Something loose on a crank shaft or cutting shafts
I would be looking at failing bearings on the pulley shafts for the cutters
Testimonial: "Thanks, Bill. The blades/pulley shafts can be eliminated. The blades don't need to be engaged to year the ringing."
SOURCE: Where can I get free download manual for a Kubota Mower ZD21?
http://www.mckeelequipment.com/kubota-mowers.htm
SOURCE: Zero turn cub cadet Zero Force 50" cut stopped running while mowi
Hello,
I have an idea. Try to start it again. It should start right up. When it dies again, immediately crack the fuel filler cap, and listen for a vacuum. If you detect a vacuum, clean the cap well, and pay particular attention to the vent hole on the cap. If it is plugged, it will do just what you were seeing.
Hope that this helps!.
Best Regards,
--W/D--
SOURCE: my 21 HP diesel zero turn mower starts blowing black smoke
Looks like you've got a good idea on what makes diesels smoke, so I'm sure you know that black smoke is almost always from too much fuel for the air that's going in. So it can be too much fuel or too little air. If your filters are good, the next things to check are the fuel pressure and the injectors.
I know diesels, but I don't have any specific experience with lawn mowers (kubota?). Since it stalls eventually, it sounds like it's not a single cylinder (although not for sure) so I'd check injector pump first.
SOURCE: Craftsman 22hp 7500 zero turn mower 3years old.
Be careful - running ungoverned will quickly destroy the engine. Look at the carburetor throttle lever. There should be two linkages attached -- one from the manual throttle lever, another from the governor. The linkage to the governor is usually a spring. Perhaps that came off or broke, or a foreign object is wedged in there.
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