Question 1

What should I do if the motor does not rotate?

Accepted Answer

Check the accuracy of the connection lines.

Question 2

Why does the oil cylinder not rise or rises unsteadily when the motor starts?

Accepted Answer

Possible causes include: low oil level (add oil to specified level), incorrect oil viscosity (use recommended oil), clogged filter screen (clean or replace), air leaks in suction pipe (repair seals), solenoid valve not closed (clean or replace), emergency button not reset, solenoid valve energized causing unloading (check circuit), motor rotating in reverse (reconnect), relief valve misadjusted (reset pressure), or improper coupling (reinstall or replace).

Question 3

What causes the relief cylinder to not descend or descend unsteadily during unloading?

Accepted Answer

Check if the solenoid valve is powered, if input voltage meets requirements, if filter screens are clogged (clean or replace valve core), if the electromagnet is damaged due to overheating, if throttle or pressure compensation valves are blocked, or if electrical signals are incorrect.

Question 4

Why does the system fail to maintain pressure and the cylinder drops down?

Accepted Answer

This may be due to an unsealed check valve (clean or replace seal), an unsealed solenoid or manual valve (clean or replace seal), or a problem with the actuator itself (connect a pressure gauge to the oil outlet to verify).

Question 5

How to fix oil leakage between the oil tank and valve block?

Accepted Answer

Inspect and replace the worn or broken O-ring.

Question 6

What to do if oil seepage occurs between the motor rear cover and valve block?

Accepted Answer

If leakage is at the high-pressure part of the valve block, remove the motor for inspection; if unsolvable, notify the manufacturer to replace the entire power unit. If the gear pump skeleton oil seal is loose, replace the gear pump.

Question 7

Why does the motor continue to run after the switch is cut off?

Accepted Answer

Check for electrical connection errors, a burned-out start switch (replace it), or a burned-out AC contactor (replace it).

Question 8

How to reduce excessive system noise?

Accepted Answer

Remove air from the system by working back and forth, check and reinstall or replace a worn coupling, inspect and replace a failed motor, or avoid operating under extreme pressure for long periods (stop when the relief valve overflows).

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