Manual Alpina ACS 2.2 ET (page 16 of 23) (All languages)

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USING THE MACHINE 11

• Felling back cut

– Make the felling back cut at least 50 mm higher

than the horizontal notching cut as illustrated

in Figure 16. Keep the felling back cut parallel

to the horizontal notching cut. Make the fell-

ing 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 sup-

port the log o the ground. Remove the small limbs

in one cut as illustrated in Figure 17. Bran ches

under tension should be cut from the bottom up to

avoid binding the chain saw.

WARNING! Be careful of where the

bran ches are lying on the ground, the risk of

them being under tension, the direction the

branch may go during cutting and the risk of

the tree being unstable after the branch has

been cut.

• Bucking a log

Bucking is cutting a log into lengths. It is important

to make sure your footing is 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

as illustrated in Figure 18A, it is cut from the top

(overbuck).

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

trated in Figure 18B, cut 1/3 the diameter from

the underside (underbuck). Then make the

nished cut by overbucking to meet the rst cut.

– When the log is supported on both ends, as

illustrated in Figure 18C, cut 1/3 the diameter

from the top (overbuck). Then make the nished

cut by underbucking the lower 2/3 to meet the

rst cut.

– It is easier to saw a log using the spiked bum per

(Figure 18D).

• Dig the spiked bumper into the log and use it

as a pivot. Cut with an arched motion to make

the bar penetrate the wood.

• Repeat several times if necessary, changing

the point where you plant the spiked bum per.

– When bucking on a slope always stand on the

uphill side of the log, as illustrated in Figure 19.

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. Al ways stop

the motor before moving from tree to tree.

3. END OF OPERATIONS

When you have nished your work:

– Switch off the engine as indicated above

(Chap. 6).

– Wait for the chain to stop and allow the machine

to cool.

– Remove any traces of sawdust or oil deposits

from the chain.

– If there is excessive dirt or resin build-up, dis-

assemble the chain and place it in a container

with a specic cleanser. Then rinse it with clean

water and treat it with a suitable anticorrosive

spray, before reassembling on the machine.

– Fit the bar cover before reassembling the ma-

chine.

WARNING! Allow the engine to cool

be f ore storing in any enclosure.

To reduce re hazards, clean the machine

thoroughly to get rid of any sawdust, branches,

leaves or excess grease, never leave contain-

ers with the cut debris inside the storage area.

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Alpina ACS 2.2 ET Manual

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