Why does my compessor start pumping slow then speeds up

by Brian
(Louisiana)

It just started doing this. Sounds like it pumps slow and then speeds back up to normal speed. It does not always do it but the last few times I have noticed the sound of it and it sounds sick till it gets going.


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Bill says...

Brian, it could be many things.

The first thing I'd check, since it sounds as though it's starting under too much load, is the unloader valve.

Go to the valve page and click the link to the unloader valve. Make sure that this part of the compressor is working properly, and if so, then we'll need to look at what's increasing the load on start up. But first, check the unloader.

Bill

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