Echo GRASS/WEED TRIMMER BRUSHCUTTER and CLEARING SAW - Manual (Page 17)

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The proper debris shield must be in place on the unit when nylon
cutting line is used.
a) Units with Echomatic TM semi-automatic line head must have a
debris shield with cut-off knife.
b) Units with manual feed line head or blade head require a
debris shield. Consult your operator’s manual for the proper
debris shield.
WARNING DANGER
The cutting line can flap around if too much line is exposed.
Always reinstall the plastic debris shield and cut-off knife
when converting the unit for use with a semi-automatic feed
type line head. A metal shield does not trim line.
For nearly all cutting, it is good to tilt the line head so that contact
is made on the part of the line circle where the line is moving away
from you and the debris shield. (See appropriate picture.) This
results in the debris being thrown away from you.
Tilting the head to the wrong side will shoot the debris toward you.
If the line head is held flat to the ground so that cutting occurs on
the whole line circle, debris will be thrown at you, drag will slow the
engine, and you will use up a lot of line.
WARNING DANGER
Use only ECHO quality nylon monofilament line of the
diameter given in your operator’s manual. Never use wire or
wire-reinforced line in place of nylon trimmer line. Load your
nylon line cutting head only with nylon trimmer line of the
proper diameter.
WARNING DANGER
Use extreme caution when operating over bare spots and
gravel, because the line can throw small rock particles at high
speeds. Debris shields on the unit cannot stop objects which
bounce or ricochet off hard surfaces.
STRAIGHT SHAFT
UNITS
CUT-OFF KNIFE ON
LEFT SIDE
If your unit has a straight shaft, line
head rotation is counterclockwise. The
knife will be on the left side of the debris
shield.
DEBRIS
CUT ON
THIS SIDE
COUNTERCLOCKWISE
ROTATION