Rotor - Husqvarna K4000 Workshop Manual

to examine the cables by measuring them in series with
the stator. Use the resistance setting, not the buzzer.
1. Measure between the switch and the carbon
brushes as in the illustrations.

6.6 Rotor

6.6.1 To examine the rotor
To examine the rotor, control the inductance. Twist the
cables to decrease the inductance from the multimeter
and get more accurate results.
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1. Remove the inspection cover to the carbon brushes.
To remove the carbon brushes on page 16
See
2. Connect the multimeter probes to the carbon
brushes. The stator will not change the result since
its circuit is broken at the circuit board.
3. Turn the rotor shaft by turning the blade slowly.
Make sure you get values for each winding of the
rotor.
230V: Typical measured value for a correct rotor is
around 13–14 mH
120V: Typical measured value for a correct rotor is
around 2.6–3.0 mH.
But the inductance values may be different between
different measurement instruments and machines.
Monitor the differences in the values during the test
more than how close they are to typical values. Different
values between the windings is a sign of a defective
rotor.
Repair and servicing - 21