You folks were helpful with my last problem, so I will try again with another.
The drive belt (which drives the blades) on my John Deere LA110 mower keeps slipping off one of the little pulleys.
I have bought new belts (on my third one in 4 years). That seems to work for a while (about 15-20 hours running) then it starts slipping off again.
Eventually it gets to the stage where the mower is un-usable (the belts slips off every few minutes) so I go and buy a new one and it all starts again.
I have tried tightening the belt, and loosening it (there is a small amount of adjustment available), but that doesn't seem to help. The belts get pretty chewed up after a while, which I guess makes them more likely to slip off.
Does anyone have any thoughts or similar experiences? I am considering trying to bend the lug on the pulley which is supposed to stop the belt slipping off (to make the gap smaller) but am nervous I might do more harm than good.