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Husqvarna 120 Mark II Manual

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To assemble the guide bar and saw
chain
1. Remove the spark plug cap from the spark plug
during assembly to prevent an accidental start.
2. Remove the bar nuts and the sprocket cover.
Remove the transportation guard (A). (Fig. 37)
3. Put the guide bar above the bar bolts. Steer the
guide bar to its most rear position. (Fig. 38)
4. Put on protective chainsaw gloves.
5. Lift the saw chain above the drive sprocket and
engage it in the groove on the guide bar. Start on the
top edge of the guide bar. (Fig. 39)
6. Make sure that the edges of the cutting links are
turned forward on the top edge of the guide bar.
7. Assemble the sprocket cover and steer the chain
adjuster pin to the hole in the guide bar.
8. Make sure that the drive links of the saw chain fit
correctly on the drive sprocket. Also make sure that
the saw chain is correctly engaged in the groove in
the guide bar.
9. Tighten the guide bar nuts with your fingers.
10. Tighten the saw chain by turning the chain
tensioning screw clockwise with the combination
wrench (Fig. 40). Tighten the saw chain until it does
not sag from below the guide bar, but you can turn it
easily by hand. (Fig. 41)
11. Hold up the end of the guide bar and tighten the bar
nuts with the combination wrench. (Fig. 42)
• Examine the chain tension frequently after you
assemble a new saw chain and until the saw
chain has been run-in.
• Examine the chain tension regularly. Correct
chain tension results in good cutting performance
and a long life.
To reset the chain brake
If the clutch cover is removed accidentally while the
chain brake is locked, the chain brake must be unlocked
so the clutch cover can be assembled without binding to
the clutch drum.
CAUTION: The chain brake spring is under
tension. Use care when resetting the chain
brake.
Note: Do not hold the brake band while attempting to
reset it.
1. Align the notches on the bar tool so that they fit over
the brake rotating link. (Fig. 43)
2. To reset the brake, rotate the link clockwise until it
stops. The front link will be in its downward rotated
position when the chain brake is unlocked. (Fig. 44)
(Fig. 45)
Operation
WARNING: Read and understand the safety
chapter before you operate the product.
To use fuel
CAUTION: This product has a two-cycle
engine. Use a mixture of gasoline and two-
cycle engine oil. Make sure to use the
correct quantity of oil in the mixture.
Incorrect ratio of gasoline and oil can cause
damage to the engine.
Fuel mixture ratio
The fuel mixture ratio for the gasoline and two-cycle
engine oil is 50:1 (2%)
Gasoline
Two-cycle engine oil
1 U.S. Gal. 77 ml (2.6 oz)
1 UK Gal. 95 ml (3.2 oz)
5 l 100 ml (3.4 oz)
To make the fuel mixture
1. Determine the correct quantity of gasoline and
engine oil (mixture ratio 50:1). Do not make more
than 30 days quantity of fuel mixture. See
To use
fuel on page 16
.
2. Add half of the gasoline quantity to a clean fuel
container with an antispill valve.
CAUTION: Do not use gasoline with
more than 10% ethanol concentration
(E10). This can cause damage to the
product.
CAUTION: Do not use gasoline with an
octane number less than 90 RON (87
AKI). This can cause damage to the
product.
Note: Use gasoline with a higher octane number if
you frequently use the product at continuously high
engine speed.
3. Add the full quantity of the two-cycle engine oil to the
fuel container.
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