A loose chain increases wear on drive sprockets, drive links and bar, and endanger the operator if it climbs out of the track. A chain that is too tight will increase wear on components.

When adjusting chain tension follow the manufacturer's instructions. General tips include:

• Shut off the saw.
• Wear gloves to avoid cuts.
• Loosen bar nuts.
• Rest tip of bar on small piece of wood to hold tip up.
• Tighten chain by turning adjustment screws until the chain is snug against the bar but able to be turned freely.
• Tighten bar nuts for correct chain tension by pulling on bar upwards with gloved hand or supporting it firmly from below.
• Check tension frequently and adjust as required.
• Ensure chain rotates smoothly after tensioning.

Clean out the chain-oil portal when maintaining the guide bar. Sawdust can block delivery of oil to the cutting chain. What should I know about chain brakes?

Always test the saw before cutting.

• Apply the chain brake with the saw held firmly in both hands and the engine running at operating power. If the chain does not stop running immediately, have the saw serviced.
• Remove the brake housing periodically and clean out any dirt, oil or sawdust.