"mmurph30" wrote in message
...
Had a new pump installed on my, sealed gas, hot water system. I've been
trying to balance the radiators. The pump has started vibrating on shut
off.
Is there any way of fixing this, without getting the plumber back.

Do you mean a gentle vibration as it turns off, or a frantic tear the place
apart hammering as the thing desperately pumps water that has nowhere to go
?