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Drive Belt on my LT166 John Deere riding mower keeps breaking. WHY?

Changed end of last season broke first mow of the year. Also something is breaking blades on fan.

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2 Answers

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  • Master
  • 658 Answers

The bearings may be bad and freezing up, this will cause the belt to smoke and tear up. Does it smell like burning rubber ?? If not then you have a pulley out of line and or a pulley that's cracked or broken. Also check and make sure the deck pins are all in place and the locks are down on the quick release decks. Hope this helps, plese post solved on fixya.com.So I get credit for a solved problem if it does. If not, check back and give me more info.

Posted on Apr 18, 2014

Testimonial: "I will check for these problems thx I will get bk in touch."

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  • Garden Master
  • 2,478 Answers

Something in the space. Breaking the blades, a stick or etc.

Posted on Apr 18, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 83 Answers

SOURCE: belt broken on riding lawn mower (john Deere LT

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
This link will send you to the illustrated parts list on the john deere site. It shows the belt routing in the part diagram. Hope this solves your headache.

Posted on Mar 30, 2009

  • 1 Answer

SOURCE: John Deere Lt 166 ride on mower

jd lt 166 has 5 different decks
3 of which have the same belt routing
1st the belt needs to be adjusted correctly to stop it from "slacking off"
then on most decks the belt is routed in between the 2 small idler pulleys and then to the engine pulley
so let me know the deck i.e. 36", 42 ", 46", 48"
different belt sizes also
kendo

Posted on Jun 21, 2009

  • 1 Answer

SOURCE: need to replace belt on deck of john deere riding mower

does the belt on a 42" scotts lawnmower go behind the tenisoner or in front of it?

Posted on Jul 25, 2009

bargainbin2
  • 123 Answers

SOURCE: need a diagram on how to put a drive belt back on

It is a hard one to put on co look at the picture carefully there are two pulleys one that one side of the deck that are trickey.
7f123d5.jpg

Posted on Sep 01, 2009

  • 5 Answers

SOURCE: How to install a drive belt on a john deere 175

Photos and description available at
http://outdoorpowerinfo.com/repairs/deere_175_drive_belt.asp

Posted on Sep 04, 2009

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1 Answer

Why does the belt on my mower deck keep breaking?


if i had to guess, i would check and see if the pullys are alinged. Sounds as though you are getting a lot of heat damage or wear to break 3 in one season. I hope this helps you.

Aug 23, 2015 | John Deere L100 Series

1 Answer

We have purchased brand new john Deere, troy bilt and some other brand (I can't remember) lawn tractors over the last 5 years and they all go through about 3-5 belts from May to September. Each belt is...


What comes to mind is that the belts are being overly stressed on the new equipment. I can't imagine going through so many belts per season. Are the belts breaking or stretching? What are you mowing, High grass, weeds, and at what engine speed ? How low is the mower deck set? What tractor speed is used. Does the top of the deck become clogged with excessive amounts of clippings? Does the mower bog down and strain? These are all factors that can shorten the life of a belt.

May 17, 2014 | Garden

1 Answer

Mes now keep replacing with john deere parts, cant see any reason why, any ideas?


Maybe the drive belt is to small and pulling on the assembly, and in turn pulling enough to break the bolt. probably is fine when idle, but under load the condition changes, causing tension to be applied and snapping the bold. That would be the first place I would look.

I have also had other bolts come out of other assemblies and everything ran fine. Until one day when it didnt and belts snapped and so did bolts as and my transmission. It wasnt a good day. So check your belt alignments, mower deck bolts, spring placement, rear end bolts, etc. Good Luck!!

Jun 10, 2012 | John Deere 22HP VTwin 48" Riding Mower

1 Answer

I need to install a new drive belt on a GT 275 Belt broke while mowing. Got new belt but it is not obvious how it goes on.


lay under the mower and look for a diagram - there should be one somewhere on the unit.
Gary @ Fix Ya

Sep 19, 2010 | John Deere Hood Gt242gt262gt275 Garden...

1 Answer

I need a belt diagram for a lt166 john deere mower 48''deck


From the JD site, you can get the drive and deck belt diagrams here:

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt

***Don't forget to VOTE for the guys who take an interest in helping!

May 25, 2010 | John Deere Garden

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