For John Deere 310J 843K 310K hydraulic solenoid valve KV25678 SV98-T39S 12V

The working principle of proportional electromagnetic control valve is introduced

        It is based on the principle of the solenoid on-off valve: when the power is off, the spring presses the core directly against the seat, causing the valve to close. When the coil is energized, the electromagnetic force generated overcomes the spring force and lifts the core, thus opening the valve. The proportional solenoid valve makes some changes to the structure of the solenoid valve: it creates a balance between the spring force and the electromagnetic force under any coil current. The size of the coil current or the size of the electromagnetic force will affect the plunger stroke and valve opening, and the valve opening (flow) and the coil current (control signal) is an ideal linear relationship. Direct acting proportional solenoid valve flows under the seat. The medium flows in from under the seat, and the direction of the force is the same as the electromagnetic force, and the opposite of the spring force. Therefore, it is necessary to set the large and small flow values corresponding to the working range (coil current) in the working state. The proportional solenoid valve of the Drey fluid is closed (NC, normally closed type) when the power is off.

    Solenoid valve fault alarm troubleshooting method

      When the Kobelco excavator appears D prefix and E prefix alarm code, such as D012, E013, it is a solenoid valve problem; When the alarm code beginning with the letter D is encountered, it is the relevant solenoid valve fault, and later friends can inquire about the fault, according to the specific location of the following instructions to find the relevant parts and solve the fault in time. (Take Kobelco SK-8 series models as an example) Find the location of the solenoid valve and switch with the interchangeable solenoid valve next to it. If the alarm disappears and other alarms are generated, it should be the fault of the solenoid valve.

    In addition to the fault of the solenoid valve itself, there may be a line problem, and there is a adapter between the line and the computer board, which requires service personnel to check the wiring harness.

Excavator proportional solenoid valve how to determine good or bad

1, determine whether the solenoid valve y2 close strictly remove the motor to the solenoid valve y2 two oil pipes, and use two plugs to block the motor end of the two oil ports, and then operate the main hoist, if it works normally, indicating that the fault from the solenoid valve y2 closed loosely; If it is still abnormal, it is necessary to check its parts.

2, determine whether there is a problem with the hydraulic lock first adjust its two lock cores, if it does not work, and then remove the lock for careful inspection, if you can not find the reason, you can use the ready-made lock to do the installation test to find out the cause of the failure. Because the hydraulic lock of the secondary winch is the same as that of the main winch, the lock of the secondary winch can also be borrowed to identify the quality of the main winch lock by replacing it one by one. If both locks are OK, proceed to the next step.