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I need to replace a mandrel pulley bearing on lawn tractor model number 917.275753

How do i replace the mandrel pulley bearing on a Craftsman lawn tractor, model number 917.275753?

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Craftsman , Lawn Tractors , Lawn Mowers
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4 Answers from these members:
Mark T
Tom,






If you cannot use the blade to hold the mandrel shaft, you need to use an impact wrench to remove the nut. To do this hold the pulley with a gloved hand while using the impact. If you do not have an impact wrench, you can rent one at your local rental center. They should have an electric model. Another option is to take the mower deck to a local auto repair shop. They will usually remove the nut for you and most of the time will not charge anything.







I hope this is helpful. Please let me know if you need further assistance.







Thank you for using Manage my life.







Mark T.
by Mark T Earned 1,607 community points in Craftsman
July 11th, 2012
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Wade, the "key" at the bottom of the shaft that holds the blade is sheared off and two bolts are broken off in the mandrel. I need to replace the mandrel but, I can't figure out how to hold the pully so I can take the nut off the top. Any ideas? I'd just use the blade to hold it, but, like I said the key that holds the blade is too damaged to hold the blade. Thanks for your time.
by Manage My Life
July 10th, 2012
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Manage My Life
If you are trying to replace the lower mandrel bearing, you will have to replace the shaft as the bearing comes already pressed onto the shaft. If you need to replace the upper bearing; the shaft will still have to be removed. I will describe how to take the whole thing apart so you will have a better understanding of how to get into it. It’s a fairly simple process and since you’re even asking, I’m sure you will be able to do it with little to no problem.

The very first thing you want to do, even before you get parts, is make sure that nothing is wrong with the mandrel housing. There are 3 â€Å“legs” on the mandrel housing. The bolts that hold the mandrel assembly onto the deck thread into these legs. If any of the legs are cracked, the entire mandrel assembly will be the way to go since you also are in need of bearings. Part 130794 is the complete assembly. It is the housing, the shaft, and bearings.

Once you determine that the housing is in good order, you can proceed. 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.

Once you have the pulley nut tight you should be ready to get back to mowing. I’ll list out some part numbers in case you need any of them.

Top bearing: 110485X

Bottom bearing and shaft: 137646 (this will have both bearings, shaft, and nut)

Complete mandrel assembly: 130794 (this will have bearings, shaft, hardware, and housing)

Mandrel pulley: 173436

Bolts for mandrel housing: 173984

You can go

HERE

to order any parts you may need or to look up any others you find yourself in need of.

Thank you for using Manage My Life!
by Manage My Life
September 16th, 2010
Answered in 17 hours
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Manage My Life
That's great that you want to replace the part on your own. While you wait for the expert to answer i would suggest for you to look at the link down bellow. I hope that it helps in some way, good luck.
by Manage My Life
September 15th, 2010
Answered in 5 minutes
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