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After prolonged use, especially in sandy environments, the blade wears out. It should
then either be reground or replaced.
7.3.1
Loosening of the mower blade
Tilt the lawn mower to the side. Then jam the knife with a wooden slat so that it cannot
turn with the knife screw. Then remove this hexagonal screw and washer that attach
the knife and knife adapter to the crankshaft of the motor. You may need a torque
wrench to do so.
7.3.2
Sharpening of the mower blade
You can sharpen the knife by removing it and then sanding or filing the blade while re-
taining the original bevel as much as possible. It is very important that all sides of the
blade are ground evenly to avoid imbalances. An unbalanced blade can cause excessive
vibration and consequently damage the machine. Test the blade by balancing it on a
screwdriver handle. Continue sanding the heavier side until it is evenly balanced.
7.3.3
Replacement of the mower blade
Replace it only with a part approved by the manufacturer. The manufacturer is not lia-
ble for possible damage due to an asymmetrical knife or low material strength.
Refer to chapter #4 to obtain the replacement blade's type designation.
7.3.4
Installation of the mowing blade
Position the knife so that the marking embossed in the metal is visible downwards.
Align the washer above the knife and install the hexagonal screw. Pull the hexagonal
screw with 50 Nm Fixed torque.
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Lubricate all moving parts at least once a season with a light oil.
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All nuts and bolts must be checked regularly for correct torque.
Regularly check the blade and the blade support for cracks,
especially after you have grazed an object with the device.
Protect your hands with work gloves before touching the
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Replace it if necessary.
blade.
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