I have a Kabota BX25 compact tractor that I bought used a couple years ago. I've not had a single issue until I decided to remove my backhoe and mount up a tiller. I'm having trouble getting the pto to engage/disengage. The handle is froze in place, very stuck with no movement at all. I removed the tire and dug out some dirt and rocks then sprayed lubricant on it. Is there some sort of interlock? I've read the manual and followed it to engage it but no luck. Is it possible the lever is rusted/froze? The backhoe was on it for several years without the pto lever ever moving, any help would be greatly appreciated thanks