Ryobi RY36CSX35A-0 - Инструкция по эксплуатации - Страница 8

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Saw jammed in the cut

Stop the chainsaw 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 saw. Never try to start 

the chainsaw when the guide bar is already in a cut or kerf.

Skating/Bouncing

When the chainsaw fails to dig in during a cut, the guide 

bar can dangerously begin hopping or skidding along the 

surface of the log or branch, possibly resulting in the loss 

of control of the chainsaw. To prevent or reduce skating or 

bouncing, always use the saw with both hands. Make sure 

that the saw chain establishes a groove for cutting.

Never  cut  small,  fl exible  branches  or  brushes  with  your 
chainsaw.  Their  size  and  fl exibility  can  easily  cause  the 

saw to bounce towards you or bind up with enough force 

to cause a kickback. The best tool for that kind of work is 

a hand saw, pruning shears, an axe or other hand tools.

Felling a tree

When bucking and felling operations are being performed 

by two or more persons at the same time, the felling 

operations should be separated from the bucking operation 

by a distance of at least twice the height of the tree being 

felled. Trees should not be felled in a manner that would 

endanger any person, strike any utility line, or cause any 

property damage. If the tree does make contact with any 

utility line, the company should be notifi ed immediately.

The chainsaw 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 that are rotten or have been 

damaged  by  wind,  fi re,  lightning,  etc.  This  is  extremely 

dangerous and should only be completed by professional 

tree surgeons.

1.  Notching undercut

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.

2.  Felling back cut

Make the felling back cut at least 50 mm (2 inches) 

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 chainsaw from 

the cut, stop the motor, put the chainsaw down, then 

use the retreat path planned. Be alert for overhead 

limbs falling, and watch your footing.

1

3

2

5 cm (2 inch)

5 cm (2 inch)

Removing buttress roots

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 

fi 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.