How To Tighten the Chain on a Chainsaw

Brandon:
Today we’re going to show you how to properly tension the chain on a Husqvarna 120 Mark II chainsaw.

What You’ll Need

• A scrench (chainsaw screwdriver/wrench tool)

Step 1: Locate the Tensioning Area

The chain tensioning screw is found on the side of the clutch cover. This is where you’ll adjust the chain.

Step 2: Loosen the Guide Bar Nuts

• Use the scrench to loosen the guide bar nuts on the clutch cover.

• Once loose, thread them gently back on by hand. This allows the bar to move as you adjust the chain.

Step 3: Adjust the Chain Tension

• While lifting the tip of the guide bar, insert the scrench into the tensioning screw.

• Turn the screw clockwise to tighten the chain and remove slack.

Step 4: Check Chain Movement

• Spin the chain by hand (while wearing gloves) to make sure it moves freely along the bar without sagging.

• The chain should be snug, but still able to glide smoothly.

Step 5: Re-Tighten the Bar Nuts

• Once the chain is properly tensioned, fully tighten the guide bar nuts with the scrench.

• Recheck chain movement one final time.

✅ Ready to Work

With the chain tension set, your Husqvarna 120 Mark II is properly adjusted and ready for safe, efficient cutting.