Stiga 7 Series Operator's Manual page 33

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. 24.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
go during cutting and the risk of the tree
being unstable after the branch has been cut.
When limbing, it is necessary to
leave the lower, larger branches to
support the trunk on the ground.
Remove the small branches with
a single blow (Fig. 25.A).
It is recommended to cut the tensioned branches
working from the bottom upwards to prevent
the chainsaw from bending (Fig. 25.B).
6.4.2.d Bucking the trunk
Bucking means sawing a tree trunk into logs.
It is essential to make sure your feet are
positioned firmly on the ground, and your weight
is distributed equally on both feet. If possible,
it is recommended to raise and support the
trunk using branches, logs or blocks of wood.
It is easier to saw a log using the
spiked bumper (Fig. 1.I):
1. plant the spiked bumper into the log and use
it as a pivot. Cut with an arched motion to
make the bar penetrate the wood (Fig. 26);
2. repeat several times if necessary, changing
the point where you plant the spiked bumper.
• Trunk lying on the ground
When the entire trunk is lying on the
ground, it is bucked from the top
down (overbucking) (Fig. 27.A).
– Cut up to half the diameter, roll the log
over and finish sawing on the other side.
• Trunk resting on one end only
When the trunk is resting on one end only:
– saw through 1/3 of the diameter from the
bottom up (underbucking) (Fig. 28.A);
– then perform the final cut, overbucking
to reach the first cut (Fig. 28.B).
• Trunk resting on both ends
When the trunk is resting on both ends:
– saw through 1/3 of the diameter from the
top down (overbucking) (Fig. 29.A);
– then perform the final cut, underbucking the
lower 2/3 to reach the first cut (Fig. 29.B).
• Sloping trunk
Always stand upstream when bucking
a sloping trunk (Fig. 30).
During the operation, to maintain control when
the cut is almost complete, reduce the bucking
pressure without removing removing your
hands from the machine hand grips. Take all
necessary precautions to prevent the machine
from coming into contact with the ground.
6.5 ADVICE FOR OPERATION
NOTE Avoid using the machine at full
power for the first 6- 8 working hours.
IMPORTANT Stop the machine (par.
6.6) when moving between work areas.
6.6 STOP
To stop the machine:
1. Release the throttle trigger lever (Fig.
12.B) and allow the engine to run at
idle speed for a few seconds.
2. Turn the switch (Fig. 11.C)
to the «O» position.
3. Wait until the chain is stationary.
When you have reduced speed
to a minimum, it will take a few
seconds for the chain to stop.
The engine may be very warm
immediately after it is shut off. Do not
touch. The engine can cause burn injuries.
EN - 12