Sharpening Metal Blades - Shindaiwa T242X Owner's/Operator's Manual

Remove Brushcutter Blade
1. Lock holder and output shaft.
2. Turn shaft bolt clockwise to remove.
3. Remove hex wrench.
4. Remove bolt guard, holder, clip, and blade.

Sharpening metal blades

Keep blades sharp and check blade condition frequently. If a blade's performance changes suddenly, stop
the engine and check the blade for cracks or other damage. Replace a damaged blade IMMEDIATELY!
WARNING!
■
Never repair a damaged blade by welding, straightening, or by modifying its shape. An altered blade
may break during operation, resulting in serious personal injury.
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, eg. 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.
T242X Trimmer
NOTE:
Flat File
Bottom
A
Do not
sharpen
beyond line A
Round off
the bottom of
each cutter
27
Cutter