Muffler; Cooling System; Air Filter - Husqvarna 343F Manuel D'utilisation

Muffler
CAUTION! Some mufflers are fitted with a catalytic converter.
See chapter on Technical data to see whether your machine is
fitted with a catalytic converter.
The muffler is designed to reduce the noise level and to direct
the exhaust gases away from the operator. The exhaust gases
are hot and can contain sparks, which may cause fire if directed
against dry and combustible material.
Some mufflers are equipped with a special spark arrestor
screen. If your machine has this type of muffler, you should
clean the screen at least once a week. This is best done with a
wire brush.
On mufflers without a catalytic converter the screen should be
cleaned weekly, or replaced if necessary. On mufflers fitted with
a catalytic converter the screen should be checked, and if
necessary cleaned, monthly. If the screen is damaged it
should be replaced.
If the screen is frequently blocked, this can be a sign that the
performance of the catalytic converter is impaired. Contact your
dealer to inspect the muffler. A blocked screen will cause the
machine to overheat and result in damage to the cylinder and
piston.
CAUTION! Never use a machine with a defective muffler .
WARNING! Mufflers fitted with catalytic
!
converters get very hot during use and remain
so for some time after stopping. This also
applies at idle speed. Contact can result in
burns to the skin. Remember the risk of fire!

Cooling system

To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
4
3
2
1 Air intake on the starter.
2 Fins on the flywheel.
3 Cooling fins on the cylinder.
4 Cylinder cover (directs cold air over the cylinder).
66 – English
MAINTENANCE
1
Clean the cooling system with a brush once a week, more often
in demanding conditions. A dirty or blocked cooling system
results in the machine overheating which causes damage to
the piston and cylinder.
Air filter
The air filter must be regularly cleaned to remove dust and dirt
in order to avoid:
• Carburettor malfunctions
• Starting problems
• Loss of engine power
• Unnecessary wear to engine parts
• Excessive fuel consumption.
Clean the filter every 25 hours, or more regularly if conditions
are exceptionally dusty.
Cleaning the air filter
Remove the air filter cover and take out the filter. Wash it clean
in warm, soapy water.
An oiled foam plastic filter (available as an accessory) must be
used if the machine is operated in extremely dusty conditions.
See instructions under the heading Oiling the air filter.
Oiling the air filter
Always use HUSQVARNA filter oil, art. no. 531 00 92-48.
The filter oil contains a solvent to make it spread evenly
through the filter. You should therefore avoid skin contact.
Put the filter in a plastic bag and pour the filter oil over it.
Knead the plastic bag to distribute the oil. Squeeze the
excess oil out of the filter inside the plastic bag and pour off
the excess before fitting the filter to the machine. Never use
common engine oil. This would drain through the filter quite
quickly and collect in the bottom.