ensure minimum removal of material and even sharpness on all the cutting
edges.
If you sharpen the chain yourself, use special round-section files with the right
diameter depending on the type of chain (see "Chain Maintenance Table").
You need a certain amount of skill and experience to avoid damaging the
cutting edges.
Sharpen the chain as follows (Fig. 17):
• Secure the bar firmly, with the chain mounted, in a suitable vice.
• Tighten the chain if it is loose.
• Mount the file in the guide and then insert it in the tooth at a constant angle
from the cutting edge.
• Sharpen in a forward motion a few times and repeat this on all the cutting
edges facing the same way (right or left).
• To move the chain forward, use a screwdriver.
• Turn the bar over in the vice and repeat on all the other cutting edges.
• Check that the depth limiter tooth does not stick out farther than the
inspection tool and file any projecting parts with a flat file, rounding off the
edges (Fig. 17).
• After sharpening, remove all traces of filing and dust and lubricate the chain
in an oil bath. Replace the chain whenever:
- The length of the cutting edges decreases to 5 mm or less;
- There is too much play between the links and the rivets.
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