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Cause Cutting with loose chain, or wrong pitch sprocket
Solution Adjust chain tension. Install correct sprocket. File off burrs. Replace damaged drive links or replace chain
Front point turned up.
Cause Drive links bottoming in sprocket. Sprocket worn
Solution Replace sprocket. Sharpen tangs. Check for burrs
Scars on sides.
Cause Loose chain jumping off bar
Solution Adjust chain tension. Replace bent drive links or replace chain. Refile at correct angle
Battered and broken bottom.
Cause Chain jumped bar. Spur sprocket hit drive links
Solution Replace damaged drive links, sharpen tangs with round file or replace chain. Remove burrs
Front or back peened.
Cause Wrong pitch sprocket or prolonged chain chatter
Solution Replace sprocket. Adjust chain tension. Chain may be damaged beyond repair
Sides worn round at bottom.
Cause Chain wobbled in bar groove. Caused by uneven cutters or worn bar rails
Solution Rework bar rails and groove. Correct chain filing
A. Open Bar Groove B. Severe abrasion and wobbly chain on thin bar rails C. Rails not flat D. Wobbly chain, rails too thick E. One rail too thin or soft
Causes Uneven filing, worn bar rails cause chain to wobble
Solution File chain properly. Recondition bar rails or replace bar. Replace chain if necessary