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Hello,I have a 93 kawasaki klf400b1 4x4,im looking for a key pin(shear pin ) or half moon key? not sure what its calld but it goes in the crankshaft&flywheel to keep flywheel from spinning.cant find it on any diagrams
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The flywheel key has likely sheared. Contemporary utility 2-cycle flywheel keys are integrated into the flywheel. A new flywheel will be likely be required.
Called the Woodruff, or Half Moon Key. All parts are obsolete. Go to a good tool shop and see if they have an assorted box of them.
Woodruff key (Part #56)
Part #STD580025
The manufacturer no longer makes this part, and there's no substitute part
There are Craftsman Woodruff keys available online. They come in two types. The key is there to locate the pulley and shear if strain exceeds specs, but the pulley is actually held onto the spindle by the Morse Taper and the nut on the end. I had a motorcycle that sheared two. I lapped the shaft and stator with valve grinding paste, and banged it on with a mallet before tightened to the stipulated torque.
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.
I would assume the mower deck was engaged, check the shear half moon key in the shaft and flywheel. they are made to shear to prevent engine damage. other than that, check all the safty switches that keep the mower from starting unless they are engaged.
You probably shears something. There's probably a keyway with a broken shear key in it or perhaps a spring pin or clevis/hitch pin that's been broken. Try to look in the hub where the shaft goes through it coming from the transmission, if you see holes you need some sort of pin. If you take the wheel completely off and see a keyway in the shaft, you probably sheared the key and need a new one.
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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