Blade Inspection And Replacement; How To Inspect And Replace The Blades - OREC AHRC 663 Operating Instructions Manual

Blade Inspection and Replacement

In order to work as safely as possible, perform an inspection of the blades before you start.
WARNING
When inspecting or replacing the blades, always to switch off the engine as there is a danger of injury.
When having the blades replaced or repaired, always have any such work performed by a person with
adequate tools and experience.
To avoid injury, wear safety gloves when performing inspection or replacement and wrap the tips of the
blades in cloth.
When replacing the blades, be sure to also replace the nuts and bolts which tighten the blades. This
prevents accidents caused by wear and tear on the nuts and bolts. Never use nuts and bolts that are
not recommended for this specified purpose.
Before using the machine, check for evidence of recent blade contact with foreign objects blade
bending, damage, and wear and tear.
If you neglect blade wear and tear, breakage, bending, and other damage, and continue to operate
machine, blades could snap and fly out, possibly severely injuring the operator or bystanders. Engine
fires can also be caused by abnormal vibrations.
When running the blades at high speed, vibration can be caused even if only 1 blade is missing or
broken. The machine cannot be operated safely in a continuous state of vibration, it is very dangerous.
Vibration can also cause damage such as cracks and breaks to each part of the machine.

How to inspect and replace the blades

Front Flappers set bolt
NOTICE
More frequent inspection the blades is necessary if using the machine on areas including dry earth and sand
which cause faster wear and tear of the blades.
We recommend purchasing spare blades in advance and keeping them in a safe location.
Use only the manufacturer's blades and blade attaching bolts.
Shaking of the blade drum is also a cause of vibration. In this case, the blade drum ASSY has to be
replaced as the blade drum can not be repaired.
Replace blades according to damage suffered. Please change all blades at the same time except in the
case that only 1 or 2 are damaged. Do not use old and new blades together as this will result in
abnormal vibrations.
1.
2.
3.
4.
Front Flappers
Stop the engine and remove the spark plug cap. (Refer
to page 16 for how to stop the engine)
Use the cutting height adjustment lever to raise the
blades to their highest position.
Raise the front flappers to inspect the blades for
breakage, bending, and wear and tear.
Remove the front flappers when replacing any abnormal
blades. To remove the front flappers, first remove the
front flappers set bolt. After finishing replacement work,
be sure to return the front flappers securely to their
original position.
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