Question about Husqvarna Chain Saw 20" Bar

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When cutting, as it progresses, the cut curves to the rught automatically.

The bar appears straight and I recently sharpened the blade, though I'm new at that but tried to follow instructions. When sharpening, do I push the sharpener from the outside edge or the top edge right over the chain?

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Sharpening a chainsaw is an art. I wokred in the logging industry for 20 years before I was shown how to truly sharpen one well!

It appears that your problem has one of two causes.

1. Sorry, but you may not have filed the chain correctly, a common problem for newbies and some veterans. Ensure that all cutters are filed at the same angle (save your old chain and buy a new one for a quick solution). The file should be worked from the back of the tooth to the point ONLY. The file should be stroked at 90 degrees to the bar and parallel to the line that is inscribed on the tooth (if a line does in fact exist). Each raker should also be the same height - get a raker gauge from your chainsaw shop. If the rakers on one side of the chain are lower than the other side and/or the cutters are filed at significantly different angles on one side than the other the saw will cut in a curve.

If you look at the cutter from the side each one will show a quarter moon filing "circle" and both sides of the chain MUST be equal or close to equal. If one side has a moon and the other does not the saw will cut in a curve so severly it will bind in the cut.

2. A worn bar that is higher on one side of the chain groove than the other will also cause problems - a new bar is the only long term solution for this. The unequal height is caused by incorrect filing of the chain and long term use of the bar with this condition.

If the bar is in good condition and the rakers and cutters are filed properly you will not have to push on the saw to make it cut - it will pull itself through the wood. Indeed, before you buy a bigger saw to cut faster you should ensure correct filing - you may amaze yourself and your buddies!

I am a Certified Faller in the Province of British Columbia, Canada if you are wondering about my credentials.

Good Luck and Safe Cutting!

Doug Hough
Parson, B.C.

Posted on Jan 25, 2009

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