I have a Polaris PB4 booster pump that's not working. I am able to manually rotate the shaft and have replaced the capacitor, but it still only hums when I try to turn it on. I would like to bring it into the shop to get it checked out. Problem is, I'm not sure how to disconnect it. While my main pump is connected with compression fittings, the plumbing that connects to the booster pump is sealed with what I assume to be joint compound.
I'd appreciate any suggestions on how to proceed.