Porter Cable 903373 Belt - Random Orbit

Got my sander working flawlessly again. I suggest keeping one of these handy as they break every 10 years or so. Don

Good price, took a couple weeks for delivery

It fit, it worked and does a great job.

Let me add my 5 star review to others. Worked a treat. Of course the old belt broke on the first piece of my project but a square sander did the trick. Not as well but it worked. Well pleased to get my go-to sander back.

Always a gamble restoring a 20 year old tool. Always a gamble purchasing repair parts that could have been laying around a hot warehouse or because of their age dry rotted and useless. Happily that was NOT the case with this. The random orbit function of my 333 porter cable sander stopped working. Taking it apart I found an old broken belt. FYI for those contemplating something similar. If you are going thru the motions, just get another Velcro sanding pad while youre at it and thank me later. Also check to see if the pulley spins easily (photo); mine was gummed up with sanding residue and wouldnt turn which is what caused my belt to burn up. (NOTE IT IS LEFT HAND THREAD- TURN TO THE RIGHT TO LOOSEN!!!). Otherwise your will strip out the cast aluminum housing. Put a dab of Dry Lube like Teflon or Graphite (not petroleum based) on the screw and bearing of this pulley. Restoration projects like rarely work out for me but this is a good, relatively old school random orbit with some weight and motion to it and was worth the chance. It is ALIVE now! Yay!

Perfect

I thought P.C. had this way over-priced for this item, but I needed it, it fits perfectly, and Im using my sander without any issues.

It works.

For orbital sander

This is a very stiff belt. Instead of transfering about half or so of the motor spin into random orbit action, it just sort of locks up and the sander spins up like a non-random orbit sander. If you turn it on and wait more than a couple seconds before appl7ing it to the board, it sands fast, but not smoothly. Not good.