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CAUTION: Replace the first gear wheel if
the rotor is replaced as a result of a
damaged rotor shaft.
3. Examine the rotor surface (C) for damage. If the
rotor is not in the center of the motor housing, the
rotor surface can be damaged. Replace the rotor if
the rotor surface is damaged
4. Examine the commutator (D) for damage. The
commutator surface must be repaired if the wear is
more than 0.07 mm. The nominal dimension is 31.8
mm.
5. Examine the coils (E) for damage. A short circuit
between the segments on the commutator can
cause burned coils. Unbalance or strong vibrations
can cause a wire break in the coil. The rotor must be
replaced if the coils or the wires are damaged.
6. Examine the insulation (F) for damage. Heat
overload can cause a damaged insulation. Overload
of the product, defective electronics or blocked air
slots can cause heat overload. The rotor must be
replaced if the insulation is damaged.
7.2.2 To do an electrical check of the rotor
•
Do a check of the rotor windings with a multimeter.
Examine 2 adjacent commutator plates. Refer to
Servicing tools on page 6 .
230V: Typical measured value for a correct rotor is
R = 0.14 Ω ± 5%.
120V: Typical measured value for a correct rotor is
R = 0.03 Ω ± 5%.
32 - Function test
7.3 Stator
7.3.1 To do a check of the stator
•
Remove the air disc.
•
Clean the motor housing.
•
Examine the windings for damage.
•
Examine the screws for damage. Tighten if it is
necessary.
7.3.2 To do an electrical check of the stator
•
Do a high voltage check with the high voltage tester.
a) Set the high voltage tester to 1000V. Refer to
Servicing tools on page 6 .
b) The 2 coils must be examined. Put the test
probes as the illustration shows.
1000V
No fault signal must show on the high voltage tester.
1000V
1332 - 001 - 04.03.2021
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