Echo RM-510ES Manual De Instrucciones página 38

Maintenance and care
4. Inspect cover and tap knob for wear.
When slot appears on bottom of the tap knob or when slot
appears on cover bottom close to outlet for nylon line, re-
place them with new parts without fail.
5. Check the cutting head for crack or chip.
Replace parts that show any crack or chip with new ones
without fail.
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