How do you replace the transmission chain on a Craftsman tiller model 917.293310?

To replace the transmission chain on a Craftsman tiller model 917.293310, first, ensure the tiller is powered off and disconnected from any power source. Remove the chain cover by unscrewing the bolts, then carefully take off the old chain from the sprockets. Install the new chain by threading it around the sprockets, ensuring proper alignment, and then replace the chain cover. Finally, check the tension and make adjustments as needed before testing the tiller.