Jonsered 70C 用户手册
English
– 15
SAFETY INSTRUCTIONS
Checking wear on cutting equipment
Check the chain daily for:
•
Visible cracks in rivets and links.
•
Whether the chain is stiff.
•
Whether rivets and links are badly worn.
We recommend you compare the existing chain with a new
chain to decide how badly the existing chain is worn.
chain to decide how badly the existing chain is worn.
When the length of the cutting teeth has worn down to only 4
mm the chain must be replaced.
mm the chain must be replaced.
Chain drive sprocket
The clutch drum is fitted with one of the following drive
sprockets:
sprockets:
A Spur sprocket (the chain sprocket is welded on the drum)
B Rim sprocket (replaceable)
Regularly check the degree of wear on the drive sprocket.
Replace if wear is excessive. Replace the drive sprocket
whenever you replace the chain.
Replace if wear is excessive. Replace the drive sprocket
whenever you replace the chain.
Bar
Check regularly:
•
Whether there are burrs on the edges of the bar. Remove
these with a file if necessary.
these with a file if necessary.
•
Whether the groove in the bar has become badly worn.
Replace the bar if necessary.
Replace the bar if necessary.
•
Whether the tip of the bar is uneven or badly worn. If a
hollow forms on the underside of the bar tip this is due to
running with a slack chain.
hollow forms on the underside of the bar tip this is due to
running with a slack chain.
•
To prolong the life of the bar you should turn it over daily.
How to avoid kickback
What is kickback?
The word kickback is used to describe the sudden reaction
that causes the chain saw and bar to jump off an object when
the upper quadrant of the tip of the bar, known as the kickback
zone, touches an object.
that causes the chain saw and bar to jump off an object when
the upper quadrant of the tip of the bar, known as the kickback
zone, touches an object.
!
WARNING! Most chain saw accidents
happen when the chain touches the
operator.
happen when the chain touches the
operator.
Wear personal protective equipment. See
instructions under the heading Personal
protective equipment.
instructions under the heading Personal
protective equipment.
Do not tackle any job that you feel you are
not adequately trained for. See instructions
under the headings Personal protective
equipment, How to avoid kickback, Cutting
equipment and General working
instructions.
not adequately trained for. See instructions
under the headings Personal protective
equipment, How to avoid kickback, Cutting
equipment and General working
instructions.
Avoid situations where there is a risk of
kickback. See instructions under the
heading Machine
kickback. See instructions under the
heading Machine
′s safety equipment.
Use the recommended protective equipment
and check its condition. See instructions
under the heading General working
instructions.
and check its condition. See instructions
under the heading General working
instructions.
Check that all the chain saw safety features
are working. See instructions under the
headings General working instructions and
General safety precautions.
are working. See instructions under the
headings General working instructions and
General safety precautions.
!
WARNING! Kickback can happen very
suddenly and violently; kicking the chain
saw, bar and chain back at the user. If this
happens when the chain is moving it can
cause very serious, even fatal injuries. It is
vital you understand what causes kickback
and that you can avoid it by taking care and
using the right working technique.
suddenly and violently; kicking the chain
saw, bar and chain back at the user. If this
happens when the chain is moving it can
cause very serious, even fatal injuries. It is
vital you understand what causes kickback
and that you can avoid it by taking care and
using the right working technique.