|
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.
|
|
2.Contact fusion
check.
- Check that there is continuity between the B
terminal and M terminal.
- If there is continuity, replace the magnetic
switch.
|
|
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.
|
|
1.Place the armature on a
pair of V-blocks and check the run-out using a dial
gauge.
Standard value: 0.05 mm
Limit: 0.1
mm
|
|
2.Check the O.D. of the
commutator.
Standard value: 29.4 mm
Limit:
28.4 mm
|
|
3.Check depth of the
undercuts between the segments.
Standard value:
0.5 mm
Limit: 0.2 mm
|
|
Check for continuity between the
field brushes. There must be continuity.
|
|
Check for continuity between the
field coil brush and yoke. There must be no
continuity.
|
|
Push the brush into the brush
holder to make sure that the spring is working on the
brush.
If the spring is not working, replace the brush
holder.
|
|
1.Check that the pinion
locks when it is turned anti-clockwise and moves smoothly
when it is turned clockwise.
2.Check the pinion
for wear or damage.
|
|
1.Check the commutator
contacting surface of each brush for abnormal roughness.
Also check the height of the brush. Replace the brush holder
if the height is lower than the limit.
Limit:
7.0 mm
2.When the contact surface of the
brush is rectified or the brush holder is replaced,
recondition the contact surface with sandpaper wrapped
around the commutator.
|
|
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.
|
|
3.
| caution |
Clean the armature surface
thoroughly before checking.
|
Check insulation between the commutator segments and
the armature coil core. There should be no
continuity.
|
|
Check continuity between segments.
There should be continuity.
|