Step son broke gears in PTO few years ago. Couldn't find correct tooth count so I used gears out of an 880, Just have to run at 880 PTO revs for 540 instead of 1555. Hadn't used PTO for a long while, went to use stalk chopper, backed up &amp; turned tractor off, hooked up, climbed up and started tractor. PTO was engaged even with lever in off position, and lever goes over center only with a LOT of force, maybe 80-100 pounds. Was working normally before with only 35-40 lbs needed and would shut off. Any ideas before I tear it apart. Really don't want it down for long, too handy a tractor. Sorry for long post, but more info yeilds better answers.