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Lawn Tractor Rubber smell

Old 05-25-2010, 03:25 PM
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Default Lawn Tractor Rubber smell

I am getting a slight burnt belt/rubber smell - no noise / tractor runs fine and its only 3 years old but I notice the belts seem to get pretty hot -especially the mowerblade belt -upon inspection they both look fine - runs and cuts fine - any ideas? Pulleys all look clean and in good condition and spin freely (In the past - I usually have gotten 10 maybe 20 years or so on belts and they looked cracked worn at that time - in fact I think I only ever changed one once)

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Old 05-25-2010, 03:33 PM
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Originally Posted by LI Sound Grunt View Post
I am getting a slight burnt belt/rubber smell - no noise / tractor runs fine and its only 3 years old but I notice the belts seem to get pretty hot - especially the drive belt -upon inspection they both look fine - runs and cuts fine - any ideas? Pulleys all look clean and in good condition and spin freely (In the past - I usually have gotten 10 maybe 20 years or so on belts and they looked cracked worn at that time - in fact I think I only ever changed one once)
I say that's it.
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Old 05-25-2010, 04:26 PM
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Originally Posted by Cmann View Post
I say that's it.
Yes I am sure is a belt smell - But why they dont seem to be slipping and everything seems free. The tensioner seems fine also ......sems like normal streetching would be taken up by the tensioner and I can't see how anything got tighter all of a sudden..


Is three years all I am going to get? Is that the new normal?

Thanks
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Old 05-25-2010, 04:31 PM
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Check to see if the Tension-er isn't to tight?
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Old 05-25-2010, 04:46 PM
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Make sure the belts aren't rubbing on something. Very common for something to shift and a belt will start to rub. You need to have the deck engaged and CAREFULLY take a look at all of the deck belts. Remember, they wobble quite a bit when running so while at rest they might be clear of everything when running they can constantly rub it. Also, how many hours on this machine? Pulleys can get worn down and instead of gripping the sides of the V belt they grip the bottom.
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Old 05-25-2010, 05:01 PM
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Drop your deck, and lube the blade spindles and all of the pulleys for both belts. I dont know if you dropped it before or not but depending on the brand there should be grease zerks to lube. Also make sure the belts are in all of the pulleys where they belong. My Cub Cadet was doing that, it turned out the drive belt had slipped off the vertical to horizontal pulley.
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Old 05-25-2010, 05:42 PM
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some mower decks have a brake on them to slow the blades faster check to see if it not stuck
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Old 05-25-2010, 06:09 PM
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Check your exhaust, make sure that you dont have exhaust heat blowing on the belts. Also, if you let the grass get too thick before you cut, you will burn them up quicker. I get 6 months out of my belts on commercial mowers under heavy use.
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Old 05-26-2010, 05:59 AM
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I know this sounds funny but did you sniff the belt? Depending on the transmition type for your mower, it could be the drive system itself. Some mowers use a rubber wheel on the drive disk.
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Old 05-26-2010, 10:14 AM
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I had a friend who repaired one for a customer whose mower did a similar thing. Started as a smell, then a blue smoke, then a black smoke, then an overheat and shutdown. Turned out it was the bearing on the engine's alternator not spinning with the belt. Not sure what kind of mower you have but this was on a commercial diesel mower of some sort.
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Old 05-26-2010, 10:41 AM
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Often there's a belt guide (basically a rod) to keep the loose belt from coming off..the belt can get on the wrong side of these guides and rub. My Scotts/whatever does this alot.
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Old 05-26-2010, 10:43 AM
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See Bob, that's what you get for buying a piece of junk from you know where. ~

If I recall, you don't take your mower deck off for the winter do you Bob? So everything would be as they were from last year, am I correct?

Do you have any grease fittings on any of those pulleys down below? "Maybe" one of the pulleys needs greasing and since it needs greasing there is added resistence to that pulley when it is hot, therefore tightening up and therefore causing the belt to skid across the pulley instead of the pulley freely turning? Check to see how free the pulleys are after you've ran the tractor for awhile. ....make sure you shut the tractor off before you check Bob.
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Old 05-26-2010, 12:21 PM
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Originally Posted by Garett View Post
See Bob, that's what you get for buying a piece of junk from you know where. ~

If I recall, you don't take your mower deck off for the winter do you Bob? So everything would be as they were from last year, am I correct?

Do you have any grease fittings on any of those pulleys down below? "Maybe" one of the pulleys needs greasing and since it needs greasing there is added resistence to that pulley when it is hot, therefore tightening up and therefore causing the belt to skid across the pulley instead of the pulley freely turning? Check to see how free the pulleys are after you've ran the tractor for awhile. ....make sure you shut the tractor off before you check Bob.
Garett, you are missing the point. I buy these cheapo things from you know where and then do absolutely no maintenance until it dies 30 years from now. Well, change the oil once a year...

I used to take the deck off to use it in the woods but I am now too lazy - so yea the deck could be bent to crap somewhere. Anyway lots of possibilities mentioned here

For the information of others that use their tactors hard, I also checked on the web for information and found that these tractors have a cooling fan over the auto transaxle that needs to be kept clean - mine looked OK.

So haven't taken a good look yet, had a case of global darkness last night and very bad global warming here today - it will be a record day - 94 here at my house in the shade. Reminding me of my Ft. Jackson days..man, that place was hotter than Nam (where I was in the hills in the jungle shade at least).

Like I said everything seems to turn easy but I will grease the pullies and inspect them closely and give the deck a good once over. If the small gets worse I'll splurge on a new belt.
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Old 05-26-2010, 01:38 PM
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Originally Posted by LI Sound Grunt View Post
If the small gets worse I'll splurge on a new belt.
If it aint broke, don't fix it.
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Old 05-26-2010, 02:27 PM
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Originally Posted by Cmann View Post
If it aint broke, don't fix it.
That's my theory and I am sticking to it..... I'll know more when this heatwave ends -Am not used to this 90 dgeree stuff - Let it Grow!!!
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Old 05-26-2010, 08:38 PM
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Is your exhaust burning something?
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Old 05-27-2010, 10:24 PM
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Originally Posted by LI Sound Grunt View Post
Garett, you are missing the point. I buy these cheapo things from you know where and then do absolutely no maintenance until it dies 30 years from now.
......I know, that's what kills me Bob. props to yah my friend.

Originally Posted by 11andy11 View Post
Is your exhaust burning something?
Andy you have the right theory, but, I think the only exhaust that is burning is Bob's exhaust......he likes his Chilli, and hot.
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Old 05-28-2010, 04:24 AM
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Time for new spindles.
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Old 06-02-2010, 01:25 PM
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Finally got cool and dry enough to do the lawn

K.I.S.S. - the damn belt was outside the pulley giides on the front (engine) drive pulley.

Nothing like doing a good visual inspection before you do any other work!
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Old 06-02-2010, 08:21 PM
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Originally Posted by nautiduck View Post
Drop your deck, and lube the blade spindles and all of the pulleys for both belts. I dont know if you dropped it before or not but depending on the brand there should be grease zerks to lube. Also make sure the belts are in all of the pulleys where they belong. My Cub Cadet was doing that, it turned out the drive belt had slipped off the vertical to horizontal pulley.
It's not a Cub Cadet is it?
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