Husqvarna K 770 Operator's Manual page 23

OilGuard
Note: Applicable only to K 770 installed with OilGuard
(optional) and filled with a mixture of gasoline and
Husqvarna two-stroke oil.
• OilGuard is a built-in system that senses an incorrect
fuel mixture.
• When the product operates, a detector reads the fuel
mixture during 10 seconds. If the correct mixture is
used, the product operates at the correct speed. If
the incorrect mixture is used, the product decreases
the engine speed to 3800 rpm to prevent engine
failure.
• To make the product operate at the correct speed,
drain the incorrect fuel mixture. See
and two-stroke oil on page 22 . Fill the product with
the correct fuel mixture.
OilGuard oil
Use Husqvarna OilGuard oil when you use the OilGuard
system. OilGuard oil has a special color that is
necessary for the OilGuard system to work correctly.
To disengage the OilGuard
Note: A broken indicator pin shows that the OilGuard
system is disengaged. You cannot use a broken
indicator pin again to engage the OilGuard system.
The OilGuard plug (A) and a blue indicator pin (B) are
factory installed in the tank. The OilGuard lid (C) comes
as a spare part. If you do not have access to the
OilGuard oil, disengage the OilGuard system.
B
1. Remove the OilGuard plug (A) with a screwdriver.
2. Remove the blue indicator pin (B).
3. Install the OilGuard lid (C) in the tank.
To engage the OilGuard system
Note: You cannot use a broken indicator pin to engage
the OilGuard system again. You can get a new indicator
pin as a spare part. The spare part of the indicator pin is
grey to show that the OilGuard system has been
disengaged after the product left the factory.
1. Remove the OilGuard lid from the tank. Refer to
disengage the OilGuard on page 23
2. Attach a grey indicator pin to the OilGuard plug.
1447 - 001 - 16.04.2020
To mix gasoline
A
C
To
3. Install the OilGuard plug in the tank.
To fill fuel
CAUTION: Do not use gasoline with an
octane number less than 90 RON (87 AKI).
It causes damage to the product.
CAUTION: Do not use gasoline with more
than 10% ethanol concentration (E10). It
causes damage to the product.
Note: Carburetor adjustment is in some conditions
necessary when you change the type of fuel.
• Use gasoline with a higher octane number if you
frequently use the product at continuously high
engine speed.
1. Open the fuel tank cap slowly to release the
pressure.
2. Fill slowly with a fuel can. If you spill fuel, remove it
with a cloth and let the remaining fuel dry off.
3. Clean the area around the fuel tank cap.
4. Tighten the fuel tank cap fully. If the fuel tank cap is
not tightened, there is a risk of fire.
5. Move the product a minimum of 3 m (10 ft) from the
position where you filled the tank before a start.
To start the product with a cold engine
WARNING: Make sure that the cutting blade
can rotate freely. It starts to rotate when the
engine starts.
1. Make sure that the STOP switch is in the left
position.
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