Tunze 9011 Skimmer Motor Stuttering/Jerky Spinning

[Newms118]

I have the tunze 9011 skimmer bought through Amazon (sold by Champion Lighting and Co.) back in September of this year and i finally got around to filling up the tank and testing the unit. I have the skimmer sitting in my sump with the standpipe layout and the water is below the blue screw / air inlet. When i turn the skimmer on, the motor spins but its a stuttering/jerky motion. It never actually stays spinning. There is a slight trickle of water that comes out the top of the standpipe, but ZERO bubbles are produced, even if i open up the screw completely.

One thing I've noticed is that when i took apart the motor to examine the drive unit, based on the instructions there should be a bushing and attenuation disk ( parts 9011.740) inside. However for some reason i don't see any type of washer etc inside the motor. Its just the metal pin and the drive unit that rotates.

So is this a defective units or is there something I'm missing. Ive left it running for hours to see if this was the "breaking in" process but i don't believe this is normal.

Any suggestions or should i contact Amazon or Tunze to see if i can get a replacement.

 

[rvitko]

Part 9011.740 stays down in the pump, it would be at the base of the shaft. It would be odd that this is missing. What I suspect is your impeller is too big, we had some pumps come in with the European 50Hz impeller, this is too large and will not work on 60Hz. If the disk is their, we can just send the right size impeller and you should be all set.

 

[Newms118]

What disk are you referring to? The impeller doesn't seem like it's too big but I could be mistaken.

Here is a pic looking down into the motor. As you can see there doesn't appear to be any of those parts (9011.740)

Here is a pic of the drive in the motor, I don't see any other markings on it to determine if it's the wrong size

And the motor

 

[rvitko]

Yes, the disk is missing (9011.740) and the impeller is for 50Hz, I can tell by the indentations toward the end, the 60Hz blade is 20% shorter and ends at the point of these indentations, 60hz is 3600rpm vs 50hz 3000rpm so it is spinning 20% faster and the flow is the same when the impeller is 20% smaller. PM me your address and we will get both parts out Priority Mail.

 

[Newms118]

Yes, the disk is missing (9011.740) and the impeller is for 50Hz, I can tell by the indentations toward the end, the 60Hz blade is 20% shorter and ends at the point of these indentations, 60hz is 3600rpm vs 50hz 3000rpm so it is spinning 20% faster and the flow is the same when the impeller is 20% smaller. PM me your address and we will get both parts out Priority Mail.

Great, ill send you a PM with my address, thanks