Crown CT20101-18 Manual Original página 19

• When sawing short workpieces these must be fixed
securely (e.g. with the help of brackets).
Never saw logs lying in a pile or on the
ground, as this greatly increases the
recoil risk.
Sawing wood which is under mechanical pressure
(see fig. 14)
Branches, trees or wooden materials which stay
under mechanical pressure and can be released
due to sawing, are characterized by an absolutely
unpredictable response and cause severe or even
lethal injury. In such cases be especially cautious.
Such operations can be performed only
by trained and skilled specialists.
• If the workpiece is supported from both ends (see
fig. 14.1), the incision to 1/3 of thickness must be first
made from above (A), then the workpiece must be sawn
in the same location from below (B) to prevent splitting
the wood and jamming the cutting unit of the tool�
• If the workpiece contacts the support from one end
only (see fig. 14.2) an incision to 1/3 of the thickness
must be first made from below (C) and then be sawn
off completely in the same location from above (D)�
Thus splitting the wood and jamming the cutting unit
of the tool can be prevented�
Felling trees (see fig. 15)
• Always wear a protective helmet to protect the head
from falling brushwood�
• The tool can be used only for felling trees with the trunk
diameter less than the length of the tool's cutting unit�
Felling of thicker trees should be done by specialists.
• Fence the worksite off to prevent the presence of
other persons or animals on the worksite.
• Pre-determine the direction the tree will fall� This
factor is affected by the tilt and the curvature of the trunk,
the concentration of branches and the possible weight of
snow lying on them, wind direction, damage or rotting on
the trunk. It is very important to prevent a felled tree from
falling, for example, on the power lines, houses, cars etc�
• Consider and, if necessary, clear the paths for a safe
and unimpeded escape (see fig. 15.1). On fig. 15.1,
safe escape areas are marked with letter E, danger
areas are marked with letter F, the direction of the
fall is marked with a black arrow. Note: it is strictly
forbidden to be in the danger areas F at the time of
the tree falling, this can lead to serious injury, and
even death of the user.
• Remove the shoots under the tree, clear the lower
part of the tree trunk from small branches.
• Saw the guiding cut (G-H) (see fig. 15.2) in the
direction of the falling of the tree. First, make a slanting
cut (G) (at a tilt angle of not less than 45°) and then
a horizontal cut (H). The cut depth (G-H) should be
approximately equal to 1/3 of the tree diameter�
• Then, on the opposite side of the trunk, make a
horizontal cut (I), starting at approximately 50 mm
above the cut (H) (see fig. 15.3).
Note: the cut (I) must be parallel to the
cut (G-H) (see fig. 15.2-15.3). Under no
circumstances must the cut go through
the entire trunk of the tree!
• The distance between the cuts (I) and (GH) should
equal approximately one tenth of the tree trunk
diameter. If the tree starts falling, immediately remove
the cutting unit from the cut and leave it in the safe
direction (see fig. 15.1).
• If the tree did not fall after the cut (I) was made, its
fall must be initiated by hammering a wedge into the
horizontal cut (I).
• When the tree starts falling, you should immediately
and quickly move away in a safe direction (see
fig. 15.1), beware of falling and broken branches and
twigs�
Note: If the felled tree falls on the other
tree and is stopped by it, take extra care
when releasing it. Do not operate under
the suspended tree, do not saw off the
branches and twigs supporting the felled tree, as
it is extremely dangerous. Use a winch, or contact
specialists for help.
• Cutting of the branches on the felled tree is a very
complex operation. If you do not have proper skills,
contact a professional for help�
• When sawing off branches on a felled tree, comply
with all the above safety rules�
• Do not saw off branches when perched on the felled
tree trunk.
• Do not saw off branches that the felled tree trunk
rests on�
Tool maintenance / preventive measures
Switch off the tool before fulfilling all procedures.
Do not draw up the fastening elements
too tight to avoid damaging the thread.
Cleaning the tool
Clean the tool casing from sawdust and wooden
waste, purge the ventilation slots thoroughly� Blow
compressed air through the ventilation slots� Do not
use caustic substances or solvents for the cleaning of
the tool� Don't allow the handles to become oily�
Cleaning the cutting unit
Wear protective gloves while handling
the saw chain 2.
• Unmount the cutting unit of the tool as described
above�
• Remove the saw chain 2 from the guide bar 1�
• Brush off sawdust and small wooden chips from the
saw chain 2 and guide bar 1�
• Oil the saw chain 2 and guide bar 1 to protect them
against corrosion�
• If you plan to use the tool in the near future, install
the cutting unit as described above� Put protective
guard 19 on the cutting unit of the tool�
• If you plan not to use the tool for a long period of
time, do not install the cutting unit of the tool� Wrap
the chain blade 1 and saw chain 2 in oiled paper and
store them in a place protected from moisture and out
of reach of children�
English
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