Makita DUC303 Manual De Instrucciones página 16

Bucking
1. Rest the bottom edge of the chain saw body on
the wood to be cut.
► Fig.24
2. With the saw chain running, saw into the wood
while using the rear handle to raise the saw and the
front one to guide it. Use the spike bumper as a pivot.
3. Continue the cut by applying slight pressure to the front
handle, easing the saw back slightly. Move the spike bumper
further down the timber and raise the front handle again.
NOTICE:
When making several cuts, switch the
chain saw off between cuts.
CAUTION:
If the upper edge of the bar is used
for cutting, the chain saw may be deflected in
your direction if the chain becomes trapped. For
this reason, cut with the lower edge, so that the
saw will be deflected away from your body.
► Fig.25
When you cut a wood under tension, cut the pressured
side (A) first. Then make the final cut from the tensioned
side (B). This prevents the bar from becoming trapped.
► Fig.26
Limbing
CAUTION:
Limbing may only be performed by
trained persons. A hazard is presented by the risk
of kickback.
When limbing, support the chain saw on the trunk if possible. Do
not cut with the tip of the bar, as this presents a risk of kickback.
Pay particular attention to branches under tension. Do
not cut unsupported branches from below.
Do not stand on the felled trunk when limbing.
Burrowing and parallel-to-grain cuts
CAUTION:
Burrowing and parallel-to-grain
cuts may only be carried out by persons with
special training. The possibility of kickback presents
a risk of injury.
Perform parallel-to-grain cuts at as shallow an angle as
possible. Take an extra caution when carrying out the
cut as the spike bumper cannot be used.
► Fig.27
Felling
CAUTION:
Felling work may only be per-
formed by trained persons. The work is hazardous.
Observe local regulations if you wish to fell a tree.
► Fig.28: 1. Felling area
— Before starting felling work, ensure that:
• Only persons involved in the felling operation
are in the vicinity;
• Any person involved has an unhindered path
of retreat through a range of approximately
45° either side of the felling axis. Consider the
additional risk of tripping over electrical cables;
• The base of the trunk is free of foreign
objects, roots and ranches;
• No persons or objects are present over a
distance of 2 1/2 tree lengths in the direction
in which the tree will fall.
— Consider the following with respect to each tree:
• Direction of lean;
• Loose or dry branches;
• Height of the tree;
• Natural overhang;
• Whether or not the tree is rotten.
— Consider the wind speed and direction. Do not
carry out felling work if the wind is gusting strongly.
— Trimming of root swellings: Begin with the largest
swellings. Make the vertical cut first, then the
horizontal cut.
— Stand to the side of the falling tree. Keep an area
clear to the rear of the falling tree up to an angle of
45° either side of the tree axis (refer to the "felling
area" figure). Pay attention to falling branches.
— An escape path should be planned and cleared
as necessary before cuts are started. The escape
path should extend back and diagonally to the rear
of the expected line of fall as illustrated in figure.
► Fig.29: 1. Felling direction 2. Danger zone
3. Escape route
When felling trees, follow the procedures below:
1. Cut a scarf as close to the ground as possible.
First make the horizontal cut to a depth of 1/5 -1/3 of the
trunk diameter. Do not make the scarf too large. Then
make the diagonal cut.
► Fig.30
NOTE: The scarf determines the direction in which
the tree will fall, and guides it. It is made on the side
towards which the tree is to fall.
2.
Make the back cut a little higher than the base
cut of the scarf. The back cut must be exactly horizon-
tal. Leave approximately 1/10 of the trunk diameter
between the back cut and the scarf. The wood fibers in
the uncut trunk portion act as a hinge. Insert wedges
into the back cut in time.
► Fig.31
WARNING:
under any circumstances. The tree will otherwise
fall unchecked.
NOTICE:
Only plastic or aluminum wedges may
be used to keep the back cut open. The use of
iron wedges is prohibited.
Carrying tool
Before carrying the tool, always apply the chain brake
and remove the battery cartridges from the tool. Then
attach the guide bar cover. Also cover the battery car-
tridge with the battery cover.
► Fig.32: 1. Guide bar cover 2. Battery cover
16 ENGLISH
Do not cut right through the fibers