koxician

I have a issue with the T2 Road Warrior. I cannot seem to lit the chair either up nor down. I was fairly sure I removed the red cap but decided to double check and no red cap is there. I decided to do a test of the lift and it seems to be pressing down the gas-lift but nothing happends. Do I have to remove the pin below the gas-lift (see picture below)? Or you figure it would be better to try and de and attach the gas cylinder again?