Repair And Servicing; Carbon Brushes - Husqvarna K4000 Workshop Manual

6.1 Carbon brushes

The carbon brushes transmit electric current to the rotor.
The carbon brushes are wear parts and must be
examined regularly.
6.1.1 To examine the carbon brushes
The illustration shows a brush that is worn but can be
used. The brush and the collector only have small
scratches in the direction of turning. The illustration also
shows the results when the brush is worn. The spring no
longer gives the brush the correct pressure. Sparks
occurs which causes damage to the brushes and the
collector in a very short time. Sparks can also occur if
the brushes cannot move. This can be because of dirt.
Running in new brushes can also cause sparks.
1. Examine the brush using a Vernier caliper.
Replace the brushes when there is more than
10mm/.4in between the brush holder and the top of the
brush.
>10 mm (.4")

16 - Repair and servicing

6 Repair and servicing
6.1.2 To remove the carbon brushes
1. Remove the screws and the inspection cover.
2. Loosen the screw one turn and remove the cable
3. Lift the spring and remove the carbon brush.
lug.
474 - 002 - 27.06.2018