MP40 Grinding/Thumping

[LobsterOfJustice]

I have an MP40 with upgraded QD driver which was working great until a tank breakdown about a month ago. I went to use it last night and the unit is making a terrible grinding/thumping noise. After 30-60 seconds the noise gets worse and the wet side starts spinning in the tank. I can hear the motor ramping up/down even though the control is set to constant.

Looking for guidance on what parts to replace (driver, wet side, dry side) if possible to avoid replacing the entire unit.

 

[Breadman03]

Pull apart the wet side per the maintenance instructions and clean/inspect it thoroughly. I suspect that there's just some dried up junk impeding the impeller, though a swollen magnet is possible.

 

[LobsterOfJustice]

I have purchased a new wet side and I am still having issues.

Upon initial installation, the dry side was making a steady purring - not the normal operating noise, something a little louder with a steady thumping. I switched the control to constant (green) and turned up the flow - the pump ramped up, but after a few seconds turned itself down. The dial switched to yellow and the left and middle buttons as well as the dial became unresponsive. I could turn the unit on and off with the right button but it was still locked. I unplugged the unit and it reset. I switched back to green and turned the flow up - noise is actually sounding better now - but again, after about a minute the pump slows itself down, dial turns yellow and controls become unresponsive.