Somehow I reversed the flow of my Tunze's

[Spar]

I cleaned two of my Tunze 6125's last night and somehow in that process I reversed the flow... it now sucks in from the front and blows it out the sides. No clue why it is doing this... any ideas and how to fix it?

 

[rvitko]

All synchronous pumps spin clockwise or counterclockwise at random, prop pumps have to spin the right way to push water forward, unlike impeller pumps which work regardless of direction. This pump has a direction correction system that has somehow been defeated. When the prop spins backwards it should fly forward, hit some stop fins in the front housing and then fall back spinning the right way. Possibilities include:

1) Disk is in the wrong location, part 6065.792, should be at the base of the shaft, under the magnet, not in front of the propeller, if it is missing the pump may also spin backwards.

2) The propeller is broken, if the ends are broken off it will clear the stops and continue to spin backwards.

3) The prop and magnet are stuck to the shaft. They must be able to smoothly slide back and forth and spin.

 

[Spar]

Thanks for the response. I realized that one other pump (I have 4) was also running in reverse which was one that I hadn't taken out to be cleaned (so who knows how long it has been running backwards). The other two I ended up getting to work again by just unplugging and replugging, so hopefully they are good to go now. But the 3rd pump won't go back to normal.

The other 2 pumps that I cleaned/serviced had a lot of calcium stuck on the magnet and had caused the shaft to not spin freely inside the magnet. So I am leaning toward your #3 above as the cause. I will just remove both the 2 that I haven't cleaned yet and clean them both and put them back in to see if that helps.

Thanks again.