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Hello. These mowers have a soft metal pin which breaks rather than break an expensive part. Check to see if you have broken a pin in the power takeoff or in the mower. J.
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Here's a link to an online John Deere parts store. When you land on the page, look at the top sub categories for the size of deck your mower has. You should be able to access a parts diagram with pictures of your belt's proper placement. http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
You do not say which size cutting deck you have. I will be writing about the 48", 3 blade cutting deck
The belt on this deck is self tensioned. The tension is provided by a spring attached to a moveable pulley on the deck. When the belt is in place you can manually force this pulley forward/backward and it will release the tension.
If the belt is off track, place the belt back around all the pulleys in the correct path, lastly force this spring loaded pulley forward/backward (depending on your deck, the direction is not important, the tension is) to get the belt around the pulley. If the belt is placed correctly, when you release the spring loaded pulley it will properly tension the belt.
Typically, these belts should not be jumping off. If yours is coming off frequently the belt may be worn. When they wear they get quite a bit longer, then the tension pulley cannot apply the correct tension. Rarely does the tension spring have to be replaced.
The other problem that causes belt jumping is worn spindles and stationary pulleys. The spindles are the most likely to need replacement. You can buy excellent replacements for JD spindles on Amazon for very reasonable prices. The following spindles are super replacement spindles for the 48" deck. They may very well be the same for smaller and larger decks; I have not researched that. Just search Amazon for Silver Streak # 285851.
Silver Streak # 285851 Spindle Assembly for JOHN DEERE GY21098, JOHN DEERE GY20962,
Product description:
Spindle Assembly / John Deere GY21098 Pack Size:1 JOHN DEERE GY21098, JOHN DEERE GY20962, JOHN DEERE GY20867, JOHN DEERE GY20454 OREGON 82-359, ROTARY 12910, ROTARY 11964 JOHN DEERE D100, D110, D130, D140,D150,D160, LA100, LA105, LA110, LA115, LA120, LA125, LA130,LA135, LA140, LA145, LA155, LA165, X110, X120, X140 Includes grease Zerk, pulley lock nut, blade lock nut, and washer , Height: 7 ", OD: 5 "
You can also find replacements for the flat pulleys on Amazon. If you cannot find what you need there, go to http://www.greenpartstore.com//
Most JD mower decks use a spring loaded tensioner on their belts. Make sure that the belt is threadded thru the pulleys the right way and you may find that considerable effort is required to set the tensioner in position. Be very careful to ensure that if the grip slips the spring flies away from you. I use the hook on a cargo strap to pull mine into position. Normally there is a similar tensioner on the drive belt for the wheels. This is more challenging to get to.
There are two things to check first. First is that you have the right belt on there and it is not worn. Second would be that all the springs are on the proper tensioning pulleys under the deck. After that then you need to look for an adjustable pulley that is manually tightened and held in place by a bolt. That will be your idler. You will also want to check the track of the belt to make sure nothing is bent.
The tractor has a cable connection and a tension spring that may have broken or has came off. It's hard to say for sure without seeing the mower or guiding someone over the phone as they are looking at things. If i can help further you or someone may call me at (831)578-4034 i live in California our time zone my be different.
L100 has a tension spring on them it may have broke or came off. If i can help any further you may call me and i will help you. I worked for john deere for several years. (831)578-4034 thanks wade
Hello. These mowers have a soft metal pin which breaks rather than break an expensive part. Check to see if you have broken a pin in the power takeoff or in the mower. J.
Unless there is some other means of placing tension on the deck belt, I would say that the idler pulley does. If the idler pulley is on a pivot arm, there is a spring that typically is attached to the pivot arm, near the pulley, that attaches to a post or some other part of the deck, that creates the tension on the belt. Check the belt for proper tension.
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