taking apart a Mak-4

[hockey nut]

So oiling the fan didn't help? How old is the one making the noise? Before I used my older one I took apart the impellar assy and soaked it in vinegar to get rid of the calcium build up ( which was making a noise). When I did that I think the front magnet was exposed so you might be able to get at the rest of the pump that way. I think with mak 4s it seems to be hit or miss with a noisy unit. My new mak is very quiet. I might sell my 1 year old one for a $100 or keep it for a back up and just buy a new one.

I realy like the mak 4s and I am impressed at their preformance and low power consumtion.

I hope you can fix your problem. Keep us up to date on your progress.

Regards