STARTER MOTOR ASSEMBLY INSPECTION (DISASSEMBLY AND ASSEMBLY)


MAGNETIC SWITCH



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.

  • If there is no continuity, replace the magnetic switch.

COMMUTATOR

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

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

3.Check depth of the undercuts between the segments.
Standard value: 0.5 mm
Limit: 0.2 mm

FIELD COIL OPEN-CIRCUIT TEST



Check for continuity between the field brushes. There must be continuity.

FIELD COIL GOROUND TEST



Check for continuity between the field brush and yoke. There must be no continuity.

BRUSH HOLDER

1.Check continuity between the brush holder plate and the brush holder. The brush holder is okay if there is no continuity.

OVERRUNNING CLUTCH

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.

BRUSH

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.

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.

ARMATURE COIL SHORT CIRCUIT TEST
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.

3.Check insulation between the commutator segments and the armature coil core. There should be no continuity.

OPEN CIRCUIT CHECK OF ARMATURE

Check continuity between segments. There should be continuity.