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Discussion Starter #1
Hi There,

Just spent a couple of hours reading through the posts and looking on the net to find out the amount of play acceptable in a 1989 Toro 521. Could not find any info and wanted to post the question hoping someone can enlighten me.

Have some play when I grab the auger and pull straight forward and push it back towards the engine. Figured it was the Auger Shaft Bearing and purchased a new bearing and flanges. Took the belt cover off to disassemble the machine to start replacing and the bearing looks good.

The entire shaft (with the pulley and belts still installed) moves forward and rearward about 1-1.5 inches when you pull/push on it. Is this assembly supposed to move this much?

There is no up and down play in the bearing/shaft and thinking the two bearing studs that secure it on the shaft may have loosened allowing the shaft to move forward through the bearing or maybe a Gearbox issue. Does this make sense? Can anyone shed some light on this?

Thanks in advance for your assistance.

mit678
 

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Hello and welcome to the forum. It sounds like you were going to replace the "IMPELLER" shaft bearing. Have you checked the "AUGER" shaft bearings that are on the side plates of the blower? A lot of older Toro's used bronze bushings and they do wear out causing movement. An 1 1/2" of movement is excessive and beyond acceptable.
 

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There should be zero play in any direction. The two bolts on either side of the auger housing prevent this. These two bolts go into the auger bearing so your problem must be somewhere in there.
 

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If your impeller shaft is able to move at all, something is wrong. The bearing flanges that hold your bearing in place at the back of your bucket, along with your bearing, should prevent movement. To move, either a flange is loose, or your bearing is not fitting tightly onto the shaft. If it's the bearing, it could have overheated, seized up and cracked, allowing the shaft to move through it. I've never seen it happen, but I can't think of anything else that would allow this. MH
 

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Discussion Starter #5
Thanks for the replies, have not had the time to get back to it, but plan to over the weekend. Have researched this site and can easily say I'd be totally lost without the info available on this forum...

The play is the Auger Shaft moving forward and aft through the spherical bearing when I pull/push on the auger. There is no up and down play on the auger bearing and minimal play on the sides where the auger attaches to the bucket.

I purchased the thrower new in 1989. It's been dependable but lost the auger tranny in the mid 90s. Had a Hardware Store that repaired Toro equipment rebuild it.
The spherical bearing has one set screw (internal Allen Head) which I have seen the current bearings sold. Do not think this is the original bearing and was likely replaced when the tranny was fixed.

What is the purpose of this one set screw? Is it made to hold the outer case of the spherical bearing stationary? I read some where a hole needs to be drilled in the bearing flange holder and the bearing is installed with the set screw in the hole. Also read in the Toro 2 Stage Service manual when you install the auger drive pulley, to secure it on the shaft to take up the end play...

I looked a little closer and total fwd/aft play I have is about .75 inch. The end of the auger shaft slightly protrudes from the rear pulley face. Maybe the fix is to shift the pulley forward on the shaft and secure to take up the play?

Been trying to find a 521 Service Manual without luck so I can positively determine what part is faulty so I have them on hand before splitting the bucket from drive assy. Wrote an eMail to Toro but have a feeling they will not provide them to "Home Owner" customers.

Any and all advice on straightening this out is greatly appreciated!

Thank you all.
 

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The Two Stage Toro service manual which is stickied applies to the 521, take a look and it should answer alot of your questions. As for the bearings, there should still be almost zero play with the auger bearings in place regardless of the impeller bearing or pulley placement. I'm convinced something is wrong here. When I put mine all back together last weekend the impeller shaft also slightly protrudes through the end of the pulley so this placement is likely bang on. And yes there is a set screw that goes through the impeller bearing (allen head) as well as one or two set srews that hold the pulley firm to the shaft. Hope that helps!
 

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Discussion Starter #8
Thanks for the replies. Took the blower apart and found the roller bearing disintegrated. Ordered the seals, bearings, thrust washers, bushings etc. to OH it a couple of years ago. The package with the 252-76 Needle Bearing identified actually had a had a Thrust Washer in it. Had to reorder the bearing.

All other parts seem good to go. So I am waiting to receive the Needle Bearing assy and put it back together. Will let you know how things come out.

Thanks for the advice.
 

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Mit678 - have you replaced your bearing yet? I noticed that when I rotate the augers by hand on my 824, the input shaft will slide fore and aft like yours did. I noticed the play between the bearing and the sheave was maybe 3/8" to 1/2". Sounds like I'll be doing a similar rebuild as you.
 

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Hi fibersport,

I have it torn apart with components cleaned. Received the parts but have not rebuilt it yet. Got side tracked purchasing a 1995 521 readying for my sis in law. will let you know how it goes when finished.

Good luck with your 824
 

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I realize it's been a few years, but I replaced my impeller shaft bearing on my 824 recently and noticed the same fore/aft play on my impeller shaft. Did you find some other cause for that play or is it there by design, which was my initial thought. The Toro manual mentions "do not preload the bearing" and I'm thinking that the play a design thing and the pulley should be tightened with the shaft as forward as possible. Just wonderin'
 
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