IBEA IB 260, Safety And Operation Instruction

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Figure 8
C) CHECKING AND REPLACING THE BLADES
Always check the state of the blades before commencing work. Do not forget to switch the
engine off!
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During work operations if the blades (Fig. 9, ref. C ) strike stones or stumps stop
straightaway and make sure that they have not become bent or broken. Damaged
blades must be replaced.
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If the blades are very worn, cracked or bent, they make snap and project objects
outwards, risking serious accident.
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It requires specific experience and suitable equipment to replace and repair blades.
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Use heavy-duty work gloves to check or replace the blades to avoid risk of injury to
hands.
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As a rule
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unless there are only 1 or 2 blades
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all the blades must be replaced
simultaneously to avoid creating vibrations.
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The blades wear more quickly on dry, sandy ground. In these conditions they should
be replaced more frequently.
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It is advisable to keep spare blades handy.