Elem Garden Technic RIDER61-P Traduction Des Instructions Originales page 154

6.3.5 Dismantling, replacing and remounting the blade
try to repair them! ALWAYS USE MANUFACTURER'S GENUINE REPLACEMENT
BLADES BEARING THE SYMBOL!
SHARPENING THE BLADE
Check that the blade is sharpened properly and firmly fixed to the bracket.
-- - A badly sharpened blade pulls at the grass and causes the lawn to turn yellow.
-- - A loose blade causes unusual vibrations and can be dangerous.
WARNING!
All operations on the blade (dismantling, sharpening,
balancing, remounting and/or replacing) require a certain familiarity and
special tools. For safety reasons, go to a specialized centre if you do not
have the right tools or experience.
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Always wear work gloves when handling the blade.
Damaged or bent blades must always be replaced; never
Ref 111177 65Mn