![](../../../img/16/AK602856AB00ENG.png)
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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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![](../../../img/16/AK602857AB00ENG.png)
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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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![](../../../img/16/AK602858AB00ENG.png)
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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.
- If there is no continuity, replace the magnetic
switch.
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![](../../../img/16/AK602859AB00ENG.png)
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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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![](../../../img/16/AK602860AB00ENG.png)
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2.Check the O.D. of the
commutator. Standard value: <4M41>
32.75 mm <6G75> 28.35
mm Limit: <4M41> 31.75
mm <6G75> 27.35 mm
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![](../../../img/16/AK602861AB00ENG.png)
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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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![](../../../img/16/AK602862AB00ENG.png)
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Check for continuity between the
field brushes. There must be continuity.
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![](../../../img/16/AK602863AB00ENG.png)
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Check for continuity between the
field brush and yoke. There must be
no continuity.
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![](../../../img/16/AK602864AB00ENG.png)
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1.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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![](../../../img/16/AK602865AB00ENG.png)
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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 were or damage.
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![](../../../img/16/AK602866AB00ENG.png)
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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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![](../../../img/16/AK602867AB00ENG.png)
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3.When removing a worm brush
by breaking with pilers, use care to prevent
damage to the pigtail. 4.Polish the pigtail end
for secure soldering. 5.Insert the pigtail into
the hole of a new brush and solder. Make sure that there is
no excess solder on the brush surface.
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1.Set the armature on a
growler.
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![](../../../img/16/AK602868AB00ENG.png)
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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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![](../../../img/16/AK602869AB00ENG.png)
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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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![](../../../img/16/AK602870AB00ENG.png)
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Check continuity between segments.
There should be continuity.
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