Ryobi RCS5133CB 5133001860 - Инструкция по эксплуатации - Страница 8

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property damage. If the tree does make contact with any 
utility line, the company should be noti

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 ed immediately.

The chain saw operator should keep on the uphill side of 
the terrain as the tree is likely to roll or slide downhill after 
it is felled.
An escape path should be planned and cleared as 
necessary before cuts are started. The escape path should 
extend back and diagonally to the rear of the expected line 
of fall.
Before felling is started, consider the natural lean of the 
tree, the location of larger branches and the wind direction 
to judge which way the tree will fall.
Remove dirt, stones, loose bark, nails, staples and wire 
from the tree.
Do not attempt to fell trees which are rotten or have been 
damaged by wind, 

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 re, lightning, etc. This is extremely 

dangerous and should only be completed by professional 
tree surgeons.

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Notching undercut

See page 323 - 324.

Make the notch 1/3 the diameter of the tree, 
perpendicular to the direction of falls. Make the lower 
horizontal notching cut first. This will help to avoid 
pinching either the saw chain or the guide bar when the 
second notch is being made.

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Felling back cut

See page 323 - 324.

Make the felling back cut at least 50 mm/2 in higher 
than the horizontal notching cut. Keep the felling back 
cut parallel to the horizontal notching cut. Make the 
felling back cut so enough wood is left to act as a hinge. 
The hinge wood keeps the tree from twisting and falling 
in the wrong direction. Do not cut through the hinge.
As the felling gets close to the hinge, the tree should 
begin to fall. If there is any chance that the tree may 
not fall in desired direction or it may rock back and 
bind the saw chain, stop cutting before the felling back 
cut is complete and use wedges of wood, plastic or 
aluminium to open the cut and drop the tree along the 
desired line of fall.
When the tree begins to fall remove the product from 
the cut, stop the engine, put the product down, and 
then use the retreat path planned. Be alert for overhead 
limbs falling and watch your footing.

Removing buttress roots

See page 324.

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 

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 rst, 

followed by the vertical cut. Remove the resulting loose 
section from the work area. Follow the correct tree felling 
procedure after you have removed the large buttress roots. 

Push and pull

See page 325.

The reaction force is always opposite to the direction the 
chain is moving. Thus, the operator must be ready to control 
the tendency for the product to pull away (forward motion) 
when cutting on the bottom edge of the bar. Engage always 

firmly the bumper spike to avoid such movement. The 
product can be pushed backwards (towards the operator) 
when cutting along the top edge. To avoid this, make sure 
the chain is not jammed when cutting along the top edge.

Saw jammed in the cut

Stop the product and make it safe. Do not try to force the 
chain and bar out of the cut as this is likely to break the 
chain which may swing back and strike the operator. This 
situation normally occurs because the wood is incorrectly 
supported and forcing the cut to close under compression 
thereby pinching the blade. If adjusting the support does 
not release the bar and chain, use wooden wedges or a 
lever to open the cut and release the product. Never try 
to start the product when the guide bar is already in a cut 
or kerf.

Bucking a log

See page 325.

Bucking is cutting a log into lengths. It is important to 
make sure your footing is 

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 rm and your weight is evenly 

distributed on both feet. When possible, the log should be 
raised and supported by the use of limbs, logs or chocks. 
Follow the simple directions for easy cutting. When the log 
is supported along its entire length, it is cut from the top 
(overbuck).
When the log is supported on one end, cut 1/3 the diameter 
from the underside (underbuck). Then make the 

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 nished 

cut by overbucking to meet the 

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 rst cut.

When the log is supported on both ends, cut 1/3 the 
diameter from the top (overbuck). Then make the 

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 nished 

cut by underbucking the lower 2/3 to meet the 

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 rst cut.

When bucking on a slope always stand on the uphill side 
of the log. When “cutting through”, to maintain complete 
control release the cutting pressure near the end of the cut 
without relaxing your grip on the handles of the product. 
Don’t let the chain contact the ground. After completing the 
cut, wait for the saw chain to stop before you move the 
product. Always stop the engine before moving from tree 
to tree.

Limbing a tree

See page 326.

Limbing is removing the branches from a fallen tree. When 
limbing leave larger lower limbs to support the log off the 
ground. Remove the small limbs in one cut. Branches 
under tension should be cut from the bottom up to avoid 
binding the product.

Springpoles

See page 326.

A springpole is any log, branch, rooted stump, or sapling 
which is bent under tension by other wood so that it springs 
back if the wood holding it is cut or removed.
On a fallen tree, a rooted stump has a high potential of 
springing back to the upright position during the bucking 
cut to separate the log from the stump. Watch out for 
springpoles—they are dangerous. Do not attempt to cut 
bent branches or stumps which are under tension unless 
you are professionally trained and competent to do so.