
Seal
FIGURE 14 FIGURE 15
8. Using the puller, remove the first spacer.
9. Alternately remove the remaining seals and spacers in
accordance with steps #7 and 8.
10. The last or end spacer does not have any holes for the
pins of the puller to engage, therefore if the end spacer
does not come out on the first try, try again using the seal
hook.
11. With your thumb press the button on the brass sleeve
end of the stuffer and hold. Place the end spacer on the
male end of the stuffer with the lip on end spacer facing
the stuffer and push the stuffer into the valve body bore
until it bottoms. While the tool is in the valve body, take
a piston seal and press it into the inside diameter of the
exposed brass female end.
12. Remove the tool, turn it end for end and insert it into the
valve body bore until it bottoms, then push the center
button to push seal out of the stuffer and leave it in place
in the valve body.
13. Remove the stuffer from the valve body, turn it end for
end and push the center on the brass female end to
expose the pilot on male end and hold. Place a spacer
on the pilot and insert the spacer and stuffer into the
valve body.
14. While the stuffer is still in the valve, press another seal into
the inside diameter of the exposed brass female end.
15. Remove the tool, turn it end for end, and insert it into the
valve body bore.
16. Alternately repeat steps 13 through 15 until all seals and
spacers have been pushed into the valve.
17. Lubricate the piston and piston seals with silicone lubricant.
18. Start the piston into the valve body and slowly push the
piston assembly with end plug into the valve body. Push
piston rod in all the way, leaving only the connecting hole
end without teflon coating exposed.
19. Place two capscrews through holes in backplate, align
with female threads in valve body and turn capscrews a
couple turns to support powerhead assembly. Do not
completely tighten screws until connecting link pin is
installed. Caution: Be careful not to scratch exposed
piston rod.
Replacing Seal Kit 1. To replace seal kit, the follow special tools are needed.
A. Seal Hook: Used to remove piston seals.
• Wire hook with finger loop
B. Puller: Used to remove piston spacers.
• Has 3 retractable pins retained by a rubber ring at
one end. They are retracted or pushed out by
pulling or pushing the center button on the
opposite end.
C. Stuffer: Used to install rubber seals and plastic spacers.
• Double-purpose tool with brass sleeve on one
end.
2. Place Iron Curtain System on bypass. (Close inlet and
outlet valves and open bypass valve.) See Figures 1, 2
& 3 on page 8.
3. Relieve pressure by manually advancing timer to back-
wash position (See page 10). Unplug control valve after
valve is shifted into backwash position (piston all the way
in) and piston has stopped moving. After pressure is
relieved, proceed.
4. With a 5/8" wrench
• Loosen fitting nuts on back of air recharge valve and
air bleedoff valves (3/8" white and black polytubing
connecting the control valve to aeration head) and
disconnect tubings from air recharge and air bleedoff
valves.
• Loosen remaining fitting nut on air bleedoff valve and
disconnect tubing. (3/8" black polytubing connecting
air bleedoff valve to drain fitting.)
5. Remove the two capscrews holding powerhead backplate
to valve body and remove the powerhead and piston
assemblies. CAUTION: Be careful not to scratch the
exposed piston rod. Note: Some piston seals and/or
spacers may come out of the valve body with the piston
assembly.
6. Remove connecting link pin that connects piston rod to
the connecting link on drive cam assembly and remove
piston assembly.
7. Using the seal hook, remove the first seal.