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  #1  
Old 06-17-2010, 06:07 PM
JeepCreepn01 JeepCreepn01 is offline
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Scag drive belt prob

I have a Tiger cub bout 4 yrs old has the 48 deck if that matters, last week while cutting my yard i lost my drive belt just came off, looked at it and was alittle damaged so i bought a new one, well the new one has been on 4 times now, if i leave the throttle less then half it will stay on, if i throttle up any more it blows it off, I'm at a loss i can not figure out whats going on
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Old 06-17-2010, 06:26 PM
Ruben Rocha Ruben Rocha is offline
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Time to check all the pulleys for alignment and also some have a bearing that may be bad.
Causing the pulley to wobble so bad the belt jumps off.

Or the simple answer is some debris is stuck in one of the pulleys that causes the belt to come off. Could be anything like a piece of a pine cone,bla bla
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  #3  
Old 06-17-2010, 07:18 PM
JeepCreepn01 JeepCreepn01 is offline
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no debris so i guess i will have to really check all the pulleys, this sucks
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  #4  
Old 06-17-2010, 10:51 PM
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Restrorob Restrorob is offline
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Quote:
Originally Posted by JeepCreepn01 View Post
has the 48 deck if that matters, last week while cutting my yard i lost my drive belt
Since you added "48 deck if that matters" and you say you lost your drive belt can we assume you are not speaking of the deck drive belt but the unit trans belt ? http://www.lawnsite.com/showthread.php?t=144040
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Old 06-18-2010, 06:43 AM
JeepCreepn01 JeepCreepn01 is offline
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Quote:
Originally Posted by Restrorob View Post
Since you added "48 deck if that matters" and you say you lost your drive belt can we assume you are not speaking of the deck drive belt but the unit trans belt ? http://www.lawnsite.com/showthread.php?t=144040
yeah its the belt that goes from the electric PTO to the hydro units for the drive motors, not the belt that drives the blades
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Old 06-18-2010, 04:39 PM
JeepCreepn01 JeepCreepn01 is offline
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ok alittle update, i ulled off the pully that the idler spring attaches too because it seemed the spring was really bouncy when on, and spining the pully it spins straight no wobble, BUT its not smooth sounding like a bearing should be so i'm guessing at higher RPM's there is some bearing damage and that would cause enough wobble to throw everything off??
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  #7  
Old 06-18-2010, 05:03 PM
Ruben Rocha Ruben Rocha is offline
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I would start with that.
Especially if it has a bearing in it.
Just FYI even a new idler pulley will have some play in it when mounted.
But I would caution that you check the pulleys on the pumps for play.
As well as check the clutch pulley for excessive play
They probably don't have a bearing but it could be the pump shaft has some excessive play causing the pulley to wobble.
Meaning some bad news as far as price goes..
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Old 06-18-2010, 06:08 PM
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Restrorob Restrorob is offline
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Duuudes.....You guy's are loosin the professor here !



Quote:
Originally Posted by JeepCreepn01 View Post
yeah its the belt that goes from the electric PTO to the hydro units for the drive motors, not the belt that drives the blades
The belt that rides on the PTO clutch operates the blades only.



Quote:
Originally Posted by Ruben Rocha View Post
As well as check the clutch pulley for excessive play
What clutch pulley are you referring to that has to do with the hydros Ruben ?


Quote:
Originally Posted by JeepCreepn01 View Post
i bought a new one, well the new one has been on 4 times now

Do you mean it has came off 4 times now ?

If so, Lay the belt on a flat surface. Look at it closely for any twist looking area or flat spots on the inner "V" area, In some cases when a belt rolls off a pulley in damages the inner cords of the belt leaving a slight twist. Once a belt twist it can be almost impossible to keep it on especially on a spring loaded idler system.



I must be gettin too Ole for this internet diagnosing......
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  #9  
Old 06-19-2010, 05:29 PM
Ruben Rocha Ruben Rocha is offline
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As far as the clutch pulley I am talking about the pulley that is usually on the top of the clutch and that the clutch has really nothing to do with engaging the hydros but could be hosed/bent/nicked.

Last edited by Ruben Rocha; 06-19-2010 at 05:39 PM.
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  #10  
Old 06-19-2010, 06:08 PM
Ruben Rocha Ruben Rocha is offline
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Ran out of time to edit the last post.
But anyway I only referenced the pto clutch since that is what was referenced by JeepCreepn01.
I probably should not have used the term clutch pulley for the well informed people such as restrorob.
So beat me up Rob. I understand.
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