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jmh21586

thrower throwing belts

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jmh21586
I have a 42" snowblower on my landlord. I've only had the whole rig a short time. When I went out to blow snow the first time, I noticed I had a bad idler pulley. (One that changes belt direction up to motor pulley.) Bad bearing. Ended up damaging the belt a little. But now that I have a new pulle installed, the belt keeps coming off after a couple minutes use. Now I'm planning on putting a new belt on but could this really be the problem? I've also noticed that the blower isn't perfectly square with the tractor but cannot find anything that is bent. I don' know if it's just normal play or is it always suppose to be perfectly square? When it's in the up position it's kinda tweaked because it's only being held up on one side so maybe a little off is normal. This is the one thing I hate about belt drives. Thanks for any hel or suggestions.

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jmh21586
I'd also to add that it seems to come off the auger pulley. Which is also the hardest one to get the belt on because it does have a keeper that you have to pry the belt through to get it on. So I'm wondering if this is where the problem is.

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steve-wis
Belt jumping could be caused by pulleys being mis-aligned, bad bearings, or a bad belt. If you damaged the belt at all I would replace it first, and use an oem belt. The cheaper ones work ok for a bit but the Simplicity belts are much better and last much longer. A friend of mine has a mid 90's 16 hp with 42 inch blower, he blows quite a bit of area and is on his second belt in 16 years. If the new belt doesn't do it, check you manual and do the checks you will find there as far as pulleys, tension of belt, mounting problems, etc. I have used shaft drive blowers and liked them, but a good belt drive set up right is a match for any shaft, imho. Good luck!! Steve

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jmh21586
Thanks. I'll order a belt now. How can pulley alignment be adjusted?? I have a manual but I haven't seen anything in there about aligning pulleys. Mqybe I missed it.

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Simpleton7016
Belt guides are critical, but also a pain in the dupa if the belt keeps jumping. Do check the primary drive pulley on the snowthrower. It can be installed with the hub in, or hub out and it will give you a little bit of alignment correction. I do not recall which way is which, but when I switched from front PTO to mid PTO (seeral years ago now) I did switch that pulley around. Could be that the previous owner used that blower on a mid pto.

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jmh21586
I'll try the primary drive on the blower. The more I think about it it must have to do with this. Why else would the belt come off this pulley, as hard as it is to get back on. If the problem were somewhere else, I believe the belt would stay on that pulley. I'll update tommorrow. Thanks for the help.

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Chris727
Any Simplicty dealer can order you the factory belt. If your local dealer won't cooperate, then you can order from www.jackssmallengines.com or one of the site sponsors such as Sandy Lake Implement or Wells Implement.

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MPH
Another possibility of the cause is if the idler pullies are bent outward or inward. This can happen when such things as sticks or rocks stop the blower at WOT. A good wrecking bar can be use to get them back close so the belt is coming off of them sq and basicly centered. These are not my favorite drive system but can be tweeted to work real good, takes some fidling if like me and have never seen a 'good one'. If I recall correctly, the most important one is the clutched one .

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MikeES
I will add to Marty's post. You can bend the idler pulley mounts by dragging the thrower around with the hitch on. I had the same problem with a blower I picked up. Wrecked 2 belts in 20 mins. XX(, but with at little tweaking of the pulley mounts, the same belt has now been on for over 10 years. ^ Also the thrower should be square to the tractor, though it will not lift even. Most will lift higher on the right.

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Simpleton7016
And I will add on to what Mike added to Marty. I discovered this when I was working on my dethatcher....use the biggest and tightest fitting clevis pins in all the mounting holes. One, it will fill in some of the back and forth or side to side slop you are encountering and two, it will keep the holes from warbling out any further than they already have.

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D-17_Dave
First thing is to get the correct operators manual. Compare the pics and setup instructions closely for any discrepancy. You'll need Simplicity idler's and an OEM belt. If you'll do this to start with you'll be very happy with the results. That said you'll be fine as long as no one else started bending the mounts and idler brackets to accept non OEM products. These blowers are setup to route the belts in various twists and turns. If the leading edges of each pulley/idler are not properly aligned with the direction of the belt it WILL throw the belt. A belt can exit a pulley a little off but it cannot go onto a pulley in an odd direction. This will almost always throw the belt. Then once you have a notch in the belt from being marked it will throw every time it passes that spot.

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