Hydraulic solenoid troubleshooting

The Hydraulic solenoid, also known as the solenoid directional valve, will be damaged during normal operation, and the damage will reach a certain level, which will cause the solenoid to fail and not work. This article will explain in detail the failure of the Hydraulic solenoid.

1.Hydraulic solenoid failure - the push rod becomes short in the wear of the solenoid tube

When the armature moves, the push rod in the solenoid is used to push the spool movement. Push-rod and spool are not integrated; Therefore, in continuous contact, it is bound to cause wear. After a long period of high-load impact, it may wear out and become significantly shorter. At this point, the spool has not been installed in place, which will affect the operation of the directional solenoid. Just put the putter back in and solve the problem. Here, it is important to note that the size of the new putter you purchase should be the same as the original size.


2.Hydraulic solenoid failure -- solenoid coil damage (normal combustion)

The combustion of electromagnets is also one of the common faults of Hydraulic solenoids. The reason for this situation is generally the quality of the Hydraulic solenoid itself, such as the poor processing of the valve core of the Hydraulic solenoid, and the diameter of the wire being too small, it is not easy to overheat. The failure caused by its quality problems can usually be noticed within a few hours after the Hydraulic solenoid is energized. After working for a while, the solenoid coil failure is mostly caused by environmental reasons.

3.Hydraulic solenoid failure -- spool outer diameter wear

Same wear as the holes in the valve chamber. Especially in the case of excessive impurities in the oil, excessive pollutants will exacerbate the wear of the solenoid slide valve. Although we cannot completely avoid such wear, we can extend the service life of the Hydraulic solenoid and maintain good working conditions. This requires us to regularly check the cleanliness of hydraulic oil, and to deal with excessive pollution of hydraulic oil.


4.Hydraulic solenoid failure - fatigue or fracture of the reset spring

This type of failure has a specific relationship with the material choice of the spring. Select an imported high wire spring, the surface is black, with good elasticity and fatigue resistance. Strengthening the surface treatment process can effectively prevent spring corrosion, and long service life. If such a failure occurs, both springs must be replaced at the same time, and the length must match the design of the Hydraulic solenoid.

5.Hydraulic solenoidfailure - valve chamber hole wear

There is often reciprocating movement between the spool and the valve chamber of the Hydraulic solenoid. Although the valve spool of the Hydraulic solenoid is designed with an oil groove, it can be filled with oil on the contact surface to minimize friction, but according to the working characteristics of the Hydraulic solenoid, the wear of the hole in the solenoid cannot be completely avoided. The valve chamber of the solenoid is made of ductile iron, which enhances the hardness of the valve chamber and delays the wear and deformation of the valve chamber hole to a certain extent. The wear of holes in the valve chamber can be repaired or replaced as needed. When returning, it must be noted whether the new valve box can be matched to the original solenoid assembly. For example, the solenoid tube and sealing ring of the Hydraulic solenoid, the spool, and other components. However, we do not recommend that you replace the directly mounted valve body, as the Hydraulic solenoid needs to be tested after assembly to ensure excellent valve operation.


6.Hydraulic solenoid failure - other rare failures

The above five are common failures of Hydraulic solenoids, of course, in addition to these five failures, there will be other abnormal problems. For example, the voltage and current of the solenoid are unstable, which will cause large impact fluctuations and burnout. And according to the working principle of the electromagnet, when the valve core of the Hydraulic solenoid is stuck, and the armature cannot move to its working position after the electromagnet is energized, the coil temperature of the Hydraulic solenoid will rise sharply, and it is easy to cause combustion in a short time. Most solenoid coils are faulty. Therefore, in actual maintenance, if the coil is burned out, please first check whether the Hydraulic solenoid works smoothly. After removing the spool and other faults, replace the new Hydraulic solenoid coil. Otherwise, the coil may still burn after replacement.



It should be noted here that when you are troubleshooting the Hydraulic solenoid, the value of the coil may be different from the manufacturer, and the inner diameter and length of the replaced coil must be the same as the original product, otherwise, the Hydraulic solenoid cannot continue to be used. If you want to replace the Hydraulic solenoid, you can contact us, we can provide you with an assembled Hydraulic solenoid, and the product you get is qualified product test, and quality assurance.

Relating reading:How to test the solenoid? 

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