Gradual but relatively sudden, was using it for longer tougher grass, as though belt driven with a loosened belt. works fine when little resistance. Must lift front sometimes to get blade to turn, almost like it is forming a seal when on the grass. Clear loss of power, tuned fine, great power to rear wheels....
SOURCE: Craftsman 18.5 briggs/str 42''won't cut
It sounds to me like a very loose belt or very worn out belt and also an adjustment problem.
SOURCE: blades are engaged,but won't cut the grass
Check the blades to make sure that they are not upside down
SOURCE: Craftsman 18.5 riding mower when I engage the
craftsman decks have a positive stop adjustment for the decks. A spring atached to the blade ingadgement arm pulls the tension pully into position if the cable is rusted inside the sleeve it wont put enough pull on the ingadgment pully and thus the blades dont spin full force the belts on the mowers have no adjustments only the pully . second thing is you may want to drop the deck and clean around that pully by scraping any rust off the surface under the pullys slide good luck
SOURCE: Blades won't spin on Craftsman II riding mower
get some one to sit on it and holding the brake try engaging the clutch...now with out getting to close laying down you can see if the linkage is working right....might just be a missed belt wheel.
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