Ayce KSB 400-37 Originalbetriebsanleitung Seite 75

Safe chainsaw operation
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 notified 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 as illustrated in
Figure BB.101.
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.
Notching undercut
Make the notch 1/3 the diameter of the tree, perpendicular to the direction of falls as illustrated in
Figure BB.102. 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.
Felling back cut
Make the felling back cut at least 50 mm higher than the horizontal notching cut as illustrated in
Figure BB.102. 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 chain saw from the cut, stop the motor, put the chain
saw down, then use the retreat path planned. Be alert for overhead limbs falling and watch your
footing.
Limbing a tree
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 as illustrated in
Figure BB.103. Branches under tension should be cut from the bottom up to avoid binding the
chain saw.
Bucking a log
Bucking is cutting a log into lengths. It is important to make sure your footing is firm 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 as illustrated in Figure BB.104, it is cut from the
top (overbuck).
When the log is supported on one end, as illustrated in Figure BB.105, cut 1/3 the diameter from
the underside (underbuck). Then make the finished cut by overbucking to meet the first cut.
When the log is supported on both ends, as illustrated in Figure BB.106, cut 1/3 the diameter from
the top (overbuck). Then make the finished cut by underbucking the lower 2/3 to meet the first cut.
When bucking on a slope always stand on the uphill side of the log, as illustrated in Figure
BB.107. When "cutting through", to maintain complete control release the cutting pressure near
the end of the cut without relaxing your grip on the chain saw handles. Don't let the chain contact
the ground. After completing the cut, wait for the saw chain to stop before you move the chain saw.
Always stop the motor before moving from tree to tree.
Figure BB.101-Description of felling: escape routes
148 149 GB