Hello I would love to know if it's possible to remove the pneumatic function from the chair, I always keep it at the lowest and I don't need to go up and down.
However, the chair keeps going up.
I prefer it to have stuck and don't move
Actually it is a pneumatic function, as the cylinder uses a gas, which compresses when you lower the chair.
There is actually two cylinders, a nitrogen gas spring, and a cylinder with a valve that allows gas to enter/exit.
When you lower the chair, gas escapes, when you raise it, the nitrogen spring lifts the chair drawing air in.
This wouldn't work as a passive hydraulic system because hydraulic fluid isn't compressible.
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It sounds like you have a leaky check valve in the top of your cylinder. Drilling a small hole in the bottom would do the trick, but you'll have to be careful due to the pressure on the compressed inner cylinder. For best results, extend the cylinder as far as possible before venting it.