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Pin on flywheel that connects to crankshaft keeps shearing off

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If the flywheel key keeps shearing off, you may be putting it together wrong. I put the flywheel on first and then insert the flywheel key. The surface between the crankshaft and flywheel may be too polished from years of use. I put a little bit of valve grinding compound on the crankshaft where the flywheel is going to sit and then I use an air wrench to tighten the flywheel nut. HTH
Good Day.

Posted on Nov 18, 2009

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Shear pin broken on my mower how do I change it


take the tins of. take the nut that holds the flywheel on off and you will see the sheer key. if it is ok leave it alone. if it looks like the flywheel is not perfect with the crankshaft replace the key. it is some times hard to pop off but you can do it. go to you tube and watch a couple of videos on this process.

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Take the cover off the housing that covers the flywheel. The crank shaft comes up the middle of the flywheel and has a slot in the end. The slot has the woodruff key in it. The key fits in the slot on the flywheel. When you hit something with the blades the crankshaft stops and the flywheel keeps turning. This shears off the woodruff key or makes it move out of position and then the timing becomes out of spec. The motor wont start. You need to pull the flywheel off and replace the woodruff key. They key looks like a half moon piece of metal.

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Check the blade on the mower. Make sure it is tight and that the shear pin has not been broken. There is a shear pin on the crankshaft that keeps the blade from turning along with the nut that holds the blade on. designed to break off if you hit something with the blade. That is so it doesn't bend the crankshaft. Also make sure that the starter works and that the gear that turns the flywheel has not broken off a tooth.

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1 Answer

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It sounds as though you may have a sheared flywheel key. The keys are made of aluminum and shear easily if the flywheel is not tight. Remove top cover and flywheel retaining bolt/nut. Examine key for location with slot in crankshaft. If sheared, orient the flywheel slot and crankshaft slot so that a new key fits. Be sure flywheel and crankshaft mounting surfaces are clean and free of oil/grease. Tighten crankshaft retaining bolt/nut to 90 ft lbs. Flywheel posisition is maintained by friction between it and crankshaft.

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2 Answers

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When you the key this time, put the flywheel on first then the key but this time use a little grit between the flywheel and crankshaft. Something like grinding compound. It will keep the flywheel from moving plus make sure you torque down the flywheel nut good.
HTH
Good Day.

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2 Answers

I have a Cub Cadet cc4125 string trimmer not starting


need a little more information .. but look for the following .. take out the spark plug and look inside with a flashlight ... if the piston is moving with the rotation of the flywheel then you likely have a blown head gasket .. if there is no compression there wont be a load on the pull cord .. a cracked or damaged piston can also do this .. ... if the piston is not moving when you rotate the flywheel then you likely have a bad "shear key" sometimes called a "shear pin" .. thats usually a half moon shaped small metal part that keeps the flywheel locked rotationally to the crankshaft .. it is designed to shear off if there is an excessive sudden load on the engine .. the flywheel will then spin without turning the crankshaft .. the same thing will happen if you have broken the connecting rod .. (a rod failure is often preceded by lots of clatter from the engine) .. the head gasket or shear key are much more likely to be your problem .. if you cant see in the spark plug hole you might try using a straw to feel the piston motion .. its possible that without the spark plug in place the piston might move even with a bad shear pin .. because with no compression the piston will move freely .. if thats the case you can stop the piston motion with a wood dowell thru the spark plug hole .. if it moves in spite of your dowell resistance then consider the head gasket option ..

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1 Answer

Severed Shear Pin Poulan P35TN20SE


First and foremost check to see if the crankshaft was bent when you hit the culvert. Remove the spark plug, Tilt the mower on its side at a 45 degree angle and while someone slowly pulls the starter rope see if the shaft where the blade attachs wobbles. If it does then you will need to replace the crankshaft (which can be expensive in some models). If it isn't bent, then the shroud that covers the flywheel is removed along with the other parts in that area and a flywheel "knocker" is used to remove the flywheel. At this point the old key is visible and you can see if it is sheered or not, If it is, then reverse the directions just followed after replacing the flywheel key. Chances are 99% it isn't the key, but the crankshaft.

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