Question about Polaris 3900 Sport Pool Cleaner ()

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20 month old 3900 Polaris, Drive chain keeps slipping off of toothed sprocket. No teeth missing on sprocket. How do I keep chain from coming off?

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Check the float on the back of the machine. Mine was full of water. As soon as I replaced it , everything ran perfectly again.

I tried every possible 'obvious' solution, from new wheel bearings to a new chain tensioner-thingie. You will notice that there is actually relatively little room for the chain to slip off the drive gear.

Seems that this additional weight a) turns the float into a sink and b) provides enough drag to force chain slippage.

After replacing the float, everything runs perfectly again. Of course, our friends at Polaris have now decided that you cannot simply buy a new float. You have to buy the ENTIRE BACK, paying 90 bucks for something that should cost no more than 10 - 15! Scoundrels.

Posted on Jul 01, 2012

  • George Aug 22, 2013

    Just fixed my 3900 Polaris with the same problem of the chain coming of the middle sprocket. Mine is two years old. I fixed the problem by replacing the chain tensioner ($19:00). My old one showed a little wear along the inside of the wheels and was generally sloppy nthe new one lined up the chain to the sprocket by just a mm or two. The new tension kit spring is a little shorter than the original which gives the chain a tighter fit.



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SOURCE: hello. i have a

Defect in single side wheel. It strips out causing it to run in circles. Replace that wheel

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first check ur sprocket and see if ur teeth look skinny if so ur sprocket is probably bad or the chain is bad see if chain feels real loose between the individal links

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