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I have my 18.5hp(31Q777) out of the mower to do a total gasket set. How do you remove the pulley on the bottom of the shaft for the drive.
 

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I had a similar problem, it was welded on, so I never took it off. Luckily there was enough room to put the bottom of the crankcase down and still be able to gut it.
 

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hit the crank/pulley with some penetrating oil. Screw in the old bolt, but not all the way. have someone hold up the engine by that pulley and you tap that bolt until it starts to come
 
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