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formariz

What is destroying my belts?

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This is the third belt this last year on this deck. I have changed one pulley and the idler. The other two pulleys have nothing on them that would cause this. The same thing happen to first belt in beginning of season before I made any changes. After changes same thing is happening to belts. They all look exactly the same. Everything is aligned, and turn freely. Just driving me nuts. 

Any ideas as to what is causing it?

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First two were original Toro. After second one got tired of spending that much since it was probably going to happen again so I got a generic brand. All three look exactly alike.

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6 minutes ago, AMC RULES said:

Tried a kevlar belt yet?   :scratchead:

Actually the one that came with deck was a Kevlar belt and looked the same way. I got deck with a C125 that sat for many years, so the first thing I did was to change it.

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From the look of your belts, I wonder if your drive pulley is spinning on a belt that is not moving.

Check you spindles/bearings.  One (or more) of them may be shot, causing the belt to stop.

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If one looks close to the areas where a section is missing, and there are about 8 or so in the whole belt, one notices that they are about all the same length and have polished round ends and a polished bottom. It almost looks as if belt stopped and blades kept turning ,therefor pulley burning the belt in that area. I just don't see how that could happen. As it is being used it cuts perfectly without any obvious noises or smells.

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Could one of the pulleys in the system be bent or have a pinch point that causes the belt to jerk as it goes through?

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4 minutes ago, 953 nut said:

Could one of the pulleys in the system be bent or have a pinch point that causes the belt to jerk as it goes through?

 

 

Checked all of above, all pulley surfaces are smooth originally the two qestionable ones were changed. All three pulleys are aligned and spindles are perpendicular to deck. Deck shell is also straight and not twisted.

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43 minutes ago, cheesegrader said:

From the look of your belts, I wonder if your drive pulley is spinning on a belt that is not moving.

Check you spindles/bearings.  One (or more) of them may be shot, causing the belt to stop.



I'm thinking one is randomly seizing, then starting to turn again, but you would think the belt would smoke. 

 

 

38 minutes ago, formariz said:

 

If one looks close to the areas where a section is missing, and there are about 8 or so in the whole belt, one notices that they are about all the same length and have polished round ends and a polished bottom. It almost looks as if belt stopped and blades kept turning ,therefor pulley burning the belt in that area. I just don't see how that could happen. As it is being used it cuts perfectly without any obvious noises or smells.

 



My original thought was something was slicing them, due to the small cuts that seem to match the edges of the missing parts. Do the belts look melted, burned, etc?

 

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Does the belt feel hot to the touch after cutting? Could a spindle bearing be getting tight after some run time. Could be tensioner not be releasing causing the PTO to be trying to engage the belt when it's not supposed to be?  Just trying to cover all the bases here. I would find it unlikely that the blades would coast that much to wreck a belt in that short of time. I take it there are not blade brakes on your deck? Maybe you could walk beside it while someone is cutting to see if anything funky is going on

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3 minutes ago, WNYPCRepair said:



I'm thinking one is randomly seizing, then starting to turn again, but you would think the belt would smoke. 

 

 



My original thought was something was slicing them, due to the small cuts that seem to match the edges of the missing parts. Do the belts look melted, burned, etc?

 

Only the missing areas look like the result of some kind of abrasion. Then you have all of these strange "cracks".

 

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I can speak  for all of here that that's a big 10-4 on seeing that happen to a belt....just not on three quality belts in a year. ..somethins gotta be rotten in Denmark so to speak.

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IDEAS:  1) remove the belt and run each spindle with an electric drill at full speed (with socket to fit top nut). They should NOT bind at all. 2) Test action of the SPRING TENSIONER and the IDLEY PULLEY. if the spring is TOO LOOSE, belt will drag and burn.  3) Dirt / debris accumulated under the pulleys? ? ? ?    4) A low-quality belt will not withstand the 'back-bending' that an OEM belt is designed for.    

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It looks like the belt is hitting the bottom of one of the pulleys instead of on the sides.    Is it possible one of the pulleys is too wide for the belt you are using?

Did you check the very bottom of the  pulleys for a burr?

Edited by ekennell
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15 hours ago, Terry M said:

Are you maybe driving too fast through the grass while cutting? 

Cas , I just thought of this because it was happening to me on an old Bolens tractor I once cut grass with.   Belt would intermittently stop in the taller thicker grass and the belts would end up looking like your pics above.

Kinda weird how you can't find the "smoking Gun ":eusa-think:.....  although I think the guys above probably will be right..

 

Just my 2 cents:)

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The cords that give the belt it's strength appear to be very close to the back side of the belt. Usually they are closer to the center for a belt that is designed to bend backwards over a flat idler pulley.

 

Garry

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54 minutes ago, gwest_ca said:

The cords that give the belt it's strength appear to be very close to the back side of the belt. Usually they are closer to the center for a belt that is designed to bend backwards over a flat idler pulley.

 

Garry

This one is a generic brand belt. However the first two were the correct Toro genuine belts and yes they were different in the aspect that the reinforcing cord was at about the center. Nevertheless the same thing happened, the second one actually lasting much less than the others.

5 hours ago, ekennell said:

It looks like the belt is hitting the bottom of one of the pulleys instead of on the sides.    Is it possible one of the pulleys is too wide for the belt you are using?

Did you check the very bottom of the  pulleys for a burr?

Never paid attention to that actually since  although first two were correct and genuine Toro belts. I am going to check that tonight.

1 hour ago, Terry M said:

Cas , I just thought of this because it was happening to me on an old Bolens tractor I once cut grass with.   Belt would intermittently stop in the taller thicker grass and the belts would end up looking like your pics above.

Kinda weird how you can't find the "smoking Gun ":eusa-think:.....  although I think the guys above probably will be right..

 

Just my 2 cents:)

That condition would not really happen here. I have a highly "manicured" lawn which is cut at least twice a week. I also cut it relatively slow so I get a good quality cut going over it a second time at a different angle. (I know i got issues, but it also is one of the few times I got a legitimate excuse to be riding tractors so I have to make the most of it.)

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18 hours ago, daveoman1966 said:

IDEAS:  1) remove the belt and run each spindle with an electric drill at full speed (with socket to fit top nut). They should NOT bind at all. 2) Test action of the SPRING TENSIONER and the IDLEY PULLEY. if the spring is TOO LOOSE, belt will drag and burn.  3) Dirt / debris accumulated under the pulleys? ? ? ?    4) A low-quality belt will not withstand the 'back-bending' that an OEM belt is designed for.    

All but #1 have pretty much been ruled out. I will try that one tonight.

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Don't forget  the mule drive pulleys and bearings.

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Squonk, that was what I was thinking , A small twig got caught in the mule drive and messed up the belt , bits and pieces of the belt dropped to the deck and ate the deck belt up in chunks. Also had a problem where I was sold an automotive belt in error and it did not last anytime.

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18 minutes ago, squonk said:

Don't forget  the mule drive pulleys and bearings.

That belt never has a problem. Its only the one that drives blades.

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IDEAS:  (5) Are the 3 blades sharp? ? ?   MAYBE....if blades are dull, the belt would have to work much harder to spin the pulleys, possibly leading to belt drag / burn. 

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