AL-KO SOLO 621 - Инструкция по эксплуатации - Страница 24

GB-7

is equipped with a mechanical rundown brake. This 
brake is connected to the chain brake and stops the 
running chain after the chain saw has been switched off. 
It is activated by releasing the ON/OFF switch. The 
rundown brake avoids injuries through the coasting of 
the chain.

4.3.  Chain catch bolt  

(Fig. 8) 

This chainsaw is fi tted with a chain catch bolt (17). If the 
chain breaks when the saw is in operation, the chain bolt 
will catch the loose chain end and thus prevent injury to 
the operator‘s hand.

5. Instructions on working properly with the  

   chainsaw

 (Fig. 9 - 15)

a) Felling a Tree

When bucking and felling operations are being per-
formed by two or more persons, at the same time, the 
felling operation should be separated from the bucking 
operation by a distance of at least twice the height of the 
tree being felled. Trees should be felled in a manner that 
would endanger any person, strike any utility line, the util-
ity company should be notifi ed 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.

A retreat path should be planned and cleared as neces-
sary befor cuts are started. The retreat path should ex-
tend back and diagonally to the rear of the expected line 
of fall as illustrated in Figure 9.

Before felling is started, consider the natural lean of the 
tree, the location of larger branches and the wind direc-
tion to judge which way the tree will fall.

Remove dirt, stones, loose bark, nails, staples, and wire 
from the tree where felling cuts are to be made.

b) Notching Undercut 

Make the notch 1/3 the diameter of the tree, perpendicu-
lar to the direction of fall as illustrated in 10. Make the 
lower horiziontal notching cut fi rst. This will help to avoid 
pinching of either the saw chain or the guide bar when 
the second notch is being made.

c) Felling Back Cut 

Make the felling back cut at least 2 inches (50.8 mm) 
higher than the horizontal notching cut as illustrated in 
Figure 10. Keep the felling back cut parallel to the hori-
zontal 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 cut gets close to the hinge the tree should 
begin to fall. If there is any chance that the tree may not 
fall in the 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 aluminum 
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 fall-
ing and watch your footing.

d) 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 il-
lustrated in Figure 11. Branches under tension should be 
cut from the bottom up to avoid binding the chain saw. 

e) Bucking a Log 

Bucking is cutting a log into lengths. It is important to 
make sure your footing is fi m and your weigth 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 il-
lustrated in Figure 12, it is cut from the top (over-buck).
When the log is supported on one end, as illustrated in 
Figure 13, cut 1/3 the diameter from the underside (un-
derbuck). Then make the fi nished cut by overbucking to 
meet the fi rst cut.
When the log is supported on both ends, as illustrated in 
Figure 14, cut 1/3 of that diameter from the top overbruck. 
Then make the fi nished cut by underbucking to meet the 
fi rst cut.
When bucking on a slope always stand on the uphill 
side of the log, as illustrated in Figure 15. When “cut-
ting 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.

6. Maintenance and Servicing

Always  withdraw the plug when carrying out 

maintenance and servicing.

•  Always remove wood shavings and oil from your chain 

saw after use. The intake zone for motor cooling is 
fi tted with a fi lter (19) to protect the inside of the unit 
from becoming dirty. The fi lter is designed in such a 
way that, under normal conditions, it need only be 
brushed quickly from outside to clean it. The fi lter  can 
be dismantled and cleaned externally (for instance 
with a blower) in the event of heavy volumes of dust. 
To do so, loosen the fi lter cap (20) from its lock where 
shown using a screwdriver (Fig. 16) and remove the 
fi lter.

•  If the saw chain is particularly dirty, e.g. in case of 

gumming with resin, remove the chain and clean it. 
Place the chain for a few hours in a vessel containing 
chainsaw cleaner. There after clean the chain with 
clear water. If the chain is not used again immediately, 
it must be treated with service spray or a customary 
anti-corrosion-spray. 

•  Only in case of use of biological oil: As some biological 

oils may tend to incrustation after a time, the oiling 
system should be rinsed thoroughly before storing 
the chain saw for a longer period. Therefore, please 
fi llhalf of the oil reservoir (about 50 ml) with chainsaw  
cleaner and close it as usually. Then switch on the 
chainsaw - without bar and chain being mounted - 
and keep it running until the total rinsing liquid has 
evapurated through the oil opening of the chain saw. 
Before using the chain saw again, it is absolutely 
necessary to refi ll the oil reservoir.