The PT does not filter all of the oil at once so I decided to modify the hydraulic tank to accomodate tank magnets. Here are the tank magnets purchased surplus:
Here is the magnet with the mounting plates I made:
Here is the hydraulic cover when it was removed:
Here is the cover after cutting holes for the magnets, filter cart inlet/outlet, and thermometer:
Here is the cover mounted on the tractor with the magnets installed:
As promised, here is a picture of one of the magnets after I believe about 50 hours of usage – surprising number of filings!