Remove the bar nuts and take away the chainbrake cover, loop the chain over the sprocket and into the drive teeth, put the chain drive links into the guide bar rails, assemble the chainbrake back onto the saw, make sure the adjuster pawl sits into the adjuster hole in the bar, re attach the bar nuts loosly and adjust the chain tention, hold the tip of the bar up and tighten the bar nuts. If there is any burrs on the chain drive links they will have to be filed so as the chain runs free in the bar rails.
Husqvarna man, June 2010