Gearcase question - Snowblower Forum : Snow Blower Forums
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post #1 of 23 Old 02-02-2015, 11:13 AM Thread Starter
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Gearcase question

So on my st824, when I engage the augers I get a grinding noise while the augers are turning like the augers are scratching against the bucket, but they are not. Also, with the shear bolts in place, I can spin the augers 1/2 a full rotation in either direction before they stop. There are only 2 shear bolts on this model.

Is this normal or do I have a problem here? I checked the gear case and their seems to be grease in there.
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post #2 of 23 Old 02-02-2015, 12:13 PM
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Originally Posted by jenkinsm2 View Post
So on my st824, when I engage the augers I get a grinding noise while the augers are turning like the augers are scratching against the bucket, but they are not. Also, with the shear bolts in place, I can spin the augers 1/2 a full rotation in either direction before they stop. There are only 2 shear bolts on this model.

Is this normal or do I have a problem here? I checked the gear case and their seems to be grease in there.
I am not familiar with your machine, but I would say your symptoms are not normal. I don't think it possible for the auger to rotate half a rotation freely if the gears in the gear case have all their teeth. Damaged shear pins or the holes through the auger shaft or the auger drive shaft (internal to the auger shaft) could account for some slop but not half a rotation. Easy to check by removing the shear pins and checking for wear and damage. If in doubt install new shear pins and see what the free play is like.

You probably need to remove the auger and impeller from the machine usually by removing the auger pulley and bearing assembly and the auger bearings on each side of auger housing to pull the assembly straight out. Then you can dismantle the augers and separate the gear case to inspect the gears.

Good luck.
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post #3 of 23 Old 02-02-2015, 12:19 PM Thread Starter
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OK,

2 primary questions come to mind. 1st, is it safe to use the machine to throw snow or would this cause further damage.
2nd, Does this sound like I need to replace the brass gear and the worm shaft?
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post #4 of 23 Old 02-02-2015, 12:36 PM
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Sounds like you need a new brass gear. At most should have just enough play to feel a slight movement. You might get lucky and only need to replace the pin holding the brass gear to the shaft. You will only know when you open it up. As for whether or not to use it, I would say you might make things worse. If the brass gear is already shot I suppose you can't really make that any worse, but maybe the impeller shaft worm is still in good shape. The brass probably won't mess the steel up, but it is hard to say.

From your symptoms I would say the machine probably won't work very well anyway even if you did try it.

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post #5 of 23 Old 02-02-2015, 12:43 PM
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OK,

2 primary questions come to mind. 1st, is it safe to use the machine to throw snow or would this cause further damage.
2nd, Does this sound like I need to replace the brass gear and the worm shaft?
I think your gear case gears are shot and will get worse with more use, but would need to be replaced anyway so no big deal. Further deterioration in the gears may cause the gear case itself to break so you need to get it fixed soon.

The both gears would need to be replaced as a set. It is likely that you don't need the shafts but it depends upon parts availability. Ariens will have a parts manual for your machine on their site in support area so you can see what is available. For my machine the top mounted worm gear is part of the impeller shaft but the auger worm gear appears to be keyed to the auger shaft and replaceable.

There will be some degree of safety concern if the damage causes parts to break and fly apart.

Good luck.
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post #6 of 23 Old 02-02-2015, 12:52 PM
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To add, Ariens doesn't directly sell the gears anymore. They only sell complete gearbox assemblies. There are still NOS OEM brass gears around if you look. Jackmels here has a pile of old parts and new gears he has been selling to a few members.

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post #7 of 23 Old 02-02-2015, 01:10 PM Thread Starter
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I see the brass gears being sold separate for about $65. I guess I should take it all apart and see what it looks like. Do you think I can get away with just replacing the brass gear? I guess it all depends on the damage. So far I have dropped $170 on this machine, hopefully I do not go over $300 when all is said and done.
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post #8 of 23 Old 02-02-2015, 02:48 PM Thread Starter
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Quote:
Originally Posted by Shryp View Post
To add, Ariens doesn't directly sell the gears anymore. They only sell complete gearbox assemblies. There are still NOS OEM brass gears around if you look. Jackmels here has a pile of old parts and new gears he has been selling to a few members.
Thanks man, honestly, I am considering selling this thing for what I spent on ti so far. From what I can tell replacing the worm gear and shaft is a tough job and costly. I am on the fence.
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post #9 of 23 Old 02-02-2015, 02:52 PM
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Another option, check around C/L or whatever for a dead snowblower, usually with a blown engine. You can swap the entire bucket assembly, auger, gearbox, impeller, all.
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post #10 of 23 Old 02-02-2015, 03:12 PM Thread Starter
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Another option, check around C/L or whatever for a dead snowblower, usually with a blown engine. You can swap the entire bucket assembly, auger, gearbox, impeller, all.
Yea, but those seem few and far between and they might have messed up gearcases as well. I read somewhere that there are alot of older ariens with messed up gear cases because people do not want to do the work.

If you guys tell me to stick with it and that its worth it I will. Another 65 to 100 bucks will not kill me.

Or if you say no way, spending $275 to buy and fix an st824 is too much money and time, then I will get rid of it.

I can make my own choices but I am looking for some opinions.
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