Jean, I got your e-mail but I have been super busy and have not yet got the manual in to the mail.  I will try to do it in the next couple weeks.  Using the PTO almost all equipment is designed and built for 540 rpm and that is PTo gear 1 on your tractor.  Using a different gear could possible lead to early failure of the gearbox on the implement.  So that being said I do not think you hurt anything but drop down to PTO gear 1 now.