Cobra QM4123 Owner'S Manual Download

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Starting and stopping the engine

Always check the oil level prior to use!

On engines with a dipstick, the oil level must always be
between the min. and max. On engines without dipstick the
oil must be visible to the edge on filler hole, when the engine
is in a horizontal position. Always use SAE-30 oil. Use only
unleaded 95 octane petrol. Never over-fill the gas tank.

Start

1. Set the throttle lever to the max position.
2. Pull the start cord to start the engine. See Fig. 7A.

Always feed the start cord back into the engine by hand.

3. Activate the trimmer activation handle. Fig. 8A.
4. Activate the self-propelled handle. Fig. 8B.

Stop

1. Release both clutch handles.
2. Set the throttle lever to the stop position.

Vibrations may travel up into the handle during
use. We therefore recommend taking a break,
every 2 hours.

Operating the machine

Remove all foreign objects from the work area before using
the machine. Stones, glass, branches and similar items may
damage the machine. Also check the bolts are tightened.

Start the motor as per the instructions above. Stand clear of
the machine’s moving parts.

Never attempt to move the machine in any way other than
intended for normal use while the motor is running.

KEEP A SAFETY DISTANCE OF 15 METERS.

The machine can work in almost any kind of vegetation. The
trimmer head turns clockwise which means that the machine
throws the grass out on the right side.

The machine has a low center of mass and large wheels.
This makes it suitable for working on slopes with a gradient
of up to 15%. Warning: Avoid driving on slopes steeper than
15%, as the engine in such case will lack lubrication which
can result in a damaged engine.

The machine workload should match the trimmer capacity.
This is ensured by always keeping the same steady RPM on
the trimmer head. Avoid downspin in RPM. A downspin in
the RPM on trimmer head can be a sign on overload.

Adjustment of the cutting height

Follow the adjustment procedure as shown in Fig. 10

It is possible to adjust the cutting height on the trimmer head
in several positions between 45-120 mm.

To adjust the trimmer height, you have to loosen the two 4
mm allen screws. Then you can adjust the trimmer head up
and down. Tighten both screws again once the required
cutting height is chosen.

Cleaning

The machine should be cleaned after use. Use a garden
hose to wash off soil and dirt. Remove the trimmer head from
the trimmer axel to remove wedged grass etc. from the rotor
shaft. The chassis number should only be cleaned with a
damp cloth to avoid unnecessary wear. Avoid using a high-
pressure washer during cleaning.

Changing the oil

The oil should initially be changed after the first 5 hours of
use, and thereafter once per year. Use an oil extractor kit.
1. Suck the oil up through the oil filler hole using the

syringe. Use the hose to reach the sump.

2.  Transfer the used oil to the container.
3.  Fill the engine with new SAE-30 oil.
4.  Check the oil level using the dipstick.

Remember to dispose of used oil in a safe way.

Oil and oil extractor kit are not included

Storage



If the machine is likely to be stored unused for prolonged
periods, follow the instructions below. This will ensure
longer machine lifetime.



Use a garden hose to wash off soil, grass and dirt.
Remove any grass, etc. from the shaft. The chassis
number should only be cleaned with a damp cloth to
avoid unnecessary wear. Avoid using a high-pressure
washer during cleaning.



Wipe the machine with a damp cloth so that all surfaces
are clean. Wipe the surfaces down with an oily cloth to
prevent rust.



Always store the machine in a dry, clean location.



Empty or run the machine until dry of petrol.

Troubleshooting

The motor will not start

1.  Check the spark plug.
2.  Check there is fresh petrol in the tank.
3.  See separate motor instructions for further

troubleshooting.

The motor is not running smoothly

1. Check there is fresh petrol in the tank.