Okay. It took me a while but finally I found some time to check my pump.
First thing after I remove plastic cover that covers the motor. Why there is no seal?
Next I found that the impeller wheel (that's how you call it I believe) was clogged with straws of grass
This is how much I pulled out
After I cleaned everything and put all the parts together I connect the pump back to the filter . Turn it on and still same noise
Then I decided to take it apart completely to replace the bearings.
Check the photos of what I've found out. Rusted bearing :!:
I expected Intex to make better product but it looks like they do not want the bearings to last long time.
I have ordered the bearings and they will arrive tomorrow.
Already removed the old bearings.
Will keep you updated.
Also short note on the bearings. They are 608Z bearings which are most of the time used in rollerskating or skateboarding. I called local skate shop stores but they do not have them in stock. I ordered mines from McMaster-Carr cause they delivered cheap next day:
http://www.mcmaster.com/#6661k12/=o15eph
But I found cheaper ones here:
http://www.vxb.com/page/bearings/PROD/sk8zz. I used to order from these guys before but now I need these ASAP so I decided to go with McMasterr-Carr
One more thing. All you guys who will like to replace their bearings too use my advice and use cordless drill to remove 3 long screws that hold the two bearing housings together. Screws head is very easy to get damaged and you won't be able to remove them.
What I did is I set up the cordless drill clutch at 10 and press really hard against the screw. Drill acted as it was a impact drill which remove the screws slowly and without damaging the head.