Model D19978H - 14 inch blade.
The chain should not be sagging from bottom of bar.when you tighten the chain push the nose of saw up so that all of the slack is out of the chain.chain should snap back in the bar if you pull the chain up and let go.when i adjust a chain i push the saw forward to make the bar go up and stay there while i tighten the nuts.hope this helps, let me know
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