Husqvarna 331R Operator's Manual page 18

WARNING: If the idle speed cannot be
adjusted so that the cutting attachment
stops, speak to the distributor or the service
center. Do not use the product until it is
correctly adjusted or repaired.
1. Turn the idle adjustment screw clockwise until the
cutting attachment starts to turn.
2. Turn the idle adjustment screw counterclockwise
until the cutting attachment stops.
Cooling system
The product has a cooling system to keep the work
temperature low.
The cooling system has:
E
A
• Fins on the flywheel (A)
• Cooling fins on the cylinder (B)
• Cylinder cover (C) (directs cold air over the cylinder)
• Muffler plate (D)
• Plate (E)
To clean the cooling system
WARNING: A dirty or blocked cooling
system causes overheating. It causes
damage to the piston and cylinder.
1. Clean the parts of the cooling system with a brush a
minimum of one time a week.
18
Air filter
• Clean the filter at intervals of 25 hours. Clean more
regularly if necessary.
• Set the choke control in the choke position.
To clean the air filter
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.
C
D
B
3. Remove the felt filter and the air filter.
4. Hit the palm of your hand lightly with the felt filter or
use air to clean the felt filter.
5. Do a check of the surface of the rubber seal.
Replace the filter on the rubber seal if it is damaged.
6. Clean the air filter with warm soap water.
7. Use Husqvarna two-stroke oil to put oil on the filter.
Make sure that you remove excessive oil before you
put the air filter back.
CAUTION: Always replace an air filter that is
damaged, very dirty or soaked with fuel.
CAUTION: Make sure to keep the felt
filter dry. Water causes damage to the
felt filter.
1158 - 005 - 26.03.2020