Cause Wrong pitch sprocket or prolonged chain chatter.
Solution Replace sprocket. Adjust chain tension. Chain may be damaged beyond repair.
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. Refile at correct angle.
7
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.