Checks and Inspections

Checks and Inspections

• Clean the rotor, ring gear with internal teeth, the gear with transmission and the relay using only compressed air (max 4 bar) and a clean cloth. Never use liquid detergents. The other parts, such as for example screws and the rotor shaft may be washed with non inflammable liquid detergents to be found normally in commerce.

CAUTION: Carefully dry any washed parts, otherwise they might form explosive gases inside the sealed starter motor.

Checking the outside of the collector

• Check for any worn points; if necessary, proceed as follows:

• Tighten the rotor on the collector side and drive side support taking care not to damage the rotor shaft.

CAUTION: When turning do not tighten the rotor shaft in the chuck.

• Turn the collector using suitable tools ensuring that its diameter is within the specified measurements.

• Also check that the eccentricity of the collector and of the pack of plates is within the specified values.

• If there are annealed points or interruptions on the collector, change the rotor.

Collector continuity test

• Place the tester prods on the collector blades and check that the tester indicates the passage of current. In the lack of continuity, change the rotor.
• Repeat the above-mentioned operations for all the corresponding pairs of blades.

Rotor insulation test

• Place one tester prod on the collector and the other on the blade pack or on the shaft and check that the tester does not indicate the passage of current. If insulation is lacking (short circuit), change the rotor.
• Repeat the above-mentioned tests for all the collector blades.

Checking brush wear

• To check the brushes, release the brush holder from its plate.
• Check that the length of the brushes is within the specified values and that they are not damaged; if necessary, change the whole brush holder plate.

• Also check that the brush springs are not strained and are stiff enough to warrant good contact of the brushes on the collector.

Brush holder insulation test

• Connect one prod of the tester to the brush holder support plate and the other on a positive brush holder and check that the tester does not indicate the passage of current.
• Repeat the test for the other positive brush holder.
• If insulation is lacking, change the brush holder plate.