The water will barley come out of the backwash when turned to back wash on Hayward sand filter
The first hint i would suggest is only turn selector in clockwise direction always.
not to insult but you must have pump off during selectiong.
Now, The ball valve sounds like it is out of alignment.
because of wear, from going back and forth not rotational.
you can check for alignment by checking to see if you have any flow coming out return nozzle into pool. There should be none during backwash.
pressing the handle down unlocks rotation, so if you are handy remove selector from top of filter, then check motion as you move selector. I have used o ring lubricant to lube parts in selector.
BEFORE DISSEMBLING NOTE POSITIONS OF BALL Inspect how the push down to rotate function.
If lubing is no help creating smooth rotation you may need to replace assembly.
Hayward Pool &...
on Jul 06, 2019