1 Secure the saw
Turn off and cool the saw, remove the spark plug cap or battery, engage the chain brake, and clamp the bar in a vise without deforming it. Put on gloves.
2 Choose the correct file
Based on the chain pitch and profile, choose the file diameter and guide. The wrong diameter changes the tooth geometry and worsens cutting.
3 Mark the starting tooth
Mark the shortest or first tooth with a marker. Set the guide to the angle listed on the chain, often 30°, and hold the file in the prescribed position relative to the bar.
4 Sharpen all teeth equally
Push the file from the inside of the tooth outward, only in one direction. Make the same number of light strokes on each tooth on one side, then turn the saw and work the other side.
? Tip: If the teeth are very uneven, damaged by stone, or you can’t maintain the same angle, take the chain to machine sharpening.
5 Check depth gauges and tension
Use a gauge to check the depth gauges, and use a flat file to remove only the excess that protrudes above the gauge. Clean the chain, adjust the tension, and check with a gloved hand that it moves freely.
⚠ Warning: Too low a depth gauge causes aggressive bite and strong kickback. Without the proper gauge, do not lower the gauges by guesswork.