CHAIN COMING LOOSE
Check the float on the back of the machine. If that is full of water, it seems to provide enough drag to force the chain of the drive gear.
I have practically replaced the entire inside of my machine, and learned the hard way that the mechanics are pretty sound.
Note that Polaris appear to have adopted a "rip the customer off on spare parts" strategy. I had to purchase the entire 'redesigned' back for 90 bucks in order to replace a float that should have cost around 10-15 (IMHO) dollars.
SO ----
1) Check the float to confirm my theory. If the float is full of air, it's back to the drawing board. If not, carry on with the following instructions.
2) Lift the 'tail' of the polaris that clips the float in place
3) GENTLY try to pull the float out (newer models appear to have it screwed into place). If it comes out easily, carry on to step 5
4) If it does not come out, you will have to remove the entire back, and then unscrew the float.
5) Locate the collar that sticks out from the bottom of the float, and drill a small hole, into the middle of the collar, and through the float's wall
6) **** all the water out of the float
7) Fill the seam that joins the halves of the float together , AND the hole you drilled, with plumber's epoxy.
8) replace float
9) If necessary, replace the back of the polaris.
Hopefully you will get a few more summers out of your machine before having to replace the float altogether.
Good luck
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