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Why will my chain not tension properly when the chain adjusting screw is turned on my M Series (includes models M125, M150, M300 and M350) chain saw?

April 26, 2017adjusting chain includes models properly screw SERIES Tension turned

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Why will my chain not tension properly when the chain adjusting screw is turned on my M Series (includes models M125, M150, M300 and M350) chain saw?

1 Answer

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The adjusting block on the adjusting screw isnt 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.