If the starter is activated for an extended time, for example, in the case of excessively long venting processes after diesel filter changes, there is a risk of thermal overload of the unit. Such thermal stress will shorten the service life of the starter and, in extreme cases, will destroy it.
The maximum activation time depends on the cranking torque of the combustion engine:
Example for starter type HEF109-L 24V:
Example for starter type R78-M 12V:
Example of damage to the winding of the pole housing:
Insulating ring melts and enamelled wire discolours due to very high temperatures.
Example of damage to the armature winding:
Enamelled wire and armature lamella stack discolour due to the very high temperatures.
Example of damage patterns on the engagement solenoid winding:
Adhesive tape and enamelled wire discolour due to the very high temperatures, the winding support shows melting.