Work Techniques - Stiga SP 386 Manual De Instrucciones

be empty every time the fuel runs out.
Make sure you top up the oil tank every
time you refuel the machine (par. 7.4).
Make sure the bar and the chain are
in place when you check the oil delivery.
Start the engine (par. 6.3), keep it running
at medium power and check if the chain
oil is delivered as shown in (Fig. 18).
You can adjust the chain oil flow using a
screwdriver on the pump adjuster screw (Fig.
19.A) which is on the bottom of the machine.
This is the symbol that identifies
the oil pump regulator:
-
+

6.4.2 Work techniques

6.4.2.a Delimbing a tree
Make sure there is nothing or nobody
in the area where the branches will fall.
1. Stand opposite the branch you want to cut.
2. Start cutting lower branches
followed by the higher ones.
3. Cut downwards to prevent the bar
from getting jammed (Fig. 20).
6.4.2.b Felling a tree
IMPORTANT Where two or more persons
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
Use a screwdriver
to turn it to the "+"
position to increase
the oil flow to the
chain; turn it to
the "-" position to
decrease the flow.
EN - 11
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. 21) which allow the operator
to escape to a safe zone, about 2.5 times
the height of the tree being felled;
– Stand upstream of the land onto which the
tree will probably roll or fall over after felling.
• Performing a face notch
1. Following the directional marks on the chain
saw (Fig. 22.A), point towards a target
on the ground in the direction in which
you intend to fell the tree (Fig. 22.B).
2. Stand to the right of the tree,
behind the chain saw.
3. Saw a horizontal face notch to 1/3 of the
diameter of the tree, perpendicular to the
direction in which it will fall (Fig. 23.A).
• Felling back cut
4. Perform the felling back cut at least
5 cm higher than the horizontal
face notch (Fig. 23.B).
5. Perform the felling back cut leaving
sufficient wood to act as a "hinge" (Fig.
23.C). The hinge wood will prevent the
tree from twisting and falling in the wrong
direction. Do not cut through the hinge.
6. Reduce the thickness of this hinge without
pulling out the bar, until the tree falls.
7. 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
before completing the felling back cut and
use some wooden, plastic or aluminium
wedges (Fig. 23.D) to open the cut. Force
the tree to fall along the desired line by
hitting the wedges with a sledge hammer.
8. When the tree starts to fall, it is necessary to
withdraw the machine from the cut, switch it
off (par. 6.6), lie it on the ground and take the
foreseen exit route. Beware of falling
branches and pay attention where you
put your feet.
6.4.2.c Limbing tree branches
Limbing means removing the
branches from a felled tree.
Be careful of where the branches are
lying on the ground, the risk of them being
under tension, the direction the branch may