TUNZE 6205 noisy after cleaning

[bullitr]

I clean one of my 6205 just to remove some debris on the grill all of a sudden it sound like a vortech ....
Both of my 6205 and 6305 remain quiet I don't understand why?
I switch the shaft thinking it was misaligned it's not, I clean the magnet and inside the motor but its still very noisy.
I have a silence kit on all of them.

What else can I do?
the last time this happen I have to send the unit out
And That was not too long ago!
Thank you


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[rvitko]

I would bet the front cover is not on all the way, carefully look at the seam where the two halves meet, likely one side isn't clicked in all the way. If you can get me your name I can look up the last repair and that might tell us what was wrong.

 

[bullitr]

Roger
Its under Lawrence Castor
I believe the very recent one I send out was the 2 TUNZE 6215 or maybe this one.

I make sure all of the sides are tighten and on the right place I even switch impeller shaft but its still humming sound like a vortech mp40w on a regular mode so I just turn it off.


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[bboudreaux]

i have never used a tunze ph before only koralia and now vortech. i do however use their ato, and it is great. i not trying to start anything here i just have never understood when people talk about vortechs being loud. i have a mp-10 and mp40 both are ecosmarts. my are very quiet. i must admit they are dialed back, but i usually turn them up shortly before i change filter socks just to stir things up a bit. i use the nutrient export mode at 90% for 15mins before changing filter socks. i don't notice them even running unless your head is about 8inches away. you must remember the vortechs motor is outside the tank, and the tunze is inside. the water can insulate from some sounds.

 

[rvitko]

I show in December we changed a propeller and this was because you had the older one without the silencing disk and titanium shaft. As to why it would be noisy now, I don't know. I would look at the following. The prop and magnet spin on the shaft, the prop and magnet can fuse to the shaft by calcium and drag in the rubber bushings. This will result in a squeal and vibration. Each end of the shaft should have light blue rubber bushings. On the bottom of the shaft under the magnet is a disk with a slit in it that faces up. On the newer drive units this disk has a darker blue silicon rubber cup underneath it. The slit acts like a miniature impeller and creates a flow to purge out debris and this is very important to low noise. In most case if all this checks out, a week or two of running the pump will quiet it down by purging small air pockets and things will vibrate and seat into the right positions over time.

 

[DNA]

I've got similar issues with my 6205 since I plugged it in new 5 days ago.
The noise is quite loud and it's like the neighbor is moving the lawn all day long.
If I place my hand in front of the outlet it will run silent for a few minutes, but the noise comes back, stays and it's really annoying.

I opened the cover and noticed right away how lose the magnet is in it's hole compared to the older Tunze stream pumps I've had for years where it sits really tightly. There is also this bizarre statement in the manual. "If the drive assembly is too loose and has to much clearance, replace the entire part". There are no spare parts in the package and this sounds like a comment meant for readers 10 years in the future, but with my new pump having a built in fault it may be relevant.

I've got the newer unit as you described it above and I checked the things you mentioned.
I also rolled the titanium shaft on a glass plate and it's very straight, but not perfect as I can see the end lift up a tiny bit on every rotation.

Now please advise how to fix this since sending it back will be costly and time consuming.

 

[rvitko]

The drive units should be changed every 2-4 years, they do wear out, the magnets lose power and this is why replacement is mentioned in the manual.

The older Tunze pumps had no shaft and were instead centered by a system of bushing and bearings, they fit tight as a result, and this reduced energy efficiency a 6200 used 60W, a 6205 uses 48W. This tight tolerance also meant calcium built up faster.

My guess is there is something wrong with the drive unit, if you don't want to send it back, I would try to take a drill bit one size bigger than the hole in the drive unit, just barely bigger, and widen the hole very slightly, what you describe sounds like the there is some burr or casting defect in the hole in the magnet and just clearing this will solve the problem. You aren't really trying to make the hole bigger so it is important to find a drill bit that will just barely scrape out some material and remove the burr or defect. You could also write the factory at info@tunze.com, they may be able to just send a new drive unit.

 

[bullitr]

The drive units should be changed every 2-4 years, they do wear out, the magnets lose power and this is why replacement is mentioned in the manual.

The older Tunze pumps had no shaft and were instead centered by a system of bushing and bearings, they fit tight as a result, and this reduced energy efficiency a 6200 used 60W, a 6205 uses 48W. This tight tolerance also meant calcium built up faster.

My guess is there is something wrong with the drive unit, if you don't want to send it back, I would try to take a drill bit one size bigger than the hole in the drive unit, just barely bigger, and widen the hole very slightly, what you describe sounds like the there is some burr or casting defect in the hole in the magnet and just clearing this will solve the problem. You aren't really trying to make the hole bigger so it is important to find a drill bit that will just barely scrape out some material and remove the burr or defect. You could also write the factory at info@tunze.com, they may be able to just send a new drive unit.

the unit is noisy for a few minutes after I turn it off for feeding and resume to quiet mode
Thanks Roger if the problem continue I will let you know


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[rvitko]

This sounds a lot like the disk is riding up on start up, something simple. Maybe the disk is somewhat stuck to the magnet?

 

[DNA]

Thanks for your answer and good advice. I was just about to execute this when the pump started to run quiet most of the time. Now it runs at acceptable levels unless it's slowed or stopped then it goes into loud mode again for quite a long time.

I'm going to wait for a week or two and see how things progress.
Still these pumps should arrive in perfect working order and stay that way.