Ryobi+ RY18CS20A-0 - Инструкция по эксплуатации - Страница 6

6

Original Instructions

■

Charge the battery pack in a location where the ambient 
temperature is between 10°C and 38°C.

■

Store the battery pack in a location where the ambient 
temperature is between 0°C and 20°C.

INSTRUCTIONS CONCERNING THE PROPER 
TECHNIQUES FOR BASIC LIMBING AND CROSS-
CUTTING

UNDERSTANDING THE FORCES WITHIN THE WOOD

When you understand the directional pressures and 
stresses inside the wood, you can reduce the pinches or at 
least expect them during your cutting. Tension in the wood 
means the 

fi

 bres are being pulled apart, and if you cut in this 

area, the kerf or cut tends to open as the saw goes through. 
If a log is being supported on a saw-horse and the end is 
hanging unsupported over the end, tension is created on 
the upper surface due to the weight of the overhanging log 
stretching the 

fi

 bres. Likewise, the underside of the log is 

compressed and the 

fi

 bres are being pushed together. If a 

cut is made in this area, the kerf tends to close up during the 
cut. This cut would pinch the blade.

PUSH AND  PULL

The reaction force is always opposite to the direction the 
chain is moving. The operator must be ready to control the 
tendency for the product to pull away and push backwards. 
The product pulls away (forward motion) when cutting on 
the bottom edge of the bar. The product pushes backwards 
(towards the operator) when cutting along the top edge.

SAW JAMMED IN THE CUT

Turn o

ff

  the product, and remove the battery pack. 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, which forces 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 begin hopping or dangerously 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.

REMOVING BUTTRESS ROOTS

A buttress root is a large root extending from the trunk of 
the tree above the ground. Remove large buttress roots 
before 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 removing the large buttress roots. 

BUCKING A  LOG

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.

1

2

1/3

2/3

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 

fi

 rst cut.

2

1

2/3

1/3

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

LIMBING A  TREE

Limbing is removing the branches from a fallen tree. When 
limbing, leave larger lower limbs to support the log o

ff

  the ground. 

Remove the small limbs in one cut. Branches under tension 
should be cut from the bottom up to avoid binding the chainsaw.

SPRINGPOLES

A springpole is any log, branch, rooted stump, or sapling 
that is bent under tension by other wood so that it springs 
back if the wood holding it is cut or removed.