LAWN STAR LSB 3320, LSB 5243, LSB 4320 Operating Instructions Manual

MODELS :
LSB 3320
LSB 4320
LSB 5243

PETROL

BRUSHCUTTER

OPERATING

INSTRUCTIONS

Thank you for purchasing the Lawn Star Pro-Series petrol Brushcutter / Trimmer which is one of the

finest and most advanced products today’s technology can produce. Before you begin using it, please

read this manual carefully and familiarise yourself with the control and the proper use of this product
to ensure you get the best possible performance from it.

SAFETY PRECAUTIONS

Inspect your brushcutter / trimmer and all its parts before each operation. If any part is damaged or
worn, repair or replace before operation. Use only genuine Lawn Star (Pty) Ltd. replacement parts
when servicing or repairing the unit. These parts are available from your supplying dealer or service
agent. Have the brush cutter / trimmer repaired only by an authorised repairer. Use only genuine Lawn
Star replacement nylon cutting line 2.40 mm (Part No. 80-24000), never metal. Use only genuine
Lawn Star replacement blade discs and never fit blades larger than 260 mm diameter.
WARNING: Petrol and its vapours are highly flammable. Always stop the engine before refuelling.
Do not smoke or light any flames while refuelling. Wipe off any fuel that may have spilled. Start the
engine away from the place where it was refuelled. Ensure the tank cap is tightened properly. Return
the brushcutter / trimmer to its normal operating position before starting.
CAUTION: Exhaust fumes are toxic and asphyxiating. Inhalation may be lethal. Do not start the
engine in closed or poorly ventilated environments.

It is essential that the operator wears safety goggles, face shield, gloves, ear muffs, shoulder
harness, protective clothing and sturdy, non-slip footwear with toe-protector.

Do not use your brushcutter / trimmer for any jobs other than to cut brush, grass and weeds. Do not use
unless adequately guarded. Do not force your brushcutter / trimmer. If the engine labours, pull away
from brush / grass.
Do not operate brushcutter / trimmer without a line-trimming blade as over-extended line is dangerous
and will damage engine and invalidate warranty.
Use care in picking up or holding the unit. Always hold the brush cutter / trimmer with both hands. Do
not grasp the line-trimming blade located at the edge of the underneath side of safety guard.
Inspect the area to be cut and remove all debris that could be entangled in the cutting head. Also
remove any object that the unit may sling during cutting.
Avoid dangerous environments. Do not use the unit in poor light or in damp or wet locations. Do not
use in the rain. Do not use on steep slopes, especially if damp. Work across slope faces, not up and
down. Do not over-reach. Ensure good footing and balance is maintained.
Do not operate brushcutter / trimmer when tired, ill, or under the influence of alcohol, drugs or
medication.
Keep hands and feet clear of the rotating cutting head / blade while unit is in use. Cutting elements
continue to rotate for a few seconds after switch-off.
Do not allow children under 16, nor anyone who is not familiar with these instructions to use the
brushcutter / trimmer. Children, pets and onlookers should be kept at least 15 meters away from the
work area, unless shielded by an effective solid barrier.
Before storage allow the engine to cool. Store the unit indoors in a dry, ventilated and locked place, out
of reach of children.

PREPARATIONS FOR USE

Insert “Bull Horn Handles” into the bracket provided (Fig.1). Align the handles and tighten the 4 alum
bolts to lock handles into position. Fit the safety guard (Fig.23b) by tightening the 4 securing screws
provided with the guard. Fit tap-to feed cutting head or disc see section on fitting and changing cutting
heads

FUELLING

This product is equipped with a 2-stroke engine which requires 2-stroke lubricating oil to be pre-mixed
with petrol. Use only genuine Lawn Star 2-stroke engine oil (Part No. 90-20000) and use lead-free
petrol (Octane 95). Mix both thoroughly (as per fuel-mix ratio) in a separate container. Always prepare
the fuel-mixture and refuel the brushcutter / trimmer outside in a well ventilated environment (Fig.2).
Do not smoke! Do not use marine or automotive 2-stroke oil.
Fuel-mix ratio for normal 2-stroke engine oil - 1:25 (4%) e.g. 40 ml of oil per 1 litre of petrol

Always stop the engine before refuelling. Do not smoke or light any flames while refuelling. Wipe off
any fuel that may have spilled. Start the engine away from the place where it was refuelled. Ensure the
tank cap is tightened properly. Return brushcutter / trimmer to its normal operating position before
starting.

Fig 1

STARTING COLD ENGINE AND STOPPING

1. Switch the ON/OFF switch (Fig 3) to the “ON” position.

2. Lift the choke lever located to the right of the carburettor cover (Fig.4) and place it in the (H) Start
position.

3. Repeatedly press the primer bulb (Fig.5) 5-10 times until the fuel is pumped back to the tank
through the second transparent pipe (Fig.6).

4. Grip the throttle control handle by pressing the trigger lock-off lever (Fig.7-No1) with the palm of
the hand, then fully depress the throttle trigger (Fig.7–No2) with your fingers and simultaneously
push in the throttle lock-on button (Fig.7-No3) with your other hand.

5. While holding the throttle lock-on button down, release the throttle trigger. This wills lock-on the
throttle trigger so that both hands are free to start the engine.

6. Pull the starter cord 5 times fully, engine may start (Fig.8).

7. Set the carburettor lever to run (lll) (Fig.9)

8. Pull the starter cord (Fig.8) repeatedly until the engine starts and allow to run for a few seconds.

9. Depress the throttle trigger (Fig.7-No2) and the throttle lock-off button will release automatically.
The engine will idle and the clutch will disengage causing the cutting head to remain stationary.

10. To stop the engine switch the ON/OFF switch to the “OFF” position (Fig.10)

STARTING WARM ENGINE

Proceed as with cold engine start but with the choke lever in the run position lll (Fig.9)

OPERATING INSTRUCTIONS

When properly assembled with safety-guard, safety harness and cutting-head / blade, your unit will cut
unsightly weeds, brush and tall grass in those hard-to-reach areas along fences, walls, foundations and
around trees.
NOTE: Even with care, trimming around foundations, brick or stone walls, kerbs etc. will result in
above normal line wear. Avoid contact when using the steel cutting blade disc.

TRIMMING
For normal trimming, the trimmer cutting-head should be inclined at about 30 degrees to the lawn,
while cutting towards the left in a sweeping motion. Always cut away from the operator. Do not pull
trimmer in towards operator.

FENCE / FOUNDATION TRIMMING WITH LINE CUTTING-HEAD ONLY
Approach trimming around chain link fences, picket fences, rock walls and foundations slowly to cut
close without whipping line against the barrier. If the line comes into contact with rock, brick walls, or
foundations, it may fray as it wears. If line snags fencing, it may snap off.

TRIMMING AROUND TREES
Trim around tree trunks with a slow approach so line or blade disc does not contact bark. Walk around
the tree trimming from the right to the left. Approach grass or weeds with the tip of the line / edge of
blade disc and tilt cutting-head forward.

CUTTING-HEAD LINE FEED
As the cutting line wears and shortens the cutting performance is reduced. In order to maintain
optimum performance ensure that the cutting lines are fully extended. To extend additional line, tap the
centre of the cutting head lightly on the ground WHILE THE UNIT IS RUNNUNG AT MAX RPM.
The line will automatically lengthen. Excess line will be clipped off by the blade on the safety guard.
Note: Cutting line wears more rapidly if trimming against hard surfaces such as bricks, concrete or
asphalt. Extend line regularly to ensure optimum performance at all times.