Husqvarna 443RB Operator's Manual page 8

To attach and remove the locknut
WARNING: Stop the engine, use protective
gloves and be careful around the sharp
edges of the cutting attachment.
A locknut is used to attach some types of cutting
attachments. The locknut has a left thread.
• To attach, tighten the locknut in the opposite
direction to the direction of turning of the cutting
attachment.
• To remove the locknut, loosen the locknut in the
same direction as the cutting attachment rotates.
• To loosen and tighten the locknut, use a socket
wrench with a long shaft. The arrow in the picture
shows the area where you can operate the socket
wrench.
WARNING: When you loosen and
tighten the locknut, there is a risk of
injury from the blade. You must always
make sure that the blade guard prevents
injury to your hand when you do this.
Note: Make sure that you can not turn the locknut by
hand. Replace the nut if the nylon lining does not have a
resistance of a minimum of 1.5 Nm. The locknut must be
replaced after it has been put on approximately 10
times.
Cutting equipment
Choose and maintain the cutting equipment to:
• Obtain maximum cutting performance.
• Increase life span of the cutting equipment.
• Follow the checking, maintenance and service
instructions for the muffler.
• Always use the recommended guard for the cutting
equipment. See Technical data.
8
WARNING: Only use cutting attachments
with the guards we recommend! See the
chapter on Technical data. Refer to the
instructions for the cutting attachment to
check the correct way to load the trimmer
line and the correct trimmer line diameter.
WARNING: A faulty cutting attachment may
increase the risk of accidents.
WARNING: Always stop the engine before
doing any work on the cutting attachment.
This continues to rotate even after the
throttle has been released. Ensure that the
cutting attachment has stopped completely
and disconnect the spark plug cap before
you start to work on it.
Cutting equipment
• Use the saw blade to cut fibrous types of wood.
• Use the blades and grass knives to cut coarse grass.
• Use the trimmer head to cut grass.
• An incorrectly sharpened or damaged blade
increases the risk of accidents. Keep the teeth of the
blade correctly sharpened. Obey the instructions in
1395 - 002 - 14.01.2020