I have a new holland GT18 with a koler command 18 hp with 48 inch deck with power flow bagger. The engine is horizontal with driveshaft to the tranny. The belt to the deck comes of the front of the the engine at the front of the tractor makes a 90 degree turn then heads to the deck. This belt just keeps getting tighter and tighter , i did find one problem a pully bearing was shot. Is this my only problem or is there somthing else making the belt get tighter. any help is welcome.