The lift cylinder(s) in a crane are structurally a very important part of the crane. The outriggers keep the crane level and elevated off the ground. Much like the outrigger the lift cylinder(s) support the boom and everything involved with the boom, like the load, jib, etc. The lift cylinders are integral part of the crane. The lift cylinders provide an upward force that counteracts the downward force of the boom, load, etc. The lift cylinder is basically an actuator that provides a force in unidirectional force in a unidirectional stroke. The stroke of the cylinder determines how much force the lift cylinder can place on the boom, i.e. how much angle the boom can be increased.