it is just (wild) grass part of it is a old feald so that is the ruffest. (I have used a JD LT155 before but I was gonna do it with my 420 because it is a nicer tractor.)How rough is the area to be mowed? Do you expect to fly across the ground bouncing across the terrain?
Put a blunt point on an air chisel and vibrate it It will help the penetrating oil get in. What type of puller are you using?It could take a few more weeks, keep bathing it (daily application), try it place some cloth in the key way so it doesn't run out the bottom of the clutch. It could be really rusted on (30+ years) so that is why yearly maintenance has to include the clutches also.