An axle assembly, including an axle shaft, annular member, hub, inner and outer hub bearings, abutment ring, first and second seals, and an air inlet port. The baler assembly may be configured to consolidate the biomass into one or more bales. The emission device and detection device operate while translating along a displacement axis, to take a plurality of acquisitions. It is possible to reproduce data without retry, even if data error is uncorrected when the data of an optical disc is reproduced at the next time.