My clutch fell off on my john deer 355D. I am able to install and get the belt on, but the bolt that holds it in keeps backing out.

Google the model number and parts (john deer lt110 parts- foe exampl) you should get a link to a parts supplier on their site you can click on various blow ups to order parta. A side benefit is that those blow ups show you how those systems go together

on the john deere web site

Hi Lee:
I'd be guessing that the secondary drive belt may be compromised.
Here's a link
http://www.shopgreendealer.com/John-Deere-Secondary-Deck-Drive-Belt-M95122.html
f you don't have a manual, they are available on-line free. Just google "John Deere F150 manual"

try this

Sounds like new belt is jammed or something is out of place. Turn by hand and find out where the problem is. You can tell where the belt is stuck or jammed. Pull the key before you mess with stuff underneath the unit. I installed my belt the wrong way on my unit and ruined a new belt and it would not shift.. The shifter rod could have been dislocated when you installed the belt also.

We don't help Rude, angry people.
How dare you ask for help and get mad when no one holds your hand?!?

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!!

Go to john deer dealer they should be able to print u of that diagram for you.

Need to know what series it is 120 240 and so on you can go to this web site and select the mower thats yours. once on this site choose your mower and you can get belt diagram there. there is also a Phone number if you can't find your mower. Thanks for using Fix-ya And rate this answer if it was helpful.
avid101
http://www.deere.com/en_US/ProductCatalog/HO/servlet/com.deere.u90785.cce.productcatalog.view.servlets.ProdCatProduct?pNbr=SKU21309&tM=HO&link=enav

This look like it would be hard but it only takes a few minutes to remove. First put it on jack stands and lock the clutch down to release the belt so you can slip it off the pully. Then there are only about 6 bolts and two control shafts pins and its is out. It make things simpler by removing the deck first.