Depending to what model you have, the Sprocket cover tab (located on the round part of the sprocket cover) isn’t inserted into the saw body tab slot. Or your cahin is not tensioned properly. According to the manufacturer... "The adjusting block on the adjusting screw isn’t inserted into the adjusting hole on the guide bar. Reinstall and align the sprocket cover by first removing the sprocket cover from the saw. Turn tensioning screw on the sprocket cover counter-clockwise until it stops. Pull guide bar away from saw body to remove slack from chain. Insert sprocket cover tab into saw body tab slot and lower sprocket cover into guide bar bolt. Finger tighten guide bar nut onto guide bar bolt. Slowly push guide bar toward saw body until adjusting block on the adjusting screw drops into round adjusting hole on the guide bar. Securely tighten guide bar nut after properly tensioning saw chain." If these tips do not work, you may need a new chain. You can order an new chain on-line at www.masterparts.net. I hope this helps you!
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