Operation - Husqvarna 543RB Operator's Manual

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Introduction
WARNING: Before you operate the product,
you must read and understand the safety
chapter.
Before you operate the product
Examine the work area to make sure that you know
the type of terrain, the slope of the ground and if
there are obstacles such as stones, branches and
ditches.
Do an overhaul inspection of the product.
Do the safety inspections, maintenance and
servicing that are given in this manual.
Make sure that all covers, guards, handles and the
cutting equipment are correctly attached and not
damaged.
Make sure that there are no cracks at the bottom of
the grass blade teeth or by the center hole of the
blade. Replace the blade if it is damaged.
(Fig. 39)
Examine the support flange for cracks. Replace the
support flange if it is damaged.
(Fig. 40)
Make sure that the locknut can not be removed by
hand. If you can remove it by hand, it does not lock
the cutting attachment sufficiently and you must
replace it.
(Fig. 41)
Examine the blade guard for damages or cracks.
Replace the blade guard if it has been hit or if it has
cracks.
(Fig. 42)
Examine the trimmer head and cutting attachment
guard for damages or cracks. Replace the trimmer
head and cutting attachment guard if they have been
hit or if they have cracks.
(Fig. 43)
Fuel
To use fuel
CAUTION: This product has a two-stroke
engine. Use a mixture of gasoline and two-
stroke 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.
16

Operation

Husqvarna alkylate fuel
CAUTION: Do not use gasoline with an
octane number less than 90 RON (87 AKI).
This can cause damage to the product.
CAUTION: Do not use gasoline with more
than 10% ethanol concentration (E10). This
can cause damage to the product.
CAUTION: Do not use leaded gasoline. This
can cause damage to the product.
We recommend Husqvarna alkylate fuel for best
performance. This fuel gives less dangerous exhaust
fumes compared to regular fuel. It keeps the engine
clean and increases the engine life. Husqvarna alkylate
fuel is not available in all commercial areas.
Always use new unleaded gasoline with a minimum
octane number of 90 RON (87 AKI) and with less
than 10% ethanol concentration (E10).
Use gasoline with a higher octane number if you
frequently use the product at continuously high
engine speed.
Always use a good quality unleaded gasoline/oil
mixture.
Two-stroke oil
For best results and performance use Husqvarna
two-stroke oil, which is specially formulated for our
two-stroke engines.
If Husqvarna two-stroke oil is not available, you may
use another two-stroke oil of good quality that is
intended for air cooled engines.Contact your dealer
when you select an oil.
Do not use two-stroke oil intended for water-cooled
outboard engines, also referred to as outboard oil.
Do not use oil intended for four-stroke engines.
Gasoline, litre
5
10
15
20
Two-stroke oil, litre
2% (50:1)
0.10
0.20
0.30
0.40
825 - 010 - 11.05.2020

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