Yesterday my John Deere 145 Automatic PTO stopped engaging the blades.  The first time they took a few seconds to rev up and then the same thing again and haven't engaged since............anyone with any ideas on a fix or a place to start?  Battery tests good. I only saw one fuse, a 20 amp, it was good and I don't guess there is another one just for the PTO.  Thanks 
keith
	
		
			
		
		
	
			
			keith