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Step 1
Loosen the nuts on the sides of the chainsaw first when you need to tighten the chain. A wrench and screwdriver combination tool comes with a chainsaw, so make sure you use the correct size wrench for this job.
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Step 2
Adjust the screw. This screw is normally located on the inside of the bar of the chainsaw, next to the motor. This screw is called the "tension screw." It pushes the bar out when screwed in and lets the bar come back when it is screwed out.
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Step 3
Turn the screw clockwise in order to tighten the chain on your chainsaw. There should be about ¼-inch play between the chain and bar. In other words, you must be able to pull the chain down about ¼ inch below the bar. Too much tension heats the bar, causing the chain to stop moving. So it is critical not to get the chain too tight.
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Step 4
Tighten the two nuts on the side of the chainsaw to secure the bar to the saw after you have adjusted the tension of your chainsaw chain. Look to see that there is oil in your oil reservoir so the chain does not heat up. Most chainsaws have an automatic pump. When you crank the saw, you can see the oil coming off of the chain.
