Loose chain, making various noises
If your chain spins around the bar but rattles or comes loose as it does so, the most likely solution is that you need to adjust the tension on the chain.
Adjust the tension after every 15 minutes of use, but never when the chainsaws is running or hot - the chainsaw needs to cool so that the metal in the chain will contract and give you a proper fit that will not bend your bar.
To tighten your chain, loosen the two saw bar nuts on the side of the saw. Hold the front of the saw blade slightly up and turn the tensioning screw with a flathead screwdriver. (Tensioning screws have different locations on different models of saws, including between the saw blade nuts, on the other part of the clutch cover, or on the power head next to the saw blade.)
Loosen the chain and tighten the chainsaw nut. Check that your chain is tight enough to lift it out of the bar slot - the drive should snap back into the slot when the chain is loosened. Push the chain along the bar with your screwdriver to check that it moves freely.
If your chain is properly tensioned but still sags, check the sprockets on the side of the saw for signs of wear or damage.
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Chainsaw cuts are slow
One of the most frustrating problems occurs when a chainsaw cuts but cuts slowly. If this happens, you may also notice that your saw is producing a lot of sawdust. This is not ideal; a chainsaw in top condition will produce small wood chips, not sawdust, when cutting.
Slow cutting chainsaws are a sign that you may need to sharpen or replace your chain.
Bent notches in the top of the chain after cutting
If your saw can't make a neat, straight cut, sharpening may again be the problem. However, bent notches may be a sign that your chain has been sharpened incorrectly. Resharpen your chain, taking care to file all the cuts to the same angle. Don't forget to control the depth at the same time!
Another problem that can cause crooked cuts occurs when the rails on either side of the chain groove of the bar are unevenly ground off. When this happens, your safest option is to replace your bar.
The Final Solution
If these quick maintenance and chainsaw repair tips don't solve your problem, your next step is to contact the seller's service center. These sellers' service professionals will be able to consider the steps you've taken and use their expertise to diagnose the problem or issue a replacement for the damaged part.
However, if your saw isn't working properly, don't be in a hurry to write it off as broken. Often, all it needs is a little troubleshooting to work smoothly and efficiently.