Oilguard - Husqvarna K770 Workshop Manual

1. Remove the carburetor. See
carburetor on page 17 .
2. Push in the lower part of the throttle lock with a v-jaw
tongue-and-groove pliers.
3. Lift the lower part of the throttle lock and pull it out
from the pin.
4. Push out the spindle to the right side. Use a rod with
a diameter of .08–.01 in/2–2.5 mm and
approximately 4 in/10 cm in length.
6.16.2 To examine the throttle lock
The throttle lock operates correctly if the throttle is
locked at idle speed.
1. Make sure the throttle cannot be released until the
top handle is pressed.
62 - Repair and servicing
To remove the
6.16.3 To assemble the throttle trigger and throttle
lock
1. Install the throttle trigger from the carburetor
compartment. Make sure that the spring comes out
through the handle.
2. Push in the spindle from the left side.
3. Push the throttle lock onto the shaft. Push the
throttle lock into position.

6.17 OilGuard

6.17.1 Function
The OilGuard prevents the product from running with
incorrect fuel. For the OilGuard to operate, an oil
containing dye, "Husqvarna OilGuard oil", must be
added. Fuel analysis starts 10 seconds after startup and
continues for 50 seconds. If the OilGuard identifies
incorrect fuel, the engine speed limit is 3800 rpm.
A winding in the ignition module (1) gives electric current
to the OilGuard. The analysis unit has a light-emitting
diode (2). The light hits a light sensitive phototransistor
(3). The fuel flows between the diode and the
phototransistor. The OilGuard oil contains a yellow dye
which absorbs the light from the light-emitting diode. In
this mode, the product is operating as usual. If the
product is filled with clean gasoline or a different type of
1
2
651 - 001 - 27.06.2018