Starter Motor Components Check

Service Data And Specifications (SDS):

Service Data Specifications (SDS)

Pinion-Clutch Check





1. Inspect pinion teeth.
- Replace pinion if teeth are worn or damaged. (Also check condition of ring gear teeth.)
2. Check to see if pinion locks in one direction and rotates smoothly in the opposite direction.
- If it does not lock (or locks) in either direction or unusual resistance is evident ... Replace.
3. Inspect internal gear teeth.
- Replace internal gear if teeth are worn or damaged. (Also check condition of armature shaft gear teeth.)

Brush Check

BRUSH





Check brush for wear.

Wear limit length: Refer to S.D.S.

- Excessive wear ... Replace.

BRUSH SPRING PRESSURE





Check brush spring pressure with brush spring detached from brush.

Spring pressure (with new brush): Refer to S.O.S.

- Not within the specified values ... Replace.


Brush Check (Cont'd)

BRUSH HOLDER





1. Perform insulation test between brush holder (positive side) and its base (negative side).
- Continuity exists. ... Replace.

2. Check brush to see if it moves smoothly.
- If brush holder is bent, replace it; if sliding surface is dirty, clean.

Pole Piece Check





Pole piece is secured to yoke by bonding agent. Check pole
piece to see that it is secured to yoke and for any cracks. Replace malfunctioning parts as an assembly. Holder may move slightly as it is only inserted and not bonded.

Armature Check





1. Continuity test (between two segments side by side).
- No continuity ... Replace.





2. Insulation test (between each commutator bar and shaft).
- Continuity exists. ... Replace.





3. Check commutator surface.
- Rough ... Sand lightly with No.500 - 600 sandpaper.





4. Check diameter of commutator.

Commutator minimum diameter: Refer to S.D.S.

- Less than specified value ... Replace.





5. Check depth of insulating mold from commutator surface.
- Less than 0.2 mm (0.008 in) ... Undercut to 0.5 to 0.8 mm (0.020 to 0.031 ln)





Assembly
Apply high-temperature grease to lubricate the bearing, gears and frictional surface when assembling the starter. Carefully observe the following instructions.

PINION PROTRUSION LENGTH ADJUSTMENT
With pinion driven out by magnetic switch, push pinion back to remove slack and measure clearance between the front edge of the pinion and the pinion stopper.

Clearance: Refer to S.D.S.

- Not in the specified value ... Adjust with adjusting plate.

Service Data And Specifications (SDS):

Service Data Specifications (SDS)