My hayward navigator pool sweep does not move. we have replaced feet and flaps. . . . .

It could be that you have improper water flow. Use the water flow gauge and adjust the flow if necessary. It could also be a steering failure. Check the pool cleaners rear screen and clean it if necessary. Make sure that the cone gear is free and rotates smoothly in both directions. You could also need to replace the gear box.

Below is the instruction manual for these pool cleaners. There are diagrams and detailed instructions included in the manual. You should be able to find your answers there.

http://www.backyardcitypools.com/automatic-pool-cleaners/HAY-NAV950.htm

Make sure to keep the leaf canister and pump basket clear. Another thing to check is; make sure the screws that hold on the pods(the "flippers" on the sides) are Really tight. Those need to be cranked down pretty hard to ensure that they can move the cleaner along.
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You might need to replace the shoes or the wings. With these automatic pool cleaners, you often have to replace the wings. It is not a hard or expensive thing to do. You will just need to order the replacement parts from Hayward or an autorized dealer.

You may need to replace the pads on the flippers. You can get new 'feet' for your cleaner at any dealer . They just pull off and press on, They go on only one way so check the tabs before you press them on.

Please Vote !

It wouldn't hurt to replace the pods (paddles). Also, the wings, flaps, A-frame, turbine, feet(shoes) and the gearbox. All of these things wear and should be done about every 12-18 months, as needed. Before you do any of this, though, try tightening the screw on the pod that's not working. These screws need to be very tight.
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Too much suction pressure, rubber feet worn, or springs have popped out of feet

I have had the same Navigator for many, many years. I have replaced it's guts, pods, feet and gears whenever things wear out. I have a vinyl pool and it works great. I had a problem with it charging into the wall and just sit there beating it's feet ..... now this was my solution, and I'm surprised that Navigator has not altered the design to deal with getting stuck against a wall. This will sound CRAZY but it works great!! Take a plastic lid for a 5 gallon bucket and cut out a round-nose for the front of your navigator. The curved shape is prefect and you can notch the plastic lid and it will snug right into the Navigator body. This gives your Navigator a round-nose and it will never get stuck against a wall again.

Make sure the feet have springs in place, move freely, and rubber not too worn. If that all looks ok, then probably too much suction pressure. Use gauge that came with unit to verify proper suction.