For your Husqvarna brushcutter to work optimally, make sure that the grass blade is sharp.
For this you will need:
Protective gloves: Always use them when handling cutting equipment
Single-cut flat file
Method:
Check each blade.
Use the file to sharpen the blade in a straight movement.
Turn the blade regularly.
Sharpen all edges equally to keep the balance.
WARNING: Always discard a blade that is damaged. Do not try to make a bent or twisted blade straight to use it again.