another question about Nano Stream durability...

[flipteg]

when i made one of those MaxiJet mods a few months back, one durability issue that i saw was that the plastic on the magnet and the plastic on the bottom of the shaft was wearing out after only a few weeks of use due to the constant friction between the two surfaces and the force put on it by the propeller... the Nano Streams has exactly the same design, meaning it doesn't have anything (bearing, washer, etc.) to prevent the two plastics from wearing out...

i don't know how long the expectancy for these plastics are under normal and constant use, but after only a few weeks of use, there is already a noticeable wear on the plastic at the bottom of magnet... and seeing that the shaft is not really meant to be replaced, what would happen when the plastic at the bottom of the shaft wears completely off...?

i don't have any experience with the larger Streams, but i assume that there is some sort of bearing in them...

i ask the question about the durability issues because i got one of my Nano Streams back about 2 weeks ago from warranty repair of the loose shaft... today, i turned the pump off for the first time since i put it in the tank 2 weeks ago... it had trouble starting again... i unplugged and plugged it in repeatedly and it just would not start... looking at the propeller it moves, but barely... it doesn't even try to bounce at all... it just shakes a tiny bit... i took it apart, and the shaft is still firmly in place... then after taking it apart, i put it back together without doing anything... i plug it and strangely enough, it starts back up... i don't know why it doesn't start sometimes... the other pump that i sent in also did this before Roger replaced it... now it's this one...

 

[Malifluous]

Make sure the prop is centered. The best way to tell is to look at the space around the magnet when just the tip of the shaft is inside the impellor. Seems like your impellor is stuck. The impellor should spin freely. You should be able to spin it with your hand.

 

[rvitko]

The plastic at the bottom of the shaft is a replaceable part, it is in your manual. We used a similar design in all of our pump made prior to 2000 and the disk tended to last about 2 years. The new large Stream design has a bearing made of graphite, that is virtually indestructible but it wasn't feasible in such a compact design. There are some problems with the first pumps, they are caused by a loose fit of the drive unit in some pumps. There was too much variation is the diameter of the hole and on some drive units the hole is large and the drive unit wobbles and the hole gets larger and the bottom disk wears out. The tooling is all being redone to narrow down the tolerances. The pumps do have a 2 year warranty and if something comes up we will replace it. It was not our intent to have these problems, the prototypes were all trouble free, I still have the pumps we showed at MACNA and have had no issues with them, it was deviations in mass production that caused these problems.

 

[flipteg]

thanks for the info Roger... as long as i can replace the wearable parts in the future, it should be ok...