O-Mac MF 2500 Manual page 60

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).
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– 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.