Maintenance - Husqvarna 129C Operator's Manual

To trim the grass
1. Hold the trimmer head immediately above the
ground at an angle. Do not push the trimmer line
into the grass. (Fig. 38)
2. Decrease the length of the trimmer line by 10-12
cm / 4-4.75 in.
3. Decrease the engine speed to decrease the risk of
damage to plants.
4. Use 80 % throttle when you cut grass near objects.
(Fig. 39)
WARNING:
safety chapter before you clean, repair or do
maintenance on the product.
Maintenance schedule
Make sure that you obey the maintenance schedule.
The intervals are calculated from daily use of the
product. The intervals are different if you do not use the
product each day. Only do the maintenance work that
is found in this manual. Speak to an approved service
center about other maintenance work not found in this
manual.
Weekly maintenance
• Clean the external surfaces.
• Examine the idle speed.
• Examine the bevel gear grease (straight shaft).
Monthly maintenance
• Examine the starter rope handle and the starter
rope.
Yearly maintenance
• Examine the spark plug.
• Apply grease to the end of the drive shaft (two-piece
shaft).
• Clean the external surfaces of the carburetor and its
adjacent areas.
• Clean the cooling system.
• Examine the spark arrester screen.
• Examine the fuel filter.
• Examine the fuel hose for damage.
• Examine all cables and connections.
50 hours maintenance
• Have an approved service center repair or replace
the muffler.
To adjust the idle speed
• Make sure that the air filter is clean and the air filter
cover is attached before you adjust the idle speed.
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Maintenance

Read and understand the
To cut the grass
1. Make sure that the trimmer line is parallel to the
ground when you cut the grass. (Fig. 40)
2. Do not push the trimmer head to the ground. This
can cause damage to the product.
3. Move the product from side to side when you cut
grass. Use full speed. (Fig. 41)
• 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.
1. Turn the idle adjustment screw clockwise until the
cutting attachment starts to turn. (Fig. 42)
2. Turn the idle adjustment screw counterclockwise
until the cutting attachment stops.
To do maintenance on the spark
arrester screen
Use a wire brush to clean the spark arrester screen.
(Fig. 43)
To clean the cooling system
Clean the parts of the cooling system with a brush.
(Fig. 44)
The cooling system include the air intake on the starter
(A) and the cooling fins on the cylinder (B).
To examine the spark plug
CAUTION:
spark plug. Make sure that the replacement
is the same as the manufacturer supplied
part. An incorrect spark plug can cause
damage to the product. Make sure that the
spark plug is installed with a supressor.
Speak to your servicing dealer for more
information.
1. Examine the spark plug when:
a) the engine is low on power.
b) the engine is not easy to start.
c) the engine does not operate correctly at idle
speed.
Use the recommended
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