How To Replace the Hayward Slide Valve Internal Shaft O-Ring


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The Hayward Filter Control Slide Piston Assembly, has four O-rings, three on the outside of the Assembly and 1 inside the assembly. To access this internal O-ring for maintenance or repair, you will have to partially disassemble the Assembly. This guide shows you how to access the Internal Shaft O-ring.

Click here to view Hayward slide valves.

Step by Step


Step 1

TURN POWER OFF - Make sure that power to the pump is turned OFF before you open up the Slide Valve.

Step 2

REMOVE BONNET NUT - Unscrew the Bonnet Nut counter-clockwise to free it from the Body Assembly.

Step 3

PULL OUT SHAFT ASSEMBLY - Pull straight up on the Handle to lift it and the Shaft Assembly out of the Body Assembly

Step 4

PULL OUT DRIVE PIN - The Drive Pin is in tight so you will have to punch it out most of the way with an awl or small punch. Put a board under the shaft to support the impact so you don't bend the shaft. After you have punched the Pin most of the way out, grab the other end with a pair of pliers and pull it out the rest of the way.

Click here to view the Hayward SP410X Slide Valve GOKIT

Step 5

SEPARATE HANDLE AND SHAFT ASSEMBLY FROM PISTON - The Handle and Shaft Assembly out of the Piston.

Step 6

SEPARATE HANDLE AND SHAFT FROM BONNET - Slide the Bonnet off the Shaft.

Step 7

LOCATE AND REMOVE O-RING - The small Shaft O-ring in located in a groove inside the Bottom end of the Bonnet. Use a toothpick to work the O-ring out of the groove and up out of the Bonnet.

Click here to view the Hayward SP410X Slide Valve GOKIT

Step 8

LUBRICATE 0-RING - Inspect the O-ring for wear or damage. Replace if necessary. Then lubricate the O-ring with a silicone or Teflon based lubricant as identified above.

Click here to view Magic Lube o ring lubricant.

Step 9

REPLACE O-RING - Place the O-ring back in the groove. This can be tricky. Use a small screwdriver to work the O-ring into the groove. To keep the O-ring from going pass the groove as you are placing it, slide the Shaft into the Bonnet up to the groove.

Step 10

SLIDE SHAFT INTO BONNET - Slide the Shaft and Handle the rest of the way into the Bonnet.

Step 11

SLIDE SHAFT INTO PISTON - Slide the Shaft and Handle into the Piston and rotate the Shaft so that the hole at the end of the Shaft lines up with the hole in the Piston.

Please click here to view Hayward slide valves.

Step 12

REPLACE DRIVE PIN - With the holes aligned, tap the Drive Pin partially into the Shaft to make sure it is aligned correctly. Then use an awl or small punch to insert the Pin the rest of the way. Be sure to support the shaft as shown so you don't bend it.

Step 13

REPLACE SHAFT ASSEMBLY - When you slide the Shaft Assembly back into the Valve Body Assembly, note the notch in the Body Assembly and the lug on the Bonnet. Ensure that these line up when you insert the Shaft Assembly.

Step 14

SECURE BONNET NUT - Screw the Bonnet Nut clockwise back onto the Body Assembly. Hand tighten.


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InyoPools Product Specialist  Posted: 5/20/2017 

Anonymous (drain filter) - No, you do not have to drain the filter before opening up the valve body. However, when you open up the valve, the filter will probably drain to a lower level because you have broken the pressure seal.

Anonymous  Posted: 5/19/2017 

Do you have to drain the filter before opening up the valve body?

Anonymous  Posted: 4/6/2017 


InyoPools Product Specialist  Posted: 8/1/2016 

MK - Something may be damaged in the Slide Valve Handle and Piston Assembly. Take the assembly out of the Valve Body Assembly to check it and the inner O-rings. See our guides on "How To Operate a Hayward Slide Valve" and "How To Replace the Hayward Slide Valve Handle and Piston Assembly".

 Posted: 7/29/2016 

The shaft will not rotate for the backwash. Is this something other than the O-rings?

 Posted: 8/25/2015 

good information. replacing the o rings solved my leaking backflush issue. pictures were very helpful.

InyoPools Product Specialist  Posted: 10/27/2014 

O-Ring sizes - Thank you for your feedback. I will add this information in the guide that addresses the external O-rings: "How To Maintain a Hayward Filter Control Slide Valve".

Anonymous  Posted: 10/24/2014 

the two thick o-rings are dif sizes.(smaller id bottom and larger ID in the middle?)The larger but smaller thickness ring on top.The bottom 2 rings are close in size.

Anonymous  Posted: 8/30/2014 

thanks great advice

 Posted: 6/2/2014 

Thank you for the very useful information. I got all the o rings replaced, but I couldn't figure out the little tiny one. That was very helpful. You are the only ones that have this much detailed info. Great job.