A large round baler includes a bale forming assembly and a chassis constructed as separate units which, when disconnected and displaced from each other either entirely at an interface between the units or by tilting one unit about a longitudinal axis at one side of the interface, permit one or more flexible endless baling elements to be mounted in place on the baling assembly. Cross beams, which extend between and interconnect the opposite side structures of the bale forming assembly are located such, that they do not obstruct the space required to slide the endless baling element(s) over the baling assembly and into engagement with the bale forming rolls. Mounting of the flexible endless baling element requires the removal of one or more baling element support rolls from opposite side structures of the baling assembly and/or from opposite arms of a tensioning assembly.