First, preliminarily detect whether the machine is stuck in the valve:

The pressure of the machine is low, the operation is very slow, the pressure gauge shows only 30-50 kg, the action is too slow (Note: the pressure of the machine can reach 120 kg under normal conditions)

This relief valve is used to control the total pressure. There is a valve core in the middle of the solenoid valve. Press it with an Allen wrench. If the pressure still does not come up, it is judged that the valve is stuck.

Online cleaning steps after the relief valve is stuck:

The four 5mm screws need to be removed, and the sealing ring must be preserved, and the four 8mm screws below it should also be removed. The middle one is the valve core. After slowly taking it out, check whether there are iron filings or garbage on it. Then take a cardboard box to block this place. On the front control panel, control the motor to start, and hydraulic oil will be sprayed out for about 15 seconds. Remember, block it with a cardboard box, otherwise oil will splash outside. It is enough to spray for about 15 seconds, and then put the valve core in, don't install it in the wrong direction, the valve core should be able to move freely and easily, and that's it. Then install the four 8mm screws, and then install the four 5mm screws in, check the sealing ring again, and don't lose it.

Now run the machine and test it to see if the pressure comes up. If the pressure of the machine has been raised and recovered (normally it can reach 110~120 kg), it means that the cleaning of the relief valve is completed.