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621
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Al-Ko 621 [24/80] Maintenance and servicing

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. T

rees 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.

Содержание

Похожие устройства

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 d Limbing a Tree 4 3 Chain catch bolt Fig 8 e Bucking a Log Bucking is cutting a log into lengths It is important to make sure your footing is firn 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 finished cut by overbucking to meet the first cut When the log is supported on both ends as illustrated in Figure 14 cut 1 3 of that diameter from the topoverbruck Then make the finished cut by underbucking to meet the first 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 This chainsaw is fitted 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 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 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 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 6 Maintenance and Servicing 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 first 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 GB 7 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 fitted with a filter 19 to protect the inside of the unit from becoming dirty The filter is designed in such a way that under normal conditions it need only be brushed quickly from outside to clean it The filter can be dismantled and cleaned externally for instance with a blower in the event of heavy volumes of dust To do so loosen the filter cap 20 from its lock where shown using a screwdriver Fig 16 and remove the filter 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 dean the chain with clear water If the chain is not used again immediately it must be treated with service spray or a customary ant i corrosion s pray 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 fillhalf 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 refill the oil reservoir

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