How To Repair A Zodiac G3 Pool Cleaner (Diaphragm)


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The Zodiac G3 is a popular cleaner with few moving parts. The diaphragm is the most common to be replaced. This guide will show you how to replace it.

Click here to view the Zodiac G3 diaphragm.

Step by Step


Step 1

Turn of the pool pump and remove the hoses from the cleaner. Let the cleaner sit on the pool deck so that all of the water drains out.

Step 2

Unscrew the cassette handnut.

Click here to view the cassette with handnut.

Step 3

Next, you can remove the cassette chamber from the main body.

Step 4

The diaphragm is located at the bottom of the assembly.

Click here to view the Zodiac G3 diaphragm.

Step 5

Unscrew the cassette assembly.

Step 6

You will now have access to the inner pipe connected to the diaphragm.

Click here to view the inner pipe. 

Step 7

Push the inner pipe into the cassette chamber to expose the diaphragm. Make sure that the compression ring does not fall out.

Click here to view the compression ring.

Step 8

Remove the diaphragm by lightly pulling it off of the inner pipe.

Step 9

Install the new diaphragm onto the inner pipe.

Step 10

Insert the inner pipe into the cassette. Make sure that the compression ring is installed.

Click here to view the Zodiac G3 diaphragm.

Step 11

Once the inner pipe assembly is installed, screw the cassette assembly back together.

Step 12

Next screw the handnut back onto the main body.

Step 13

You have now successfully replaced the diaphragm. You can re-connect the hoses and take it for a test run.

Click here to view the Zodiac G3 diaphragm.


(1 to 9 of 9)

Anonymous  Posted: 6/30/2020 

Where does the flow gauge go ?

InyoPools Product Specialist  Posted: 8/27/2020 

If you mean the flow keeper valve, reference page 5 on this installation manual to see how to install it. Baracuda G3 Owners Manual 

InyoPools Product Specialist  Posted: 9/19/2017 

Dan - I'd take the diaphragm out again and reassemble it and compare each step to the pictures. Push the diaphragm is as far as you can the compression ring should define how far out it is. If this doesn't correct your problem, check your suction hose segments for leaks.

 Posted: 9/16/2017 

I have good suction (measured with meter) and no blockages, but the cleaner won't move. I'm not sure the diaphragm is seated right. When disassembling it looked crocked at the lip. Not sure how far in to push it, should it seat flush or back about 1/2 inch? No holds that I saw in diaphragm (which is usually my problem). How should the diaphragm look when inserted? Any other causes of not moving?

InyoPools Product Specialist  Posted: 7/10/2017 

Neo - It sounds like you might have debris restricting the diaphragm or you need to increase the flow to your cleaner. Using this guide, remove the cleaner's diaphragm and check it for damage or obstruction. For water flow adjustments, see the Zodiac G3 Owner's, Manual. See sections for the Flowkeeper Valve and Pool Pulse as applicable.

 Posted: 7/9/2017 

How often should you replace this? I have a G3 that moves across the bottom of the pool but does not go up the sides of the pool

 Posted: 1/30/2017 

Thanks, this helped me out a ton!

InyoPools Product Specialist  Posted: 5/20/2016 

Zodiac G3 Nut - The handnut on the cassette portion of the cleaner should screw off in a counter-clockwise direction. It may be corroded shut. Try tapping around the handnut gently with the handle end of a screwdriver or try soaking it in TSP solution.

Anonymous  Posted: 5/18/2016 

I can not get the casset to unscrew.