How can I shorten the chain on a Polaris 3900 pool sweep

Make sure that the feed hose floats are properly attached and spaced. Make sure that the opening at the end of the sweep hose is not blocked. You might also need to adjust the power to the pool cleaners sweep hose. To adjust the motion, turn off the booster pump and turn the sweep jet clockwise to increase motion.

The hose connected on the interior of the polaris could be disconnected. seperate the housing and you will see the hose. Or you need more pressure at the wall. Try closing are reducing the amount of flow to the skimmers to up the flow at the wall connection. Your back up valve should pull the polaris off the steps. Set the rotating jet propulsion on rear to 11: 00 position.

The Pool Tech