M9540 tractor will not kill when I turn ignition switch off

[Jase]

I need some help on my Kubota M9540 that will not shut off when turning yhe ignition key off. I have replaced the solenoid cut off but it still won't shut off unless I push back on the kill switch on the side of the tractor? Has anyone else experienced this same problem. I wonder if my key ignition switch us bad? Safety fuse? Electrical short? Somebody even mentioned a time relay under the dash. I have a real problem with Kubota service and trained technicians that really know how to work on these tractors unlike JD. I am also having problems with the air conditioner running for a while then startung to squeal and slide the fan belt until you turn it off. Is this head pressure building up? This will be my second air conditioning compressor in 4 years, serious design flaw on these Kubotas and very expensive to fix. If anyone can offer advice or experienced these sames issues, I would appreciate your suggestions. Thx

 

[Bulldog]

I had the no shut off happen to my M9000. It was a small, I mean really small build up of carbon or something in the plug for the shut-off. Cleaned it good and it's worked fine ever since.

I'd suggest hooking some gauges to the a/c so you'll have some numbers to work with. That's a hard system to guess at and still fix it correctly.