3Z355G has loud knocking noise

by Jerry
(Belton, SC)

My compressor from time to time will start making a loud knocking sound like metal hitting metal. It does build pressure & fills the tank but I would like to do a very minimal rebuild on the compressor. Can't find any rebuild kits/parts or rebuild manual. What can you suggest the problem may be & how can I fix it. Thanks!

Comments for 3Z355G has loud knocking noise

Click here to add your own comments

May 04, 2018
3Z355G pump cracked
by: Bill

Ouch! A full rebuild or did you junk it?

May 04, 2018
3Z355G Loud banging noise
by: Anonymous

I had that happen to my compressor. The screws for the pump valve came off, fell into the cylinder, and then pushed up and cracked my compressor pump head.

Aug 12, 2017
compressor knocking...
by: Doug in s.d.ca.

Could be the pump.

But (and I'm guessing here it's a pump driven by a belt) check that the belt tension is OK, and that the sheaves are tight on their shafts. Not to mention the pump and motor secured.

Click here to add your own comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Speedaire Compresspor Issues.