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1.Coil open circuit test.
- Check that there is continuity between the M terminal
and body A.
- If there is no continuity, replace the magnetic switch.
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2.Contact fusion check.
- Check that there is continuity between the B terminal
and M terminal.
- If there is continuity, replace the magnetic switch.
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3.Switch contact check.
- Push the indicated end of the magnetic switch with a
strong force to close the internal contacts. Without releasing the switch end, check that there
is continuity between the B terminal and M terminal.
- If there is no continuity, replace the magnetic switch.
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1.Place the armature on a pair of V-blocks and check the runout using a dial gauge. Standard value: 0.05 mm Limit: 0.1 mm
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2.Check the O.D. of the commutator. Standard value: 32.0 mm Limit: 31.0 mm
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3.Check depth of the undercuts between the segments. Standard value: 0.5 mm Limit: 0.2 mm
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Check for continuity between the field brushes. There must be continuity.
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Check for continuity between the field coil brush and yoke. There must be no continuity.
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Check continuity between the brush holder plate and the brush holder. The brush holder
is okay if there is no continuity.
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1.Check that the pinion locks when it is turned counterclockwise and moves smoothly when
it is turned clockwise. 2.Check the pinion for wear or damage.
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1.Check the brush for roughness of the surface that contacts the commutator and check the
brush length. Limit: Wear limit line 2.In case the contacting surface has been corrected or the brush has been replaced,
correct the contacting surface by winding sandpaper around the commutator.
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1.Set the armature on a growler. 2.While applying a thin piece of iron in parallel with the armature, turn the armature
slowly. The armature is okay if the piece of iron is not attracted or does not vibrate.
caution |
Clean the armature surface thoroughly before checking.
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3.Check insulation between the commutator segments and the armature coil core. There should
be no continuity.
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Check continuity between segments. There should be continuity.
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