Cutting Equipment; Spark Plug; Drive And Gearbox - Husqvarna LB 553S Operator's Manual

Cutting equipment

• Check the cutting attachment for damage or cracks. A
damaged cutting attachment should always be
replaced.
• Always ensure the cutter is well ground and balanced
correctly.
CAUTION! The blades should be balanced after
sharpening.
Damaged blades should be replaced when hitting
obstacles that result in a breakdown.
Replacing the blades
WARNING! Always wear heavy-duty
!
gloves when servicing and maintaining
the cutting equipment. The cutters are
very sharp and cuts can occur very
easily.
Dismantling
• Unscrew the bolt holding the cutter.
• Remove the old blade. Make sure the blade bracket is
free of damage. Also check that the cutter bolt is
undamaged and that the engine shaft is not bent.
Assembly
The blade must be mounted with the angled ends pointing
up towards the cover.
• Place the blade against the blade bracket. Make sure
the cutter centres correctly on the shaft. Place the
blade so that it is positioned at a 90 degree angle to
the key slot in the engine shaft.
MAINTENANCE
• Fit the spring washer and tighten the bolt and washer
correctly. The bolt must be tightened with a torque of
40 Nm.
• Pull the blade around by hand and make sure it
rotates freely.
• Test run the machine.
IMPORTANT!
Always exercise care and use your common sense.
Avoid all situations which you consider to be beyond
your capability. If you still feel uncertain about operating
procedures after reading these instructions, you should
consult an expert before continuing. Contact an
authorised service workshop.
Always use genuine parts. For more information, see
the "Technical data" section.

Spark plug

NOTICE! Always use the recommended spark plug
type! Use of the wrong spark plug can damage the
piston/cylinder.
• If the machine is low on power, difficult to start or runs
poorly at idle speed: always check the spark plug first
before taking other steps. If the spark plug is dirty,
clean it and check that the electrode gap is 0.7-0.8
mm. Replace if necessary.

Drive and gearbox

The centre belt runs between the engine shaft and the
gearbox.
Ensure the wheels and wheel axles are clean and free
from leaves, grass, etc. It is also important to keep clean
around the drive gearbox.
• Remove the protective cover by unscrewing the
screws.
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English 13