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Why chain keep coming off?

I have a Husquvarna 245 and the chain keep running off the bar . I adjust to tighten and in 5 min. its back off. what could be causing and what can I do
bigge31566, May 2011
May be worn drive sprocket or the chainbar depth has become too shallow due to wear and chain is 'rideing' out or bent bar.

kEith IN CORNWALL, May 2011
link Click here to see other fixes for Husqvarna 245.