Stiga SP 386 Manual De Instrucciones página 32

To operate with the machine
proceed as described below:
• 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
handgrip and the right hand on the rear
handgrip, even if the operator is left-handed.
Stop the machine immediately
if the chain stops during sawing.
6.4.1 Checks to be conducted
whilst working
6.4.1.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).
6.4.1.b Checking the oil delivery
IMPORTANT Never use the machine
without lubrication! The oil tank may also
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. 19).
You can adjust the chain oil flow using a
screwdriver on the pump adjuster screw (Fig.
20.A) which is on the bottom of the machine.
This is the symbol that identifies
the oil pump regulator:
-
+
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
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. 21).
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
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. 22) 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. 23.A), point towards a target
on the ground in the direction in which
you intend to fell the tree (Fig. 23.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. 24.A).
• Felling back cut
4. Perform the felling back cut at least
5 cm higher than the horizontal
face notch (Fig. 24.B).