Polaris 3900 Sportsman won't stay on the bottom

cecelia a said:

I just had new wheels, new sprocket, new chain put on. Now the cleaner starts off, then sort of takes off and just flies around, not staying on the bottom. I'm trying to avoid taking it back to the pool shop again.

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Be sure that you don't have a suction leak that is sending air to the cleaner.
Adjust the "thrust jet" at the back of the cleaner to face more downward to force the front of the cleaner down. See page 6 of the owner's manual.
Having a Polaris repaired at a store is no substitute for being on site and making the adjustments needed so it will work properly. The store is "guessing," an on-site tech can see what is needed.