Atlas copco GA5 oil leaking from intake during loading (a lot!)

Questions & AnswersCategory: Air Compresser TroubleshootingAtlas copco GA5 oil leaking from intake during loading (a lot!)
jaras asked 1 year ago

Hi there,

Got a problem with an old GA5. After about 1 minute after compressor running in loading mode oil starts to leak out from the air intake. Looking in to air intake (i have air filter housing off), i can see oil level raising while compressor is loading until oil reaches intake valve hole, and then starts leaking out. it is a lot – i get probably 50ml or so in five minutes of compressor running. Oil looks quite foamy when leaking out, i use shell corena. I also noticed, that when compressor switches to unloading before the shutdown, it pumps air out from the air intake.

I thought maybe oil separator element is blocked, but tried to run compressor with it removed today, and still have same problem.

Any help would be appreciated!


1 Answers
Cas Staff answered 1 year ago

Hi Jaras,

I’m not sure what is happening here… it could just be excessive foaming? But that would normally not happen. Did you change oil brands recently? I know it can happen if you mix two types of compressor oil that are not compatible. And I’ve seen strange oil problems once on a chemical plant where chemicals in the air reacted with the oil.

Maybe there’s a blockage at the screw element outlet? How is the outlet pressure and flow? Normal?