It's much easier to do on the tractor.
1. Leave deck installed.
2. Jack tractor up and lower deck.
3. Run a heavy wire through the mandrel pulley's tie down hole.
4. Raise deck and tie wire around the deck.
5. Lower deck and remove top nut.
6. Raise deck and remove shaft.
You can modify this procedure to loose the nut if you don't have a jack and remove it once the deck is off. Retorque nut to 35 ft. lbs during install.
SOURCE: Need image, assembled craftsman model 917.276813 lawn mower deck
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SOURCE: How can I un-bolt the Mandrel Pulley from the shaft?
If you have the deck removed from under the tractor you can try putting the blade back on tight if you have removed it and then use the blade to keep the mandrel shaft from turning. It takes quite a bit of torque to break the nut loose on the pulley so a socket and ratchet or breaker bar is the best thing to use. Other than that there is no "special" tool required
SOURCE: I had to get a new mandrel housing which goes
You have to remove the nut on top of the pulley. With the pulley off, the shaft will slide out the bottom with the blade. Don't forget when you put the pulley back on, the washer/spacer goes BETWEEN the pully and housing, NOT on top of the pulley. Dwain
SOURCE: MY husqvarna yth2148 left side deck mandrel and
Did it break or overheat? There is a small spacer washer that goes under the pulley between the pulley and bearing, if that washer was missing or got ground up on the first one and you didn't notice it the next pulley would rub hard against the top of the mandrel and fail.
SOURCE: removing bearing
Sometimes heating the outer ring of the bearing with a propane torch helps to resolve this problem.
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