Your printer will prompt you when the current belt unit is nearing the end of its service life. A faulty belt unit can lead to problems with paper feeding or print quality, so it is important to install a replacement as soon as possible. This genuine Brother BU330CL belt unit is designed for use with HL-L8260CDW, HL-L8360CDW, HL-L9310CDW, HL-L9310CDWT, DCP-L8410CDW, MFC-L8690CDW, MFC-L8900CDW, MFC-L9570CDW and MFC-L9570CDWT printers, and has a page yield of 50,000 pages at 1 page per job and 130,000 pages at 3 pages per job.