MAINTENANCE SRM-2620U
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Sharpening Metal Blades
Several styles of metal blades are
approved for use on the Brush Cutter.
The 8-tooth blade can be sharpened
during normal maintenance. The
clearing blade and 80 tooth blade
require professional service.
Before sharpening, CLOSELY inspect
blade for cracks (look at the bottom of
each tooth and the center mounting
hole closely), missing teeth and
bending. If ANY of these problems
are discovered, replace the blade.
When sharpening a blade, always
remove the same amount of materials
from each tooth to maintain balance. A blade that is not balanced will cause
unsafe handling due to vibration and can result in blade failure.
1. File each tooth at a 30 degree
angle a specific number of times,
e.g., 4 strokes per tooth. Work
your way around the blade until
all teeth are sharp.
2. DO NOT file the ‘gullet’ (radius)
of the tooth with the flat file. The
radius must remain. A sharp
corner will lead to a crack and
blade failure.
If an electric grinder is used, use care not to overheat teeth, do not
allow tips/tooth to glow red or turn blue. DO NOT place blade in
cooling water. This will change the temper of the blade and could
result in blade failure.
3. After sharpening teeth, check
each tooth radius for evidence of
a square (sharp) corner. Use the
round (rat tail) file to renew the
radius.
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