Samsung CLP 550 - Manual (Page 156)

M AINTAINING Y OUR P RINTER 6.26
10 Hold the handle on the new transfer belt and then align it
with the slots inside your printer, on each side.
N OTE : Keep the transfer belt level and do not turn the transfer
belt over otherwise loose toner may be spilled.
11 Slide the new transfer belt down into the printer and press
it firmly into place.