Operation - Husqvarna 531RB Manual De Usuario

To attach the grass blade or the grass cutter
1. Align the hole on the cover and the groove on the
gearbox.
2. Attach the cover with the screw/screws. (Fig. 39)
3. Put the blade between holder (A) and holder (B).
4. Turn the output shaft to align one of the holes in the
holder (A) with the related hole in the gear housing.
5. Put the locking pin in the hole to lock the shaft.
6. Make sure that the drive disc and the support flange
engages correctly in the center hole of the blade.
(Fig. 40)
7. Tighten the nut with the socket wrench. Hold the
shaft of the socket wrench near the blade guard.
Tighten in the opposite direction to how the cutting
attachment rotates. Tighten it to a torque of 15-20
Nm.
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. 43)
• Examine the support flange for cracks. Replace the
support flange if it is damaged.
(Fig. 44)
• 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. 45)
• Examine the blade guard for damages or cracks.
Replace the blade guard if it has been hit or if it has
cracks.
(Fig. 46)
• Examine the trimmer head and cutting attachment
guard for damages or cracks. Replace the trimmer
907 - 003 - 23.04.2019
To install the 2-teeth blade in the guard
1. Install the blade in the transport guard. (Fig. 41)
To assemble the shoulder harness
1. Put the ring of the shoulder harness strap through
the hook (A) and attach it with the bolt.
2. Attach the hook (B) of the shoulder strap to the ring
(C) on the frame. (Fig. 42)
To adjust the shoulder harness
1. Stop the engine.
2. Put on the harness.
3. Adjust the shoulder strap to make the product weigh
equally on your shoulders.

Operation

head and cutting attachment guard if they have been
hit or if they have cracks.
(Fig. 47)
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.
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).
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