求翻译：用小扳手先卸出轮架两端的固定螺丝，将轮子装入，然后拧入螺丝将轮子固定；（第2代产品出厂时已安装好轮子，此步骤可省略）是什么意思？

Discharged with a small wrench first round both ends of the rack mounting screws, the wheel load, and then screwed into the screw fixed to the wheel; (2nd generation factory installed wheels, this step can be omitted)

Use a small wrench uninstall both ends of the wheel frame-screw and wheels will be loaded into, and then screwing screws wheels will be fixed; (second-generation products have been installed at factory wheels, this step may be omitted)

Dumps the pheel carrier both sides first with the small spanner the anchor screw, loads the wheel, then installs the screw to be fixed the wheel; (When 2nd generation of product exwork has installed good wheel, this step may abbreviate)

With a small wrench unloading wheel at each end of the first fixation screws, wheels mounted, then screwed into the screw to secure the wheels and (its 2nd generation of factory-installed wheels, this step can be omitted)

Draw off a fixed screw in both ends of wheel first with the small spanner, pack the wheel into, then twisted and entered the screw and fixed the wheel; (the 2nd generation of products have already installed the good wheel while dispatching from the factory, this step can be omitted)