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Belt Problem, John Deere D170 54 inch deck


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#1 bear15 OFFLINE  

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Posted June 23, 2018 - 12:44 PM

We have a John Deere D170 with 54 inch deck. When the grass is taller/thicker the belt comes off and needs to be put back on which is a pain. Does anyone know if there is a way to adjust the belt tension or a fix to this problem?



#2 akretowicz OFFLINE  

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Posted June 23, 2018 - 03:42 PM

How is your belt tightener spring?



#3 bear15 OFFLINE  

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Posted June 23, 2018 - 06:01 PM

I am not sure. Is this something that can be fixed? Do you know if there is any type of adjustment we can try?

How is your belt tightener spring?



#4 EricFromPa ONLINE  

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Posted June 23, 2018 - 10:43 PM

From JDs Parts Catalog site.

 

http://jdpc.deere.co..._________B2.gif

http://jdpc.deere.co..._________A1.gif

http://jdpc.deere.co..._________A1.gif

 

If ya want to find your mower type in D170 in the top left Model search box and hit Search.

 

http://jdpc.deere.co...model&model=110

 

Untitled3456.jpg

 

 

 

I'm not a big fan of JD. Finding info on any of them is very hard unless you buy one of there super over priced manuals from a dealer. They will sell you a manual for it but if you acquire one of there copyrighted manuals and they find out about it, you could be in big trouble.


Edited by EricFromPa, June 23, 2018 - 10:49 PM.


#5 bear15 OFFLINE  

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Posted June 24, 2018 - 12:02 PM

The spring looks great, pulleys look fine, I do not notice any issues. I put a new belt on and I have the same problem.

 

Any help appreciated.

 

 

I am not sure. Is this something that can be fixed? Do you know if there is any type of adjustment we can try?



#6 Cat385B OFFLINE  

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Posted June 24, 2018 - 04:31 PM

How much deflection do you have in the belt in it's longest space between two pullies? You shouldn't be able to push it out of alignment more than 2".

#7 bear15 OFFLINE  

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Posted June 24, 2018 - 09:15 PM

I would say approx. 2"

 

How much deflection do you have in the belt in it's longest space between two pullies? You shouldn't be able to push it out of alignment more than 2".



#8 bear15 OFFLINE  

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Posted June 25, 2018 - 08:49 PM

Any ideas?

I would say approx. 2"



#9 Cat385B OFFLINE  

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Posted June 25, 2018 - 10:07 PM

2" should be within spec. I would remove the belt, and spin each pulley individually to make sure it is free spinning and running true.
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#10 bear15 OFFLINE  

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Posted June 26, 2018 - 08:51 AM

Yes, I did this when I changed the belt. . . .

 

The spring looks great, pulleys look fine, I do not notice any issues. I put a new belt on and I have the same problem.

 

Any help appreciated.

2" should be within spec. I would remove the belt, and spin each pulley individually to make sure it is free spinning and running true.



#11 FixItCharlie OFFLINE  

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Posted June 26, 2018 - 11:32 AM

Check the blades for any side to side movement. The lower spindle bearings maybe worn causing the pulleys to move enough to throw the belt. Sometimes the only way to find this is checking on the blade side of the spindle. Check all the spindles as it only take one to be worn to cause this.

Charlie 


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#12 bear15 OFFLINE  

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Posted June 26, 2018 - 02:51 PM

Will do.

Check the blades for any side to side movement. The lower spindle bearings maybe worn causing the pulleys to move enough to throw the belt. Sometimes the only way to find this is checking on the blade side of the spindle. Check all the spindles as it only take one to be worn to cause this.

Charlie 



#13 bear15 OFFLINE  

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Posted June 26, 2018 - 08:58 PM

No side to side movement in the blades.

Check the blades for any side to side movement. The lower spindle bearings maybe worn causing the pulleys to move enough to throw the belt. Sometimes the only way to find this is checking on the blade side of the spindle. Check all the spindles as it only take one to be worn to cause this.

Charlie 



#14 FixItCharlie OFFLINE  

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Posted June 26, 2018 - 10:19 PM

My thought on this is as the blades are put under load of the heavier grass the spindle is allowing enough movement of the pulley to throw the belt. So checking for any movement of the spindle through the rotation could be the problem. Checking using the blades will give the leverage. So if the bearing even have one spot that is worn enough it would throw the belt. Pushing on one end of the blade towards the deck as it is rotated may find problem. Good luck finding what is causing this.

Charlie


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#15 Alc OFFLINE  

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Posted June 27, 2018 - 05:30 AM

Did it always throw the belt for you ?   Is there any adjustments to the deck front to back ? Maybe you could move the deck back further . When the belt come off does it give you any clues on where the problem might be , I would think the motor side would have a belt guard around the clutch that won't let it come off there 


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