How to Check a Solenoid Valve Coil?

Solenoid valve coils are critical components in construction machinery, responsible for controlling the operation of the hydraulic system. However, they can sometimes be problematic, so regularly checking solenoid valve coils is a critical step in ensuring the proper operation of your machinery and equipment. The following will detail how to check solenoid valve coils to ensure the smooth operation of construction machinery.

1. Visual inspection

First, perform a visual inspection to ensure that the solenoid valve coil is not visibly damaged or worn. Check that the coil's housing is intact and free of any cracks or corrosion. Ensure that the coil's connecting wires are not broken or frayed to avoid electrical connection problems that could affect other diesel engine parts.

2. Resistance Measurement

Similar to the diesel solenoid valve, a multimeter can be used to measure the resistance of the solenoid valve coil. This can help determine if the coil is within the normal range. Typically, the resistance value of the coil will be within the specified range, depending on the specifications of the coil. Suppose the resistance value is significantly out of specification. In that case, it may be necessary to consider further repairs or replacement to avoid interfering with other equipment in the unit such as the starter motor and alternator.

3. Short Circuit Check

Check the coil for short circuit problems. Set the multimeter to low impedance measurement mode and connect the two measurement probes to the terminals of the coil. If the reading is zero or very low, this may indicate a short circuit problem that needs to be repaired or replaced.

4. Connection and Power Test

Ensure that the coil's cables are securely connected and not loose or corroded. Also, check that the supply voltage is correct to ensure that the coil is receiving the correct power supply. The solenoid coil needs the correct voltage to work properly, otherwise, it may cause malfunction.

5. Temperature Test

In some applications, solenoid valve coils are required to operate in high-temperature environments. Check that the coil can withstand the required operating temperature range. If the coil fails at high temperatures, it may be necessary to upgrade to a more temperature-resistant coil.

6. Motion Test

Finally, perform an action test of the coil. By applying the proper amount of current, observe if the coil can open and close the valve or perform its designed function properly. If the coil makes unusual noises or does not function properly during operation, it may need to be repaired or replaced.

In construction equipment maintenance, inspecting solenoid valve coils is critical in ensuring the reliability and performance of your machinery and equipment. Through visual inspections, resistance measurements, short-circuit checks, connection and power tests, temperature tests, and action tests, you can detect problems early and take appropriate repair measures to ensure the smooth operation of construction machinery.