Question about Craftsman 675 Series 190cc 22" Briggs Stratton Rear Bag Front Propelled Lawn Mower ()

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The shaft that the blade goes on to is bent. How do I seperate it from te crankshaft?

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The shaft that the blade attaches to IS the crankshaft. You might be able to find a shop that is willing to straighten the shaft, but it is somewhat expensive. At my shop that repair would be $120 to $150. Most shops would not be willing to straighten a crankshaft and would only recommend to replace the shaft....probably a $200 to $225 repair. Sorry.

Posted on Sep 13, 2010


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If you sharpened the blade recently try rebalancing it.
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1 Answer

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Sounds as if the mower has run over a large rock prior to what you are describing, you have a definate sheered pin on the crankshaft, causing the smoke(completely out of time).
You need to take the top off the engine 2 or 4 philip screws on the top plastic shroud, the pull chord assembly removing the pull chord as one unit, 3 philip screws need to be unscrewed or 3 rivets need to be drilled out to unfasten this assembly, after this is complete you will remove the 3/4" nut that holds the "flywheel" securely to the main shaft(crankshaft) with a small hammer and the 3/4 nut lightly threaded on the shaft take a block of wood and lightly tap it this action releases the flywheel from the you now see the woodruff pin sheared off in the machined groove on the shaft? replace that pin(shear pin,woodruff pin many names for the same part) take the old one to Ace Hardware or the like and get a new one, while it is apart and the plug of course is removed for safety sake of no start while working on it... turn the blade observe from the under carriage to see if the shaft is bent if it is I dont recommend repairing it replace the mower its an expensive job, if the shaft is ok sometimes the blade gets bent...replace the blade, Ace should have this as well bring old blade along when you go for the pin.
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if you bent the blade most likely you bent the crankshaft too.
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check the spark plug for spark if you have none then a flywheel key is sheered a more in depth fix.
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