I've seen this happen before on a Cesab when a technician put the wrong spec hydraulic oil in.
What's the first few numbers on the data plate so I can id the family type?
H2X ???
Ill have a look in the manual & see what the hydraulic pressure relief valve should open at.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.