Thank you for your question.
I am sorry you are having a problem with taking the mandrel apart. You will need to remove the belt from the mandrel pulley. Then remove the nut on top of the pulley. I use leather work gloves to hold the blade and an impact wrench to loosen the nut. If you don’t have an impact wrench it would be best if you take a chunk of wood and place it between the blade and deck to keep the mandrel from turning while you remove that nut. It’s a lock nut, so it’s not going to just spin right off.
Pay close attention to the blade so you don’t cut yourself
Once you remove the nut, you should be able to remove the pulley. Make sure the splines on the shaft and matching splines on the pulley are both good. If in question, replace the shaft and pulley as you do not want to get it back together only to have to take it down again and add more parts. Once you have the pulley off, there will be a washer that sits beneath it. Make sure you hold onto that washer. When you put this all back together, that washer absolutely must be under the pulley or it will get into the upper housing and destroy it.
Now that you have the nut removed, the pulley removed, and the washer removed you can screw the nut back onto the shaft a few turns and smack it with a hammer to knock the shaft out of the housing. If the lower bearing stays in the housing and doesn’t come out with the shaft, you will have to get a shaft assembly. It is virtually impossible to press that bearing back onto the shaft.
Now that the shaft is out, chances are the upper bearing is still sitting in the housing. Go into the housing from the bottom side with a punch and knock the top bearing out. Again, check the housing for any sort of damage. If everything looks good, you can go ahead and start putting everything back together.
Set the top bearing into its seat on top of the housing. If the bearing doesn’t want to sit right down into its seat, you can tap it (do not beat it into place) with a hammer to get it into place. Then slide the shaft (and lower bearing) into place. Here, it gets a little tricky because nothing wants to stay in place and if you don’t have an assistant with you it can be a bit trying (to say the least). When you get the shaft into place go ahead and put the blade onto the shaft. Have your assistant hold the blade (remember to watch sharp edges) and push up so everything is in place. Then put the washer on the top end of the shaft and put the pulley on to of that. After that go ahead and put the nut on the shaft. Screw it down and make sure you get it tight. Remember how hard it was to get that nut to break loose; it needs to be on the shaft tight. If it’s not tight enough the pulley will work loose and you will end up having to do all this again because the splines on the pulley and shaft will get damaged. I just can’t say enough about that nut being tight.
Things to know
Mandrel Nut: 75 foot pounds torque
Blade bolt: 27-35 foot pounds torque
Mandrel housing mounting holes are not threaded. The bolts are self-tapping, you can use the bolt to tap them before you mount the housing.
I hope this is helpful please let me know if you need further assistance.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
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