Husqvarna 120 Manual De Usuario página 23

1. If the product is not easy to start or to operate
or if the product operates incorrectly at idle speed,
examine the spark plug for unwanted materials. To
decrease the risk of unwanted material on the spark
plug electrodes, do these steps:
a) make sure that the idle speed is correctly
adjusted.
b) make sure that the fuel mixture is correct.
c) make sure that the air filter is clean.
2. Clean the spark plug if it is dirty.
3. Make sure that the electrode gap is correct. Refer to,
Technical data on page 27 . (Fig. 98)
4. Replace the spark plug monthly or more frequently if
necessary.
To sharpen the saw chain
Information about the guide bar and saw chain
WARNING:
when you use or do maintenance on the
saw chain. A saw chain that does not move
can also cause injuries.
Replace a worn or damaged guide bar or saw chain with
the guide bar and saw chain combination recommended
by Husqvarna. This is necessary to keep the safety
functions of the product. Refer to
page 28 , for a list of replacement bar and chain
combinations that we recommend.
• Guide bar length, in/cm. Information about the guide
bar length can usually be found on the rear end of
the guide bar.
(Fig. 99)
• Number of teeth on bar tip sprocket (T).
(Fig. 100)
• Chain pitch, in. The distance between the drive links
of the saw chain must align with the distance of the
teeth on the bar tip sprocket and drive sprocket.
(Fig. 101)
• Number of drive links. The number of drive links is
decided by the type of guide bar.
(Fig. 102)
• Bar groove width, in/mm. The groove width in guide
bar must be the same as the chain drive links width.
(Fig. 103)
• Chain oil hole and hole for chain tensioner. The
guide bar must align with product.
(Fig. 104)
• Drive link width, mm/in.
(Fig. 105)
930 - 007 - 06.03.2023
Use protective gloves
Accessories on
General information about how to sharpen the
cutters
Do not use a blunt saw chain. If the saw chain is blunt,
you must apply more pressure to push the guide bar
through the wood. If the saw chain is very blunt, there
will be no wood chips but sawdust.
A sharp saw chain eats through the wood and the wood
chips becomes long and thick.
The cutting tooth (A) and the depth gauge (B) together
makes the cutting part of the saw chain, the cutter. The
difference in height between the two gives the cutting
depth (depth gauge setting).
(Fig. 106)
When you sharpen the cutter, think about the following:
• Filing angle.
(Fig. 107)
• Cutting angle.
(Fig. 108)
• File position.
(Fig. 109)
• Round file diameter.
(Fig. 110)
It is not easy to sharpen a saw chain correctly without
the correct equipment. Use Husqvarna file gauge. This
will help you to keep maximum cutting performance and
the kickback risk at a minimum.
WARNING:
increases a lot if you do not follow the
sharpening instructions.
Note:
Refer to To sharpen the saw chain on page 23
for information about sharpening of the saw chain.
To sharpen the cutters
1. Use a round file and a file gauge to sharpen the
cutting teeth. (Fig. 111)
Note:
Accessories on page 28
Refer to
for information about which file and gauge that
Husqvarna recommends for your saw chain.
2. Apply the file gauge correctly on to the cutter. Refer
to the instruction supplied with the file gauge.
3. Move the file from the inner side of the cutting teeth
and out. Decrease the pressure on the pull stroke.
(Fig. 112)
4. Remove material from one side of all the cutting
teeth.
5. Turn the product around and remove material on the
other side.
6. Make sure that all cutting teeth are the same length.
The force of the kickback
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