Ken
I think HP have made better laser printers but not many, the LJ4 and LJ4+ are
workhorses and have given reliable service for more than 10 years.
I wasn't trying to sell you any parts, I don't sell parts. The delivery
assembly will fail in time, if the belt is broken then that is probably an
indication that the whole assembly is nearing end of life, that was the point I
was trying to make. 500,000 pages from a LJ4 can only be achieved if the fuser
and transfer rollers have been replaced at least twice during its life. The
printer is rated at 150,000 pages between maintenance kits (HP recommendation)
but can in some cases do more but not 500,000 pages.
You may find the belt at one of the many HP laser parts refurbishers, I suspect
they are having these belts made for them since HP no longer manufacture parts
for this printer. The belt is one of the items that is replaced during
refurbishment.
Good luck
Tony