Carbon Brushes - Husqvarna K 3000-Electric Workshop Manual

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CARBON BRUSHES

Replacing the carbon brushes
The two carbon brushes transfer electric current to the motor's rotor.
The carbon brushes are wear parts that must be checked regularly; every
week if the machine is used daily.
You should replace the carbon brushes when around half is left. You can
easily measure this using a slide gauge without removing the brushes. Replace
the carbon brushes when the distance from the brush holder to the top level
of the brush exceeds 10 mm/.4 in.
Worn carbon brushes – checking
The importance of replacing the brushes in good time is demonstrated by the
adjoining illustrations.
The illustrations to the left show a brush that is worn but still operable.
Both the brush and the collector have minor scratches in the direction of
rotation which is entirely normal.
The illustrations to the right show the results when the brush is so worn
that the spring, which presses the brush down on the collector, has reached its
end position and no longer gives the brush the correct pressure to the collector.
Sparking occurs which damages both brushes and, even worse, the collector in
a very short time.
Pay careful attention to sparking near the collector
The information given above shows that it is important to avoid sparking
around the collector. If the brushes are not worn, sparking could be due to
the brushes being unable to move in their holders as a result of, for example,
dirt. Sparking normally occurs when running in new brushes.
Replacing the carbon
brushes
1. K3000 Wet: Remove the screw
and take off the cover.
2. K3000 Electric, Cut-n-Break:
Uncover the screw and remove
the cover.
3. K3000 all:
Uncover the screw as above.
Cut the decal and remove the
cover.
4. Loosen the screw one turn.
5. Pull out the cable lug.
6. Lift the spring and pull out
the carbon brush.
Clean the holder.
7. Fit new carbon brushes.
Replacing the carbon
brushes
1. K3000 Wet, right side: Remove the
screw by the hose holder. Remove the
cover.
2. K3000 Electric, Cut-n-Break, right side:
Cut the decal by the round mark to
uncover the screw. Remove the cover.
3. K3000 all, left side:
Uncover the screw as above.
Cut the decal with a knife by the mark in
the decal. Remove the cover.
4. Loosen the screw and screw it out one
turn. Let the screw remain in place.
5. Pull out the cable lug from the screw.
6. Lift the spring with an angle hook. Lift
off the carbon brush.
Clean the holder from carbon particles
and dirt.
7. Fit new carbon brushes. Check that the
carbon brush cable runs over the spring.