Tunze 6045 running backwards

[sharkie]

Hi Roger....

I just got my tunze 6045 from aquarium speciality and I have a problem with it running backwards. When I plug it in for the first time, it just continuously runs backwards. If I put my hand in front of the pump to cause of a little bit of a suction against my hand, it then runs forward.

Is there something I can do so that I can make it run properly? I have checked the impeller and made sure there was a little white disk at the bottom of the shaft. It is stuck to the bottom and not loose.

Thanks!

chiu

 

[univalreef]

Moving backward

Moving backward

Mine also moving backward; running once a while and when stop and restart e.g. feeding time. This happened consistently for the first 2 weeks.

It seems stop for now! The LFS/Dealer told me to let it run for a month and see if it will happen again

 

[rvitko]

As univalreef said, a week or two of running usually solves this. For the direction to reverse the prop has to fly down the shaft and hit a stop and fall back. New pumps are often too tight and the tight fit prevents the drive unit from coming down the shaft. It just takes a little wear to solve this problem.

 

[sharkie]

Hi Roger,

I let it run continuously for a while now and I decided to check this weekend by turning it off and on, and it still started running backwards. I tried a few times to get it to run forwards, but it would not do so until I put my had in front of the pump. Do you have any other suggestions?

Thanks!

chiu

 

[RTKBA308]

My 6045 runs forward, but my 6025 runs backwards:hmm3:.

If I turn off the 6025 to feed, when I turn it back on it turns backwards. If I turn off then on again, it runs forward again, PIA(pain in the as$)

 

[frydaddy]

my 6025's do the same thing. I have to either turn them off and back on quick or put my hand in front of them to get them to correct themselves. The annoyance factor has gone past their value. But I'll give them till the 2 month mark to "break in", if they don't I'm just going to toss them.

 

[chrisbenavides]

Do lots of people have problems with these Tunze pumps....

I am starting to get into higher-end equipment (now that I can afford it), and will consider a higher-end skimmer and powerhead. I believe Tunze is perfect...but will I expect a problem with the Turbelle nano stream 6045 that I order.

 

[twon8]

i haven't had a problem with any of my tunze products, i've got 2 6045's, one 6025, a 6200, three 6100's and a 6000.

 

[atvdave]

<a href=showthread.php?s=&postid=9677227#post9677227 target=_blank>Originally posted</a> by chrisbenavides
Do lots of people have problems with these Tunze pumps....

Not me . I have 2 6045's and they have always performed perfectly. They start out back wards just for a second and then hits the stopper and turn the right way.

I went with Tunze for the top of the line customer services. Roger will try to get the pump working right over the phone, or Internet. If it don't work he will replace it with no questions asked. Not many other company's will do that.

Just keep taking to Roger. He will make things right.

 

[rvitko]

If you have a pump that spins backwards follow the following procedures-

6025- check that shaft is in place and the disk is in place. The shaft should stay stuck in the pump - it is not removable. The disk is a plastic washer the diameter of a pencil eraser, if this was ground down by sand it needs to be replaced. If both of these are OK you likely have a prop assembly that has too tight of a fit I can send a replacement.

6045- some 6045's have too tight fitting of a drive unit. On the 6045 the disk could wear also and cause this but the shafts don't come out on these as we found the problem before any were made so the shafts are a tighter fit, you can ignore this step.

 

[jacmyoung]

If any of you are willing to do some simple mods on your 6025s or 6045s, you will be able to increase the flow to 1250gph, and never have the running backward problem again. Check out the Tunze Nano Mod thread. Should run the pumps continuously as designed to avoid warranty issue.

 

[sharkie]

Hi Roger,

How do I go about getting a new shaft for the pump? I am in Austin also, so I can bring the unit by for you to look. PM me the info.

Thanks!

chiu

 

[rvitko]

The shaft cannot be reliably replaced, the whole motor needs to be replaced. You can bring it by but I need to get some new motors in stock first. Next week I should be able to do this for you.

 

[sharkie]

Hi Roger,

Please PM when you have replacements, and I can come by.

Thanks!

chiu

 

[rvitko]

You have PM's turned off, I am sorry, I was confused, 6045's I have, but not 6025.

 

[sharkie]

Hi Roger,

I turned on PM. And I have sent you a PM.

chiu

 

[dga]

<a href=showthread.php?s=&postid=9685462#post9685462 target=_blank>Originally posted</a> by rvitko
The shaft cannot be reliably replaced, the whole motor needs to be replaced. You can bring it by but I need to get some new motors in stock first. Next week I should be able to do this for you.

well theres your problem, a design error. i have not seen a powerhead that has not had a impeller shaft wear after prolonged running. i still have a aquaclear 301 and 402 that have had several shaft replacements over several years, (chromed stainless steel) and continue to run flawlessly. i understand the impeller is of a different design than the propeller of the tunze, hydor, seio, and ,even maxi jet mod, however tunze is the only one where the shaft itself is not replaceable?

 

[jacmyoung]

<a href=showthread.php?s=&postid=9807089#post9807089 target=_blank>Originally posted</a> by dga
well theres your problem, a design error. i have not seen a powerhead that has not had a impeller shaft wear after prolonged running. i still have a aquaclear 301 and 402 that have had several shaft replacements over several years, (chromed stainless steel) and continue to run flawlessly. i understand the impeller is of a different design than the propeller of the tunze, hydor, seio, and ,even maxi jet mod, however tunze is the only one where the shaft itself is not replaceable?

How did you replace the shaft in a 402 powerhead? Glue it back in? It has the same design as the Nanostreams. The only way I thought is to replace the entire motor.

If you are talking about shaft design that allows it to be removed, like many other powerheads and the Hydor Koralia pumps, then yes they don't have the loose shaft issue. But Tunze had tested such design and the removable shaft can't be reliably centered in a powerful prop pump in the long run, if I understand correctly, because it will be held on one end with a thin plastic cover.

The Koralia pumps have a deliberately much smaller magnet drive assembly than the hole in the motor to tolerate the movement, as a result it needs a bigger motor (12W vs. Nanos 7W) to pump out the same 1200gph.

At least that is what I figured but I am not expert on this issue.

 

[rvitko]

Actually many pumps from Italy do not have removable shafts, this has been a standard design for quite a while.

 

[dga]

<a href=showthread.php?s=&postid=9807284#post9807284 target=_blank>Originally posted</a> by jacmyoung
How did you replace the shaft in a 402 powerhead? Glue it back in? It has the same design as the Nanostreams. The only way I thought is to replace the entire motor.



At least that is what I figured but I am not expert on this issue.

the 201 (now 20) 301 (now 30) and 401 (now 50) have a beefy molded insert into the bottom of the pump housing. i have been replacing these for years. they are set in firmly but can be removed. although the impeller design does not place near as much rotating torque within the cavity and on the shaft as the propeller design, so i can see how they need to be permanently installed, providing they can be manufactured to be just that...