Black and Decker GK1740 Manual De Instrucciones página 22

ENGLISH
How the inertia activated chain brake works
The front guard/chain brake assembly (4) is activated when
the front hand guard is pushed forward, either manually, by
the back of the users hand or by its own weight. The
advantage of the inertia brake is that it is activated by a
severe kickback, e.g. When the chain (6) hits metal, even if
the users hand does not contact the front guard, i.e. when
the chainsaw is in the felling position.
How to test the anti-kickback chain brake (fig. C)
Grip the tool firmly in both hands on a firm surface make
sure the saw chain (6) is clear of the ground and switch on
(see" How to switch the chainsaw on").
Rotate your left hand forward around the front handle so
that the back of your hand comes in contact with the front
guard/chain brake assembly (4) and pushes it forwards,
toward the workpiece (fig. C). The saw chain (6) should
stop within a few fractions of a second
To reset after the operation of the front guard/chain brake
assembly (4):
Follow the instructions for "How to set the chain brake".
Note: It will not be possible to switch the tool on if the front
guard/chain brake assembly (4) is not in the "set"
position .
Note: Avoid re-starting the tool until you hear the motor
come to a complete rest.
Note: If the saw chain (6) does not come to rest immediately
then this indicates that it needs tensioning (see "Fitting the
guide bar and chain").
How to switch the tool on (fig. F)
Grip your chainsaw firmly with both hands. Push the lock-
off button (2) forward and then push the on/off switch (1) to
start.
When the motor starts, remove your thumb from the lock
button (2) and grip the handle firmly.
Do not force the tool - allow it to do the work.
It will do a better and safer job at the speed for which it is
designed. Excessive force will stretch the saw chain (6).
If the saw chain (6) or guide bar (7) becomes jammed:
Switch the tool off.
Disconnect the tool from the mains supply.
Open the cut with wedges to relieve the strain on the guide
bar (7). Do not try to wrench the chainsaw free. Start a fresh
cut.
Felling (fig. H - J)
Inexperienced users should not attempt to fell trees. The
user may suffer injury or damage to property as a result of
failure to control the direction of fall, the tree may splinter or
damaged / dead branches may fall during cutting.
22
The safe distance between a tree to be felled and
bystanders, buildings and other objects is at least 2 1/2
times the height of the tree. Any bystander, building or
object within this distance is at risk from being struck by the
tree when felled.
Before attempting to fell a tree:
Make sure that there are no local by-laws or regulations
that would prohibit or control the felling of the tree.
Consider all conditions that may affect the direction of fall,
including:
The intended direction of fall.
The natural lean of the tree.
Any unusual heavy limb structure or decay.
Surrounding trees and obstacles including overhead lines
and underground drains.
The wind speed and direction.
Pre-plan a safe exit from falling trees or branches. Make
sure that the exit route is clear of obstacles that would
prevent or hinder movement. Remember wet grass and
freshly cut bark is slippery.
Do not attempt to fell trees where the tree diameter is
greater than the cutting length of the chainsaw.
A direction notch is cut to determine the direction of fall.
A horizontal cut is made to a depth of between 1/5th and 1/
3rd of the diameter of the tree, perpendicular to the line of
fall at the base of the tree (fig. H). The second cut is made
from above to intersect with the first and make a notch of
about 45°.
Make a single horizontal felling cut from the other side 1-2
inches above the centre of the direction notch. (fig. I). Do not
cut through to the direction notch, you could lose control of
the direction of fall.
Drive a wedge or wedges into the felling cut to open it and
drop the tree (fig. J).
Pruning trees
Make sure that there are no local by-laws or regulations that
would prohibit or control the pruning of the tree limbs.
Pruning should only be undertaken by experienced users
there is an increased risk of the saw chain pinching and kick
back.
Before pruning consideration should be given to conditions
affecting the direction of fall including:
The length and weight of the branch to be cut.
Any unusual heavy limb structure or decay.
Surrounding trees and obstacles including overhead.
The wind speed and direction.
The branch being intertwined with other branches.