The generator is non-repairable. The generator(s) feature the following major components:

The pulley and the fan cool the slip ring and the frame.

The generator features permanently lubricated bearings. The only serviceable components on the Bosch generators are the voltage regulator/brush kit and the generator rear cover. Otherwise, the generator is replaced as a complete unit.

The voltage regulator controls the field current of the rotor in order to limit system voltage. The regulator switches the current on and off at a rate of 400 cycles per second in order to perform the following functions:

At high speeds, the on-time may be 10 percent with the off-time at 90 percent. At low speeds, the on-time may be 90 percent and the off-time 10 percent.