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Husqvarna LB553Se Manual

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MAINTENANCE
14 – English
Maintenance
Note that the drive belts will set during the first running-in
period (5h) and it might be neccesary to adjust the
tension. See instructions:
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 air filter daily, or more often in demanding
conditions.
The air filter is dismantled once the air filter cover has
been lifted off. Press in the catches on the top of the air
filter cover and lower the cover.
Remove the air filter and check that it is undamaged.
Replace with a new air filter if you believe it to be
defective.
Clean the filter by knocking the filter carefully against a
hard surface and blowing with compressed air from
inside. Never brush the dirt away. Replace the air filter if it
is very dirty.
An air filter that has been in use for a long time cannot be
cleaned completely. The filter must therefore be replaced
with a new one at regular intervals.
A damaged air filter
must always be replaced.
When reassembling, make sure that the filter completely
seals against the filter holder.
Spark plug
If the machine is low on power, difficult to start or runs
poorly at idle speed: always check the spark plug first
before taking any further action. If the spark plug is dirty,
clean it and check that the electrode gap is 0.7-0.8 mm.
The spark plug should be replaced after about a month in
operation or earlier if necessary.
CAUTION! Always use the recommended spark plug
type! Use of the wrong spark plug can damage the piston/
cylinder.
Muffler
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.
Regularly check that the muffler is securely attached to
the machine. Never use a machine that has a faulty
muffler.
Cutter
It is important to have a sharp and correctly balanced
cutter. Loosen the bolt holding the cutter and leave the
cutter at a service workshop at least once a year for
grinding and balancing. An appropriate time to do this is
after the mowing season has finished.
If the cutter or cutter bracket need to be changed you
must replace the cutter bolt, washer and friction washer at
the same time.
The bolt should be tightened with a torque of 45-60 Nm
when you fit the cutter again. See instructions under the
heading Assembly.
If the cutter hits foreign objects such as stones, roots or
the like the cutter will slip against the cutter bracket. This
may mean that the contact surface of the cutter bracket
appears slightly worn, which is completely normal. This is
a safety device, which reduces the risk of the engine shaft
becoming bent.
!
WARNING! Make sure the cutting
attachment has stopped before cleaning,
carrying out repairs or an inspection.
Disconnect the spark plug cap from the
spark plug.
!
WARNING! The muffler gets very hot in
use and remains so for a short time
afterwards. Do not touch the muffler if it
is hot!
!
WARNING! Always wear heavy-duty
gloves when repairing the cutting
attachment. The blades are very sharp
and can easily cause cuts.
… 14 …


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