push mower blade keeps falling off

exotion said:
Ya locktite and thread lock will work.... But you should not have to use it. So there is something wrong and personally I would never do anything to a Sharp blade spinning at 3000+ rpm besides what the original engineers did they have safety standards far surpassing our own so replace the hardward your probably looking at $20-$30 dollars max how much is your foot worth?
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I threadlocked a 17HP riding mower blade about three years ago, no problems as of yet. If my 17HP didn't throw the blade I doubt this 3.5 will.
 
Loctite or new hardware. I will say price wise they would be about the same. Loctite isn't cheap. OK why would the bolt keep coming loose? What will new hardware solve? Bad threads, bad lock washer, improper torque? What are the threads like in the crank shaft? I would say there has to be a reason so find the problem??? If the threads are bad and you use a new bolt/nut, also use the blue Loctite to take up the worn threads on the crankshaft. For some reason everybody thinks just install new parts and problem solved, but that isn't always true. Like said earlier you have a blade spinning 3000 RPM's so fix it right.
 
check to see if theres any dirt in the bttom of the hole causing the bolt to bottom out not allowing it to be tightened properly. pipe thread tape also works good to hold a nut/bolt in place.
 
I would check for a partially sheared flywheel key. If the engine has back fired lately or had the starter roe yanked out of you hand, the timing might be off causing the problem.
 
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