there is only one bolt in the top of each secondary cylinder, the bottom just sits in a hole, the bottom of the cylinder is made to fit in the hole so once you get the cylinder retracted enough you can lift it out.
To get the cylinder to retract you will have to use the lift/lower lever and move it to lower and most likely will have to use a prybar or some other means to get the cylinder to drop, sometimes they will drop on thier own.

Now keep in mind, the carriage will want to drop down first, let it do so, once it bottoms out then the 2nd cylinder(s) will begin to lower. Sometimes the cylinder you remove the bolt from will drop down on its own, but in some cases you may have to help it. But once you get it lowered enough you then may lift it out of its slot and remove it.
It is extremely important that you have the mast blocked and chained and that you have raised it to enough height so allow movement and gain clearance to get this 2nd cylinder out. The reason the mast positioning is so important is the crossbars in the channels tend to get in the way because of the way the cylinder is oriented so you need it to be raised enough to retract the cylinder and then lift and move it around. Once you get to this point you will understand what i am saying.