Husqvarna 420EL [17/28] General safety precautions
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Husqvarna 420EL [17/28] General safety precautions

Husqvarna 420EL [17/28] General safety precautions
GENERAL SAFETY PRECAUTIONS
English – 17
• Fold the knob back in to lock the tensioning.
Lubricating cutting equipment
Chain oil
Chain oil must demonstrate good adhesion to the chain
and also maintain its flow characteristics regardless of
whether it is warm summer or cold winter weather.
Never use waste oil! Using waste oil can be dangerous
to you and damage the machine and environment.
Filling with chain oil
• All our chain saws have an automatic chain lubrication
system. On some models the oil flow is also
adjustable. (27)
• A full reservoir is sufficient for 15 minutes of steady
use.
• Never use waste oil. This results in damage to the oil
pump, the bar and the chain.
• It is important to use oil of the right grade (suitable
viscosity range) to suit the air temperature.
• In temperatures below 0°C (32°F) some oils become
too viscous. This can overload the oil pump and result
in damage to the oil pump components.
• Contact your service agent when choosing chain oil.
Checking chain lubrication
Aim the tip of the bar at a light coloured surface about 20
cm (8 inches) away. After 1 minute running at full throttle
you should see a distinct line of oil on the light surface.
(28)
If the chain lubrication is not working:
• Check that the oil channel in the bar is not obstructed.
Clean if necessary. (29)
• Check that the groove in the edge of the bar is clean.
Clean if necessary. (30)
• Check that the bar tip sprocket turns freely and that
the lubricating hole in the tip sprocket is not blocked.
Clean and lubricate if necessary. (31)
If the chain lubrication system is still not working after
carrying out the above checks and associated measures
you should contact your service agent.
Chain drive sprocket
The drive system is fitted with a drive sprocket. (32)
Regularly check the degree of wear on the drive sprocket.
Replace if wear is excessive.
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.
Replace the saw chain if it exhibits any of the points
above.
We recommend you compare the existing chain with a
new 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.
Guide bar
Check regularly:
• Whether there are burrs on the edges of the bar.
Remove these with a file if necessary. (33)
• Whether the groove in the bar has become badly
worn. 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. (34)
• To prolong the life of the bar you should turn it over
daily. (35)
!
WARNING! Poor lubrication of cutting
equipment may cause the chain to snap,
which could lead to serious, even fatal
injuries.
!
WARNING! Most chain saw accidents
happen when the chain touches the
operator.
Wear personal protective equipment. See
instructions under the ”Personal
protective equipment” heading.
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.
Avoid situations where there is a risk of
kickback. See instructions under the
heading Machine′s safety equipment.
Use the recommended protective
equipment and check its condition. See
instructions under the headings
Technical data and General safety
precautions.
Check that all the chain saw safety
features are working. See instructions
under the headings General working
instructions and General safety
precautions.
Never use a chain saw by holding it with
one hand. A chain saw is not safely
controlled with one hand. Always have a
secure, firm grip around the handles with
both hands.

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