How to operate tilt cab (Eurocargo 100e15)

Just a follow up to this post.

So I got the jack for the tilt cab, turned the key thing to the right and pumped away. Easy at first but then as the pump built pressure gradually harder, and then… nothing!

I was following this video https://youtu.be/GOy2bCK3D7Q and the cab lifts for him after just a few pumps, but for me I don’t hear any sound of locks disengaging and no movement. Checked for leaks and the fact I cab feel pressure build in the pump suggests to me there aren’t any. Is there something I’m missing? I don’t know if there is any safety mechanism or anything that would stop it lifting? I’m assuming its fully manual (battery is disconnected) so no sensors etc?

Thanks (again!)