Husqvarna 535FBX Operator's Manual page 23

• Carburettor malfunctions.
• Starting problems.
• Loss of engine power.
• Unnecessary wear to engine parts.
• Too much fuel consumption.
Clean the air filter at an interval of 25 hours, or more
regularly if conditions are unusually dusty.
To clean the air filter
CAUTION: An air filter that is damaged, very
dirty or soaked with fuel must always be
replaced.
If you use an air filter for a long time, it cannot be fully
cleaned. Replace the air filter with a new one at regular
intervals.
1. Move the choke lever up, to close the choke valve.
2. Remove the air filter cover and remove the air filter.
3. Clean the air filter with warm soap water.
4. Replace the air filter if it is too dirty to fully clean it.
Always replace a damaged air filter.
5. Also clean the inner surface of the filter cover. Use
air or a brush.
6. Do a check of the rubber sealing surface. Replace
the filter on the rubber seal if it is damaged.
7. Make sure that the filter is dry before you assemble
it.
Two piece-shaft
Apply grease to the end of the drive shaft after each 30
hours of operation. There is a risk that the drive shaft
ends (splined coupling) on models with two-piece shafts
will seize if they are not lubricated regularly.
1301 - 003 - 20.11.2019
To do a check of the spur sprocket
The clutch drum has a spur sprocket that is welded on
the clutch drum.
• Regularly do a visual check of the degree of wear on
the spur sprocket. Replace the clutch drum with the
spur sprocket if there is too much wear.
To examine the cutting equipment
1. Make sure that there are no cracks in rivets and links
and that no rivets are loose. Replace if it is
necessary.
2. Make sure that the saw chain is easy to bend.
Replace the saw chain if it is rigid.
3. Compare the saw chain with a new saw chain to
examine if the rivets and links are worn.
4. Replace the saw chain when the longest part of the
cutting tooth is less than 4 mm/0.16 in. Also replace
the saw chain if there are cracks on the cutters.
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