Ryobi RY5020 Manuel D'utilisation page 23

 When bucking on a slope, always stand on the
uphill side of the log. To maintain complete
control of the chain saw when cutting through
the log, release the cutting pressure near the
end of the cut without relaxing your grip on the
chain saw handles. Do not let the chain contact
the ground. After completing the cut, wait for the
saw chain to stop before you move the chain
saw. Always stop the motor before moving from
tree to tree.
BUCKING WITH A WEDGE
See Figure 25.
If the wood diameter is large enough for you to
insert a soft bucking wedge without touching the
chain, you should use the wedge to hold the cut
open to prevent pinching.
NOTE: When bucking or felling with a wedge,
you may need to remove the SAFE-T-TIP™ anti-
kickback device to allow the bar to be drawn
through the cut. After you complete the cut, reinstall
the tip.
BUCKING LOGS UNDER STRESS
See Figure 26.
Make the first bucking cut 1/3 of the way through
the log and finish with a 2/3 cut on the opposite
side. As you cut the log, it will tend to bend. The
saw can become pinched or hung in the log if you
make the first cut deeper than 1/3 of the diameter
of the log.
Give special attention to logs under stress to
prevent the bar and chain from pinching.
OVERBUCKING
See Figure 27.
Begin on the top side of the log with the bottom
of the saw against the log; exert light pressure
downward. Note that the saw will tend to pull
away from you.
UNDERBUCKING
See Figure 28.
Begin on the under side of the log with the top
of the saw against the log; exert light pressure
upward. During underbucking, the saw will tend
to push back at you. Be prepared for this reaction
and hold the saw firmly to maintain control.
OPERATION
OVERBUCKING
UNDERBUCKING
Page 23 — English
LOG SUPPORTED AT ONE END
FINISHING CUT
1ST CUT 1/3 DIA
LOG SUPPORTED AT BOTH ENDS
1ST CUT 1/3 DIA
LOAD
FINISHING CUT
LOAD
Fig. 26
Fig. 27
Fig. 28