No reverse My Jet Vac was not backing out of corners. My pool cleaning man put a new set of gears into the pool sweep and it still does not reverse as it should. It will simply stop after about two minutes and not reverse at all for two cycles. On the third (short cycle) it will reverse, but only for about a foot and go right back into the same corner. My question is: IS THERE A SPECIFIC ORDER OR PATTERN FOR INSTALLING THE GEARS SO THE CLEANER STAYS ON THE PROPER CYCLE? Apparently he simply removed the old gears and dropped in the new ones without thinking of alignment. Any help would be GREATLY appreciated. I have same problem....It gets stuck in corner and will not come out! I took it apart and examined the gears and impeller, no signs of wear on the teeth or the center hole (no play). It seems that it doesnt matter about the allignment because all the water valve openings are only from the bottom gear. It allows water to pass from one opening to another. Could it be that I have too much or not enough pressure going into the vac? The output of water seems as normal as ever....hmmmm HELP!