Handleiding Bosch AKE 30-19S (pagina 24 van 153) (Nederlands, Duits, Engels, Frans, Italiaans, Portugees, Spaans, Deens, Zweeds, Noors, Fins)

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English - 24

24 • F016 L70 506 • TMS • 19.10.07

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.

➋ 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.

➌ 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 (X – W) 1/

3 the diameter of the tree, perpendicular to the direc-

tion of falls as 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 be-

ing made.

Felling Back Cut: Make the felling back cut (Y) at

least 50 mm 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 direc-

tion. 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, plas-

tic 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 over-

head limbs falling and watch your footing.

To complete the felling operation, drive a wedge (Z)

into the horizontal cut.

Beware of falling branches when the tree starts to

move.

Limbing a Tree

Limbing is removing the branches from a fallen

tree. When limbing leave larger lower limbs to sup-

port the log off the ground. Remove the small limbs

in one cut as illustrated. 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 impor-

tant 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, it is cut from the top (overbuck).

When the log is supported on one end, as illus-

trated, cut 1/3 the diameter from the underside (un-

derbuck). Then make the finished cut by overbuck-

ing to meet the first cut.

When the log is supported on both ends, as illus-

trated, 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. When "cutting

through”, to maintain complete control release the

cutting pressure near the end of the cut without re-

laxing 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.

Before any work on the machine itself, pull

the mains plug from the socket.

Note: To ensure long and reliable service, carry out

the following maintenance regularly.

Regularly check for obvious defects such as loose,

dislodged or damaged chain and chain bar, loose

fixings and worn or damaged components.

Care has to be taken that the chain is loosened with

the chain tensioning ring 13 before disassembly of

the chain. Forgetting to loosen can damage the

SDS mechanism.

Check that covers and guards are undamaged and

correctly fitted. Carry out necessary maintenance or

repairs before using the chain saw.

If the chain saw should happen to fail despite the

care taken in manufacturing and testing, repair

should be carried out by an authorized customer

service agent.

Before returning, ensure all oil in the oil tank has

been emptied by removing the sieve during emp-

tying. Replace sieve.

For all correspondence and spare parts orders, al-

ways include the 10-digit part number (TYP) from

the nameplate of the machine!

Fit the chain and chain bar as described in “Assem-

bly and Tensioning Chain”.

The circular groove of the chain bar will wear partic-

ularly on the lower edge with time. When replacing

the chain turn the chain bar 180° to allow even wear,

thus extending chain bar life.

Maintenance

Replacing/Changing Chain

and Chain Bar

F016 L70 506 - GB Seite 24 Dienstag, 23. Oktober 2007 3:20 15

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