I'm working on a 613C speed reducer on an elevator that keeps leaking oil out of the breather while running.

[Robert M.]

I've already replaced the lip seals, wear shims, and the pressure relief valve, but it's still happening. Starting to think it might be something with pressure buildup or venting, but not 100% sure.

Has anyone dealt with a speed reducer breather leaking oil under load? What was the actual fix in your case?