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What is causing my belt to "flip" invert?


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#1 dualresponse1731 ONLINE  

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Posted May 20, 2016 - 06:25 PM

The PTO to mower deck belt on my ford lgt 145 keeps "flipping" upside down so the "V" portion of the belt faces outwards at the PTO pulley and the mule wheel pulleys. It doesn't jump the belt, it just flips, and will wear the belt out in short order if I don't fix it. I have never encountered this before. The "V" of the belt should fit into the "V" of the pulley, but  it keeps flipping. Does anyone know what causes it and what is the fix?


Edited by dualresponse1731, May 20, 2016 - 06:30 PM.

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#2 Auburn David OFFLINE  

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Posted May 20, 2016 - 06:59 PM

Wish I could help..but I have no clue.


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#3 truck21 ONLINE  

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Posted May 20, 2016 - 06:59 PM

Probably need a new belt. Sometimes when they get flipped by a twig or something and are run like that they actually kind of develope a memory and will continue to flip.


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#4 KennyP ONLINE  

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Posted May 20, 2016 - 07:04 PM

Probably need a new belt. Sometimes when they get flipped by a twig or something and are run like that they actually kind of develope a memory and will continue to flip.

I've seen that too!


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#5 dualresponse1731 ONLINE  

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Posted May 20, 2016 - 07:04 PM

Ha! It was a new belt! :smilewink: The "old" belt flipped too- so I bought a new one hoping the problem would go away- but it hasn't- so I'm scratching my head on this one! 

edit one- and by "old belt" - I mean the old belt I used on my dad's lgt when he let me use it to cut the lawn- not this tractor.

I also want to add- I have never used this tractor for mowing before. It's my repower, and the pto is in the original position. The mule wheels are odd (for me) in that one wheel is slightly smaller than the other-in my experience, they have always been same size. Finally- the belt does NOT flip on the mower deck pulley. It is flipping between the sharp turn angles of the mule wheels and the engine pto pulley.

 

Here's a dumb question- There weren't two different mule pulley lever lengths between open and closed sided LGTs, were there?????

It seems like the distance between the PTO pulley and the mule wheels is very short/with a sharp drastic turn in the belt.

 

I'm stumped! :wallbanging:


Edited by dualresponse1731, May 20, 2016 - 07:13 PM.


#6 KennyP ONLINE  

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Posted May 20, 2016 - 07:23 PM

I just went out and looked under my 'closed' side Ford. The RH  mule drive pulley is smaller than the LH. Not much room on up to the PTO.


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#7 dualresponse1731 ONLINE  

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Posted May 20, 2016 - 07:29 PM

Thanks for looking. Leave it to me to find a problem NO ONE has ever found in the history of something to find- 

Perhaps I will buy a new  (new) belt of a different make than what I bought.

 

The original belt was FORD

The replacement was a certain size of a generic brand ( I can't recall at moment- 83? inches... or something)  x 1/2 inch. 

I'm wondering if my length is off- OR if there are different "V" shapes on different brands....

 

I don't know... I'm just thinking out loud.

 

.also when my "old belt" flipped- I assumed there was not enough tension on the pulley- so I tightened the spring. When I got the "new" belt- I did not adjust the spring tension. I am under the assumption that a tighter spring tension would prohibit the flipping. I am wondering if perhaps I need to tighten it more... however.. in my experience with the tractors, I never once had to adjust the tension on the pulleys before.

 

..again- throwing out thoughts...

 

 

Thanks for everyone's input!

Ron


Edited by dualresponse1731, May 20, 2016 - 07:40 PM.


#8 dualresponse1731 ONLINE  

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Posted May 20, 2016 - 07:59 PM

okay. more thoughts.

I bought an 82 3/8 x 1/2 generic belt.

 

Looking at the manual section on this forum- deck belts go as follows:

 

72-73- 78.36 inches

74+ 82.62 inches??????(see next)

74+ 83.25 inches???? (why two 74+model year  lengths?)

77+ 48.50 inches????? (huh?!?!?! I don't care WHAT happened in 77 the length did NOT get cut in half!!!!!!!)

 

Mine is closed sided- so I assume it is 77+ model year ( I am not too familiar with LGT model years - such as when open became closed sided...)

I simply do not understand the manual which is PDF'ed in this website's archive.

 

mmmmm.....

 

NEVER MIND>>>>>The differences were between the small and larger decks-

For all intents and purposes- the 50 deck in my year should be 83.25 inches...

Perhaps LESS tension would ironically improve the situation?

I will give that a try!


Edited by dualresponse1731, May 20, 2016 - 08:06 PM.


#9 olcowhand ONLINE  

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Posted May 20, 2016 - 08:42 PM

 

 

 

Perhaps LESS tension would ironically improve the situation?

I will give that a try!

 

I was just thinking the tension may be too tight, then seen your quoted post.  I'd give that a try.


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#10 JBRamsey OFFLINE  

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Posted May 20, 2016 - 09:50 PM

The belt on my suburban kept flipping when I got it. Found the belt guide on this site and the guy before me had too. Arrow a belt on. Put the right size on and no more problem.
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#11 KennyP ONLINE  

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Posted May 21, 2016 - 04:38 AM

On my 1977 LGT 165, I have the 251499 belt that is 1/2" X 78". That is the number I put in the file for parts for the machine. It works well. I use the Kevlar belts, too.

 

Also, this is the belt # NH calls for for the 42" mower (09jc9835). There are many listings for the belts on the NH parts site, you have to use your deck model # to get the right one.



#12 JBRamsey OFFLINE  

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Posted May 21, 2016 - 07:01 AM

The belt on my suburban kept flipping when I got it. Found the belt guide on this site and the guy before me had too. Arrow a belt on. Put the right size on and no more problem.


Lots of auto fill in my post. Sorry. The guy before me put a too narrow belt on it. Once I put the correct width on, the flipping stopped. He had a half inch wide belt and I needed a 5/8. It pulled like a new tractor after that.

#13 dualresponse1731 ONLINE  

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Posted May 21, 2016 - 07:49 AM

Thanks everyone!

I went out to the garage this morning and found ONE big possible culprit. The pulley bolt wasn't seated properly, and interfering with the tensioner washer, preventing the tensioner to work smoothly. The tensioner would catch and jump as the washer cleared the bolt (see first pic).

 

The second pic shows the belt flipped. 

 

I disassembled/ and rebuilt the assembly to prevent the interference.(third pic) I also adjusted the fixed mule pulley wheel for better alignment.  I haven't had a chance to try it due to rain- but can't wait to try it!

 

One final question- in  the first pic, you can see the two different sized mule wheels. Does the smaller look to be about the right size?  Reason I ask is that I have a spare larger mule wheel to make them both large, but what I am assuming (perhaps incorrectly) is that the 82 inch belt is for the 50 inch deck with the two different wheels, and the 83 inch belt is for the 50 inch deck with two large wheels.  (I could be wrong). This mule drive has been jury rigged by a previous owner, so I don't know if those are even stock wheel sizes.

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Edited by dualresponse1731, May 21, 2016 - 07:53 AM.


#14 KennyP ONLINE  

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Posted May 21, 2016 - 09:43 AM

I just checked my pulley sizes. Small is about 3.5", large about 4.5". Grabbed a couple shots from mine.

 

DSCN1760.JPG     DSCN1761.JPG


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#15 dualresponse1731 ONLINE  

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Posted May 21, 2016 - 09:56 AM

Thanks! That is the exact same setup as I've got. 3.5 and 4.5! This gives me confidence that the previous owner didn't change stuff as much as I thought. I always assumed that a pulley had failed and he threw on the small one because it was  laying around/ all he could find. It's good to know that it's factory.


Edited by dualresponse1731, May 21, 2016 - 10:00 AM.

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