Husqvarna 331R Operator's Manual page 17

Maintenance schedule
Do a check of the blade that it is sharp and not damaged. Install the
blade to the center position correctly.
Do a check of the trimmer head.
Do a check of the cutting attachment and make sure that it does not
rotate at idle.
Do a check of the locknut of the cutting equipment.
Do a check of fuel leaks from the engine, tank or fuel lines.
Do a check of the transport guard for the blade.
Do a check of the nuts and screws.
Do a check of the starter rope handle and the starter rope.
Do a check of the vibration damping elementes.
Clean the external part and the adjacent areas of the carburettor.
Clean the external part of the spark plug. Remove it and check the
electrode gap. Adjust the distance to 0.6-0.7 mm or replace the spark
plug. Install a suppressor to the spark plug.
Clean the cooling system.
Do a check of the bevel gear lubricant. Fill if necessary.
Clean the muffler.
Do a check of the clutch, clutch springs and the clutch drum. Replace
if necessary by an approved service center.
Do a check of all cables and connections.
Replace the spark plug.
To adjust the carburetor
The basic carburetor settings are adjusted during testing
at the factory. Adjustment must be carried out by a
trained technician.
To do a check of the muffler
WARNING: Do not use a product that has a
defective muffler. Always replace a defective
muffler.
WARNING: Risk of burn or fire. Mufflers with
catalytic converters get very hot during
operation.
WARNING: Risk of fire. The muffler
decreases the noise level and identifies the
exhaust gases from the operator. The
exhaust gases are hot and can contain
sparks.
1158 - 005 - 26.03.2020
Daily
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CAUTION: The spark arrester screen must
be replaced if it is damaged. Do not use a
product if the spark arrester screen on the
muffler is missing or defective.
CAUTION: If the spark arrester screen is
blocked, the product will be too hot. This will
cause damage to the cylinder and piston.
1. Make sure that the muffler is not damaged.
2. Make sure that the muffler is correctly attached to
the product.
To adjust the idle speed
• Make sure that the air filter is clean. The cutting
attachment must not rotate in correct idle speed.
• Adjust the idle speed with the idle adjustment screw
T which is identified with "T" mark.
• The idle speed is correct when the engine operates
smoothly in all positions. The idle speed must be
below the speed when the cutting attachment starts
to turn.
Weekly Monthly
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