Cause Analysis:
1. Poor insulation of the electromagnetic coil;
2. The power supply voltage is higher than the specified voltage, causing the heating phenomenon of the coil;
3. The electromagnet core is not concentric with the spool axis;
4. Frequent commutation causes the coil to overheat;
5. The dry electromagnet enters the oil and burns the coil;
6. The pusher is too long and the stroke of the electromagnet is improperly matched.
Approach:
1. Replace the electromagnet;
2. Check the power supply voltage and adjust to the specified range;
3. Check and re-weld;
4. Switch to wet DC electromagnet;
5. Trim the putter;
6. Disassembly and reassembly;
7. Check and eliminate oil leakage at the push rod or replace the sealing ring.
Knowledge supplement:
What is the reason for the oil leakage of the joint surface of the directional valve of the Kobelco SK330-8 excavator plate connection?
Analysis:
1. Poor machining accuracy of the mounting base;
2. The screw of the installation screw is too loose;
3. The screw material does not meet the requirements and is stretched and deformed;
4. The bottom sealing ring is aged or does not play a sealing role.
