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Kubota Tractor - Engine doesn't turn off

Young I have Kubota Tractor which its engine will not turn off [taking key out, etc.]. What do I need to turn the engine off and not damage the engine ?
Any help would be appreciated.

T CORK Your tractor may have a blown fuse going to
the shutoff valve, if not the shutoff valve
could be dead. Check and replace.

J CARR I have G1700 model that sometimes has the same problem. To stop the engine look on the back left hand side of the engine (looking to front of the tractor) where there is a lever with a philips screw with red paint on it. It's next to the fuel manifold with 3 pipes going off to the injectors. Use the screw as a handle to move the lever and the engine stops. This is a manual operation of the fuel shut off which is normally actuated by a solenoid.

Mine only plays up occasionally and when the engine is first started. The assembly may just need a shot of WD40.

I would have thought a failure of power to the solenoid would actually cause the engine to not start, I assume that switching on the key opens the valve.
Good luck

Dennis I have 1986 L2250 Kubota tractor that engine will not turn off. The only way is putting my hand over the air intake which means takeing the side cover off each time what a pain.I would appreciate any advice. thanks
Peter I followed the advice re the comment by J Carr and this resolved the problem completely.
It seems that the solenoid plunger had gummed up with dust,so a quick clean,manual manipulation and a spray of WD 40 has cured the proble.
Thanks for the advice.

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