I don't know what else to say I put the belt on and go cut grass and all of a sudden I hear a noise and I look and belt flipps and you can see where its going to shed cause a chgunk has been taken out?
Check all the idlers, one might be bad
SOURCE: My John Deere JS25 is new, and suddenly running very loud
if its under warranty take it in for repair
SOURCE: blade belt diagram for John Deere LX178 Riding
Remember the belt rule, V of the belt goes in V pulleys.Flat pulleys that are stationary or move get the back of the belt. You can figure it out. Its not rocket science. Remember at some point there has to be a tensioner,usually gets the back of the belt if its a flat pulley. U may have to remove the spring and then reattach the spring after the belt is routed.
SOURCE: lawn mower keep cutting off when cutting the grass...
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please do not forget to rate me, Thanks
Good Luck, I hope this help
SOURCE: I need a belt routing diagram for a John Deere
If you go to this page http://manuals.deere.com/cceomview/OMGX21647_K3/Output/Index.html?tM=HO , scroll down the left side to the heading for your deck.
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