Hi Fehlerteufel,

Yes, that's the only thing that makes sense but we have bled the air nipples on each stage of the cylinder and there was no evidence of air, just a smooth stream of oil. I feel like there should be a main bleed valve or venting port on the top stage as the 3 "y" air bleeding nipples are only for the seals for each stage.

The pistons all extend ok and are fully synchronised. Temperature is ok always sitting around the 30 degrees celcius range and we have an air cooler installed for when the oil temp passes 38 degrees celcius.

It's doing my head in! Haha.