Release the chain brake. Remove the nuts/bolts that hold the right hand cover over the drive end of the bar. With the cover off, the bar will slide back toward the engine and allow the chain to be removed. Note the direction of the cutting teeth! Clean the side of the engine where the bar fits to, and the small oil passages in the bar drive end that run from the large holes out to the chain groove on each edge. Also clean the entire chain groove. Fit the new chain to the sprocket, then insert the bar and work the chain onto it. Pull out on the bar until the chain fits fairly tight, then fit the cleaned cover over the drive. You may have to change the position of the chain adjustment screw a few turns to allow the adjustment 'tang' to drop into one of the large holes in the bar. Make sure the cover is fully seated, then run the fasteners down finger tight. Turn the chain adjuster screw CW until the chain pulls up to the bottom edge of the bar, but not so tight that you can't turn the chain by hand. Tighten the fasteners fully and recheck chain tension. Start the engine and run the tip of the bar near some cardboard at speed for a moment or two--proper oiling is indicated by a thin line of oil thrown onto the cardboard. Be sure to keep the chain teeth sharp and properly adjust chain tension--don't allow it to droop when cutting. Hope this helps!
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