Ryobi RY10521A Manual Del Operador página 21

NOTE: Before every cut, make sure the felling
direction line on the saw housing is aligned with
the desired path for the tree to fall.
 Cut a notch about 1/3 the diameter of the trunk
in the side of the tree. Make the notch cuts so
they intersect at a right angle to the line of fall.
This notch should be cleaned out to leave a
straight line. To keep the weight of the wood
off the saw, always make the lower cut of the
notch before the upper cut.
 Make the backcut level and horizontal, and at
a minimum of 2 in. above the horizontal cut of
the notch.
NOTE: Never cut through to the notch. Always
leave a band of wood between the notch
and back cut (approximately 2 in. or 1/10 the
diameter of the tree). This is called "hinge" or
"hingewood." It controls the fall of the tree and
prevents slipping or twisting or shootback of
the tree off the stump.
 On large diameter trees, stop the back cut
before it is deep enough for the tree to either
fall or settle back on the stump. Then insert soft
wooden or plastic wedges into the cut so they
do not touch the chain. Drive wedges in, little
by little, to help jack the tree over.
NOTE: When bucking or felling with a wedge, it
may be necessary 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 immediately.
 As tree starts to fall, stop the chain saw and put
it down immediately. Retreat along the cleared
path, but watch the action in case something
falls your way.
WARNING:
Never cut through to the notch when making a
back cut. The hinge controls the fall of the tree,
this is the section of wood between the notch
and backcut.
OPERATION
BACK CUT
®
WEDGE
Page 21 — English
PLANNED
LINE OF
FALL
FELLING
DIRECTION
LINE
HINGE
Fig. 23
TREE
Fig. 24a
Fig. 24b