IVT GCHS-25, Manual

Page: 14 / 76

14
EN
Instruction manual
material falls down under the force of gravity which can
cause danger of injury.
∙ The machine should be taken out of the cut only
when the saw chain (6) is still moving.
Felling trees [F13]
CAUTION! Always wear a hard hat to
protect you head from possible falling
branches.
∙ The machine may only be used to fell trees having
a diameter less than the length of guide bar (7).
∙
Fence off the working area.
∙
Never attempt to remove the machine that is stuck
in a trunk with the running motor. Use wooden blocks to
free the saw chain (6).
NOTE: the direction in which the tree has to fall, should
be determined before the work begins; it is important to
take into account the center of gravity of the crown of
the tree and the wind direction when determining the
direction.
∙ Saw a notch (A) in the direction of fall of the tree.
The depth of the notch should be approximately 1/3 of
the diameter of the trunk. Then continue the cut from
the opposite side to the notch (A) with a horizontal
cut (B), starting approximately 4 cm higher than the
previous cut (A).
CAUTION! Under no circumstances
should the trunk be completely sawn
through!
∙ Approximately 1/10 of the trunk’s diameter should
be left. If the tree starts to fall, remove the machine
immediately from the cut and move out of the way
backwards or to the side.
∙
The working area around the trunk must be free
from obstacles: sturdy support and the opportunity to
move out of the way without problem must be provided
for the operator.
∙
Once the saw cut has been finished, start felling the
tree by driving a wedge (C) into the horizontal cut (B).
∙
When the tree starts to fall, watch out for falling
branches and boughs that have been broken off.
Pruning of standing tree [F14]
∙ Cut up from the bottom, finish down from the top.
Limbing a tree [F15]
∙ Limbing a tree is the process of removing the
wrenches from a fallen tree. Do not remove supporting
limbs until after the log is bucked into lenghts. Branches
under tension should be cut from the bottom up to avoid
binding the chainsaw.
Cutting logs
∙ Place the log (timber) on a proper support and brace
it such that the machine does not get stuck in the cut.
∙ Short offcuts need to be accurately levelled and
reliably secured before they are sawn.
∙ Saw only wooden material. Avoid contact with
stones or dirt, since the saw chain (6) will throw them
sideways and in so doing the saw chain (6) could be
damaged.
∙
Do not touch wire fences or the ground with the
working machine.
∙
The machine is not suitable for cutting thin
branches and boughs.
∙
Longitudinal cuts should be carried out with great
care, since notched rest (8) cannot be used under these
conditions.
∙ When operating on slopes, always place yourselves
higher than the log to be sawn or to the side of it.
∙ Pay attention to the threat posed by stumbling
blocks, branches and roots, etc.
∙ If the log you wish to cut is lying on the ground,
saw down halfway, then roll the log over and cut from
the opposite side.
Cutting mechanically stressed timber [F16]
Branches, trees or timber that are mechanically stressed
or lost the pressure after cutting, can produce absolutely
unexpected reactions and cause serious injury or even
death. In such cases particular attention is required.
ATTENTION! Only specialists who
have undergone special training
should carry out such work.
∙
If the tree is supported from both ends (look to the
left side of the figure), the first cut should be made at
the top (A) to 1/3 the thickness of the trunk and then
finish the cut from below at the same place (B) whilst
avoiding splits and machine jams. It is essential that the
saw chain (6) will not be allowed to touch the ground.
∙ If the billet contacts the support from one end only
(look to the right side of the figure), start the cut from
below (A) about 1/3 of the diameter and finish the cut
from above (B). In this way trunk splitting and machine
jams are avoided.