What keeps making my K4s reverse direction?

[d3rryc]

Does anybody have any idea why my K4s keep reversing direction? They'll start up fine, and all is well for X amount of time. Then they'll spend the next hour chattering like crazy because the impeller keeps running backwards. I just threw one in a vinegar bath, but it won't shut up as the impeller keeps changing directions back and forth. What's the issue here?

[allan]

I wouldn't feel comfortable stating one way or another without actually getting my hands on your K4 to see what's going on... with a DVM in my hand of course.

Mine chatter when they first turn on sometimes before they get going. Direction is fine though.

If the chattering is continous and direction was indeed reversed I'd want to check polarity although I don't remember seeing a larger flange on either of the two plug slot things that imply polority is important.

Which leaves me with my own experieence of the chatter. I have a K1 or something that was chattering and not sending fluid forward. I took it apart. The impellor part has (on the back side) two little bumps that fit snugly into two little divets on the bushing/colar thingy. My color was rotating fine, but the bumpy/divity things were 'chattering' as one spun and the other did not. I took a drop of super glue gell and applied it to both divits and put the impellor onto the bushing thing. Then I put it back onto the shaft (I'm thinking that was permently affixed to either the impellor or the bushing). Put it back into operation and it worked for about two months before constant shutting off and on caused it to work again.

I repeated the steps above and so far no problem.

[tezr]

Check the shaft to make sure the impeller can both spin on it and move back and forth. It is made so that when moving in a reverse direction it will actually move the impeller out of the magnetic field so that it will catch on the detentes on the end to stop the reverse direction and then allowing it to settle back into the field while rotating in the correct direction.