Ryobi RY10520 Manuel de l'opérateur télécharger pdf (Page 21)

Page 21 — English

WEDGE

Fig. 24

HORIZONTAL

CUT

VERTICAL

CUT

LOOSE

SECTION

Fig. 25

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.

REMOVING BUTTRESS ROOTS

See Figure 25.

A buttress root is a large root extending from the

trunk of the tree above the ground. Remove large

buttress roots prior to felling. Make the horizontal

cut into the buttress first, followed by the vertical

cut. Remove the resulting loose section from the

HINGE

BACK CUT

Fig. 23

OPERATION

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 40 41

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Ryobi RY10520 Manuel de l'opérateur Page 21

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