100, 
If its like the wide frame tractors. There is a flat spring like thing that hooks to that lever. They will get weak or crack and not push down like they should to release the valves.  But again these were only for a little push forward or reverse in the garage. Never very far. Just for your information NEVER EVER EVER tow one. Under its own power you will probly never have any trouble with a hydro. But towing them will distroy the hydro.
		 
		
		
		
		
		
		
		
		
	
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