Normal operation of a chain saw causes vibrations that can loosen the blade, or chain saw bar nuts. Chains stretch during use and become loose on the blade, causing unsafe conditions for the operator. Proper operation of a chainsaw includes checking all nuts and bolts before and during use to ensure safety. If the blade nuts are loose on a Craftsman chain saw, you will most likely need to tension the chain correctly and then tighten the blade.
1. Put on leather gloves. Place the chain saw on a flat surface, such as a workbench or table, and allow the engine to cool completely if it was in use. Remove the spark plug wire from the spark plug to prevent accidental starts.
2. Stand in front of the chain saw facing the blade and chain. Grasp the tip of the chain saw blade with one hand and raise it. Insert a flat-head screwdriver or chain saw multi-tool into the adjustment screw that is on the right of the blade when you are facing the chain saw blade. This is the opposite of the operating position. Turn the screw clockwise to increase chain tension or counterclockwise to decrease chain tension.
3. Grasp the chain in one gloved hand and pull the chain around the blade. The tension is correct when the chain will pull around the blade and has a snug fit on the blade. Loosen or tighten the adjustment screw to obtain the correct fit.
4. Hold the tip of the chain saw blade up with one hand. Tighten both blade-retaining nuts on the left side of the chain saw with a chain saw multi-tool or an adjustable wrench. Place the spark plug wire on the spark plug and press it down firmly.
Things You Will Need
Chain saw multi-tool (optional)
A chain saw multi-tool is included with the purchase of a chain saw. It has a flat-head screwdriver on one end and a nut driver on the other that fits the blade nuts.
Wear personal protective gear when using a chain saw, including eye and hearing protection, leather gloves and a hard hat.
Operate a chain saw with another person in sight to call for help in the case of an emergency.