Bosch GKE 40 BCE 0.601.597.703 - Инструкция по эксплуатации - Страница 29

28

 | English 

1 609 92A 11D | (3.12.14)

Bosch Power Tools

When cutting and felling operations are being performed by 
two or more persons at the same time, the felling operations 
should be separated from the cutting operations 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 per-
son, strike any utility line or cause any property damage. If the 
tree does make contact with a 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 neces-

sary before cuts are started. The escape path should extend 
back and diagonally to the rear of the expected line of fall.

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 diame-

ter of the tree, perpendicular to the direction of fall. Make the 
lower horizontal notching cut first. This will help to avoid 
pinching either the saw chain or the guide bar when the sec-
ond notch is being made.

Felling back-cut:

 Make the felling back-cut (

Y

) at least 

50 mm higher than the horizontal notching cut. Carry out the 
felling back-cut parallel to the horizontal notching cut. Make 
the felling back-cut so that enough wood is left to act as a 
hinge. The hinge-wood keeps the tree from twisting and fall-
ing 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 the de-

sired direction or may rock back and bind the saw chain, 
stop cutting and switch the chain saw off. Use wedges (

Z

) 

of wood, plastic or aluminium to open the cut and drop the 
tree along the desired line of fall.

– When the tree does not begin to fall when the felling gets 

close to the hinge, remove the chain saw from the cut, 
switch off and make the tree fall by driving a wedge (

Z

) into 

the horizontal cut.

When the tree begins to fall, remove the chain saw from the 
cut (if not already taken place), stop the motor, and put the 
chain saw down. Leave the danger area via the retreat path 
planned. Be alert for overhead limbs falling and watch your 
footing.

Limbing a Tree (see figure K)

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 the 
figure. Branches under tension should be cut from the bottom 
up to avoid binding the chain saw.

Bucking a Log (see figures L – O)

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 sup-
ported by the use of limbs, logs or chocks. Follow the simple 
directions for easy cutting.

When the log is supported along its entire length, it is cut from 
the top (overbuck).

When the log is supported on one end, 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, cut 1/3 the diameter 
from the top overbuck. Then make the finished cut by under-
bucking the lower 2/3 to meet the first cut.

When bucking on a slope, always stand on the uphill side of 
the log. When “cutting through”, release the cutting pressure 
near the end of the cut without relaxing your grip on the chain 
saw handles in order to maintain complete control. 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 chain saw motor before moving from tree to 
tree.

Troubleshooting

The following chart lists problem symptoms, possible causes and corrective action, if your machine does not operate properly. 
If these do not identify and correct the problem, contact your service agent.



Warning: Switch off and remove plug from mains before investigating fault.

Problem

Possible Cause

Corrective Action

Chain saw fails to operate

Kickback brake is activated

Pull activation lever for kickback brake (hand 
guard) 

5

 back in position 



, so that the red dot 

26

is covered

Plug not connected

Connect plug

Mains socket faulty

Use another socket

Fuse faulty / blown

Replace fuse

Extension cable damaged

Try without extension cable

Chain saw operates intermit-
tently

Mains cable defective

Check mains cable and have it replaced, if required

External or internal wiring defect

Contact your Bosch Service Centre

On/Off switch 

3

 defective

Contact your Bosch Service Centre

OBJ_BUCH-716-005.book  Page 28  Wednesday, December 3, 2014  11:12 AM