Husqvarna 50 chain keeps coming off - Husqvarna Garden

If you recently swapped chains did you put on the correct pitch? Normally this saw uses a .325 chain; unless, someone has modified it to use .375 (3/8)

Are you adjusting the chain tension correctly?? Make sure the bar in installed correctly with the tension adjustment pin in the appropriate hole. Elevate the tip of the guide bar while adjusting the chain adjustment screw until the chain is snug but not tight. Then tighten the bar bolts without lowering the tip of the bar. Also ensure the drive links are engaging the sprocket correctly.

If the chain is adjusted correctly and the problem still exists, remove the sprocket side cover, bar and chain and inspect the sprocket for extreme wear. Once the sprocket is worn excessively it won't want to engage the drive links of the chain correctly which could be the source of the problem. If so, replace both the sprocket and the chain because the excess wear of the sprocket could have damaged the drive links of the chain and putting an old worn chain back on with a new sprocket will cause the new sprocket to begin wearing prematurely.