Husqvarna 120 Operator's Manual page 22

To assemble the starter housing on the
product
1. Pull out the starter rope and put the starter in
position against the crankcase.
2. Slowly release the starter rope until the pulley
engages with the pawls.
3. Tighten the screws that hold the starter. (Fig. 96)
To clean the air filter
Clean the air filter regularly from dirt and dust. This
prevents carburetor malfunctions, starting problems,
loss of engine power, wear to engine parts and more
fuel consumption than usual.
1. Remove the cylinder cover and the air filter.
2. Use a brush or shake the air filter clean. Use
detergent and water to clean it fully.
Note: An air filter that is used for a long time can not
be fully cleaned. Replace the air filter regularly and
always replace a defective air filter.
3. Attach the air filter and make sure that the air filter
seals tightly against the filter holder. (Fig. 97)
Note: Because of different work conditions, weather or
season, your product can be used with different types of
air filter. Speak to your servicing dealer for more
information.
To do a check of the spark plug
CAUTION: Use the recommended spark
plug. Refer to
An incorrect spark plug can cause damage
to the product.
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 26 . (Fig. 98)
4. Replace the spark plug monthly or more frequently if
necessary.
22
Technical data on page 26 .
To sharpen the saw chain
Information about the guide bar and saw chain
WARNING: Use protective gloves 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
27 , 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)
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)
Accessories on page
930 - 003 - 06.03.2019