"Always had a Hum/Buzz sound to it, louder than usual."

If it is louder than usual, but always had it, what is the usual you are comparing the hum or buzz to?

Hum and buzz are two different sounds as I describe their origins. Hum is good, buzz is bad, speaking of the main pump. Hum is a motor, buzz is pump cavitation.

My guess is the accumulator is not the source of the noise you perceive, but that's just a guess from far away. I'd be embarrassed to ask a supplier to take back a part I'd misdiagnosed, but putting myself in the role of the supplier, I might accept it as a cost of doing business. As the customer, my nature would be to chalk the cost of an unneeded replacement to educational expense. Might be worth it.

http://cleanflametrap.com/kjetvideo.mpg
--
Art Benstein near Baltimore

"The world is full of specialists that only think about one small aspect of a problem. To be a good systems engineer you have to look at the whole picture, all while keeping cost, service, and reliability in mind." - Paul Rako