Forestry Work; Delimbing A Tree; Felling A Tree - Stiga PR 500 Li 48 Manual De Instrucciones

– to have been specifically trained
to use this type of equipment;
– to have carefully read the safety
regulations and user instructions
contained in this manual;
– you practise first on logs on the ground
or attached to trestles, in order to
get familiar with the machine and the
most suitable cutting techniques.
To use the machine proceed as follows:
• Always disengage the chain brake, pulling the
lever towards you before using the throttle.
• The machine must always be firmly held in
both hands, with the left hand on the front
hand grip and the right hand on the rear hand
grip, even if the operator is left-handed.
Stop the machine immediately
if the chain stops during sawing.
NOTE During use, the battery is
protected against total drainage with a
protective device that switches off the
machine and stops it from working.
6.5.1 Checks to be conducted
whilst working
6.5.1.a Checking the chain tension
The chain tends to stretch gradually
as you work, so you need to check its
tension frequently (par. 6.1.3).
6.5.1.b Checking the oil delivery
IMPORTANT Never use the
machine without lubrication!
Make sure the bar and the chain are
in place when you check the oil delivery.
Start the motor (par. 6.4) and check if the
chain oil is spread as shown in (fig. 18).

6.6 FORESTRY WORK

6.6.1 Delimbing a tree

Make sure there is nothing or nobody
in the area where the branches will fall.
For pruning high up using a rope
and a belt harness, carefully follow
the instructions under par. 6.7.
1. Stand opposite the branch you want to cut.
2. Start cutting lower branches
followed by the higher ones.
3. Make first cut from the bottom towards the
top (Fig. 19.A). Complete delimbing by cutting
from top to bottom, as shown in (Fig. 19.B).

6.6.2 Felling a tree

IMPORTANT
are working together on felling and bucking
operations, such operations must be performed
in separate areas at a distance from each
other of at least 2.5 times the height of the tree
being felled. Do not fell trees if this involves
risks of injuring people, coming into contact
with a power line or causing any form of
damage. If the tree should come into contact
with a main power line, report the incident
immediately to the network provider.
Before commencing the felling operations:
– it is necessary to evaluate the natural
inclination of the tree, the part where the
branches are larger and the wind direction,
to assess how the tree will actually fall;
– remove any dirt, stones, pieces of
bark, nails, metal staples and wire;
– clear the area around the tree and
find a stable place to stand;
– plan obstacle-free escape routes at a 45°
angle back and away from the direction of
the fall (Fig. 20) which allow the operator
to escape to a safe zone, about 2.5 times
the height of the tree being felled;
– Stand uphill of the land onto which the tree
will probably roll or fall over after felling.
• Performing a face notch
1. Stand to the right of the tree,
behind the chainsaw.
2. Saw a horizontal face notch to 1/3 of the
diameter of the tree, perpendicular to the
direction in which it will fall (Fig. 21.A).
• Felling back cut
1. Perform the felling back cut at least
5 cm higher than the horizontal
face notch (Fig. 22.B).
2. Perform the felling back cut leaving
sufficient wood to act as a "hinge" (Fig.
22.C). The hinge wood will prevent the
tree from twisting and falling in the wrong
direction. Do not cut through the hinge.
3. Reduce the thickness of this hinge without
pulling out the bar, until the tree falls.
4. If there is any risk of the tree not falling
in the desired direction, or that it might
lose its balance moving backwards and
bending the toothed chain, stop cutting
EN - 11
Where two or more persons