Daily maintenance of excavator generator: Seven essential checks!

March 22,2024

Nowadays, the development of electronicization and automation in excavators is relatively fast, which has greatly improved the performance of excavators in terms of work efficiency, energy conservation and environmental protection, lightweight operation, safety and comfort, reliability and durability. However, the electronicization and automation of excavators cannot be separated from an important basic object, which is the generator.


Today we are going to talk about the daily maintenance of the generator.

As the foundation of excavator electronicization and automation, the importance of the generator is self-evident. If the generator encounters problems, it will lead to a series of problems such as insufficient battery power, insufficient brightness of work lights, and insufficient display of power on the dashboard. In severe cases, it can cause damage to the dashboard and computer board. Since generators are so important, what issues should they pay attention to in their daily maintenance?

Let's briefly explain it below.


Check if the sliding ring (also known as contact ring) of the generator is dirty. 

Due to the rotation of the rotor, the excitation current is transmitted to the rotor winding (excitation winding) through the contact between the carbon brush and the slip ring. So, once the slip ring is dirty, the excitation current will not be transmitted to the excitation winding of the rotor, resulting in the generator not generating electricity.

Check if the rotor and stator of the generator collide.

 If the rotor collides or rubs with the stator, it will cause the rotor and stator to heat up, resulting in unstable current and voltage of the generator. In severe cases, it can damage the generator or electronic components on the excavator. If the rotor collides or rubs with the stator, it is generally due to wear or deformation of the generator bearings, generator end caps, or generator casing.

Check if the generator bearings are lacking oil or if the lubricating oil is dirty.

 If the bearings of the generator lack oil or have poor lubrication, it will cause excessive rolling resistance of the bearings, and the outer and inner rings of the bearings will rotate synchronously, resulting in excessive wear between the bearings and the bearing seats. Excessive wear of bearings can cause friction between the rotor and stator of a generator, resulting in overheating and unstable voltage and current of the generator.

Check the length of the carbon brush. If the length of the carbon brush is less than 5 millimeters, it should be replaced in a timely manner. 

The carbon brush on the generator plays a very important role. The current is generated through the carbon brush, slip ring, and excitation coil to generate a magnetic field, while the generator generates electricity by cutting the magnetic field through the coil. If there is a problem with the carbon brush, the generator will not generate a magnetic field. Without a magnetic field, power generation cannot be discussed.

Check the scale and dust on the exterior of the generator and remove them in a timely manner.

The generator generates a large amount of heat during operation, which can cause the temperature of the generator to be too high. Excessive temperature may burn out the generator, so fans are usually installed on the generator for forced cooling. If there is too much scale or dust on the generator, it will affect the heat dissipation effect, which will increase the probability of the generator burning out. Therefore, it is necessary to timely remove the scale and dust on the generator casing.

Check the fastening condition of all fasteners related to the generator.

If the fasteners are loose or detached, it is possible to cause severe engine vibration, which can lead to accidents on the machine. In addition, if fasteners are loose or detached, it may cause voltage and current instability, and even damage electronic components such as instruments. So, it is also important to check the condition of the fasteners related to the generator in a timely manner.

Check the tightness of the transmission belt.

If the conveyor belt of the generator is too loose, it can cause the belt to slip, and it can also cause the generator to not rotate or the speed to be too low. This will lead to unstable voltage and current of the generator or failure to generate electricity. If the conveyor belt is too tight, it will cause increased wear on the bearings of the charging generator, fan, and water pump, and in severe cases, it will lead to the generator being scrapped.

The generator on excavators is very important, especially in today's highly developed and rapidly developing era of electronics and automation, the importance of the generator as the foundation has become increasingly important. Therefore, the daily maintenance and upkeep of the generator becomes even more important. In the daily maintenance and upkeep of excavators, we must not forget to check the generator to avoid unnecessary losses.

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