What is the function of the chain tensioning screw?

What is the function of the chain tensioning screw?

• A. To change bar length
• B. To adjust and maintain proper chain tension on the bar
• C. To engage the chain brake
• D. To lubricate the chain

Answer: (B)

The function of the chain tensioning screw is to adjust and maintain proper chain tension on the bar. By loosening the bar nuts and turning the screw, you change how far the bar sits toward or away from the chain. Clockwise tightening pulls the bar toward the chain to increase tension; counterclockwise loosens it. After setting the tension, re-tighten the bar nuts and recheck so the drive links sit properly in the bar groove and the chain isn’t too loose or too tight. This helps prevent the chain from coming off, reduces wear, and ensures smoother cutting. It doesn’t change bar length, engage the chain brake, or lubricate the chain.

The function of the chain tensioning screw is to adjust and maintain proper chain tension on the bar. By loosening the bar nuts and turning the screw, you change how far the bar sits toward or away from the chain. Clockwise tightening pulls the bar toward the chain to increase tension; counterclockwise loosens it. After setting the tension, re-tighten the bar nuts and recheck so the drive links sit properly in the bar groove and the chain isn’t too loose or too tight. This helps prevent the chain from coming off, reduces wear, and ensures smoother cutting. It doesn’t change bar length, engage the chain brake, or lubricate the chain.