Ryobi RBC-52 Owner's Operating Manual page 13

Exercise extreme caution when using the blade
with this unit.
Blade thrust is the reaction which may occur when
the spinning blade contacts anything it cannot cut.
This contact may cause the blade to stop for an
instant, and suddenly "thrust" the unit away from
the object that was hit. This reaction can be violent
enough to cause the operator to lose control of the
unit. Blade thrust may occur without warning if the
blade snags, stalls or binds. This is more likely to
occur in areas where it is difficult to see the
material being cut. For cutting ease and safety,
approach the weeds being cut from the right to the
left, Fig.22.
In the event that an unexpected object or woody
stock is encountered, this could minimise the blade
thrust reaction.
BLADE
The blade is suited only for pulpy weeds and vines.
When the blade becomes dull, it can be turned
over to extend the life of the blade. Do not sharpen
the blade.
CUTTING TECHNIQUE - BLADE
WARNING. Extreme care must be taken
when using blades to ensure safe
operation. Read the safety information
for safe operation using the blade, refer
to "Specific Safety Rules for Brushcutter
and Blade Use" earlier in this manual.
Always hold brushcutter with both hands when
operating. Use a firm grip on both handles.
Maintain your grip and balance on both feet.
Position yourself so that you will not be drawn off
balance by the kick-back reaction of the cutting
blade.
Inspect and clear the area of any hidden objects
such as glass, stones, concrete, fencing, wire,
wood, metal, etc.
Never use blades near footpaths, fencing, posts,
buildings or other immovable objects.
Never use a blade after hitting a hard object
without first inspecting it for damage. Do not use if
any damage is detected.
The unit is used as a scythe, cutting from the right
to the left in a broad sweeping action from side to
side.
OPERATION
EXTENDING THE CUTTING LINE
Run engine at full throttle.
Tap the knob on hard, bare ground to advance line.
The line advances each time the knob is tapped.
Do not hold the knob on the ground.
NOTE: The line trimming cut-off blade on the grass
deflector will cut the line to the correct length,
Fig.23.
NOTE: If the line is worn too short you may not be
able to advance the line by tapping it on the
ground. If so, stop the engine and manually
advance the line.
TO ADVANCE THE CUTTING LINE MANUALLY
Stop the engine and disconnect the spark plug
wire. Push the spool retainer down while pulling on
cutting lines to manually advance the string.
GRASS DEFLECTOR LINE TRIMMING CUT-OFF
BLADE
The trimmer is equipped with a line trimming cut-off
blade on the grass deflector. For best cutting,
advance line until it is trimmed to length by the
cut-off blade. Advance the line whenever you hear
the engine running faster than normal, or when
trimming efficiency diminishes. This will maintain
best performance and keep the line long enough to
advance properly.
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Fig. 22
Fig. 23