How do I get the crank Pulley off my 26 hp Briggs?

Well let us go down the line on this one. I have two Husqvarna garden tractors with twin Briggs engines. Have never had any trouble getting the pulleys off so let us look for a problem. Different companys do different stuff. Does your pulley have a set screw in it? Look under the crud. I know on my engine it would be vary hard to use a puller because the end of the pulley is right up to the edge of the crank shaft. You would end up destroying the pulley to get it off and you need to be careful with heat on a crank shaft but you may have no choice. You might need to heat the pulley and use a long pinch bar if it is rusted on. On one small engine I had to cut the pulley off with a Dremmel tool. Took forever but I did get it off. Most of these engines leak a little oil so rusted on pulleys are kind of rare. Heaven help you if someone used lock tite on it!
 
Clean the pulley and crankshaft the best you can with a small wire brush and brake or carb cleaner. After reading jeffcat's response and checking for a setscrew or other retention device, if you find nothing like that and conclude the pulley is actually rusted on, here's a way to minimize damage to the pulley and crankshaft.

Assuming you've got a pulley that is basically two pieces of stamped steel on a forged hub, you can drill a couple holes in the flange/sheet metal part of the pulley close to the hub. A variable speed drill works best, since you need to stop drilling when you have gone through the sheet metal. Then you get your two-arm gear puller and run bolts through those holes and put nuts on the end under the pulley flange.
 
You don't say what its on. Or how old it is. The older, usually the more firmly rusted on there it is. I have seen some MTD pulleys that had to be cut off in pieces.

First, verify that a replacement is available. At least you will rest easier if it is. . . . And you might get rougher on the old pulley if you know you aren't stuck if it doesn't come off.

In most cases, you can use a split bearing separator to get behind at least the lower flange of the pulley, then pull it with bolts to a bearing puller that is basically a beam with a pusher screw through the center. I usually put a bolt in the end of the crank for the puller to push against. It even helps if you drill a dimple in the bolt head for the puller to center up on.
Sometimes heat helps, but be warned it may damage the pto seal and you may want to change the pto seal before you put it back together.

If all else fails, You can probably cut the pulley off the crank. I have had to do 2 or 3 of the MTD/Troybilt units with the 2 speed transmission in them. I usually just saw with a sawsall down through the pulley on the keyway side, trying to just miss the crank. Be careful the sawsall blade doesn't saw into the crankcase.
 
Not all but some crank pulleys have a threaded hole. You remove the 3/8 bolt and a larger fine thread bolt will thread into the pulley. The end of the bolt will push against the end of the crank and push the pulley off.

Not all had that feature.

I have used pullers, heat and pry pars with small blocks of wood to remove crank pulleys.
 
Thanks guys. I ended up using a cut off wheel abs splitting it. 2009 bad boy ztl.pulley is not the right one 3.5 " suppose to be 4 3/4" hoping the right one speeds up the mower.
 

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