On the 300U IPTO the forward screw is for the PTO band, the rear screw is the brake/anti-creep band. Screwing in tightens the band in either case. My technique varies from the book a bit, but I don't have your problem at full load. With the engine off, back the adjustment screws out enough so the PTO shaft turns freely with the handle in any and all positions. Screw the forward, PTO band screw in while the handle is in the "OFF" position until the PTO shaft no longer turns freely, then back the screw out just a bit more than enough so that the PTO shaft turns freely again. Start the engine (the PTO shaft should be turning) and screw the rear (brake/anti-creep) screw in until the PTO shaft stops turning. If the engine loads up at all, you need to back the front screw out a bit more. Provided your PTO drive band isn't trashed, this should get your IPTO to work without slipping at full load. Remember the basic idea of this procedure is to get only one band to grip at a time - if they're fighting each other they'll wear out quickly. Good luck!
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