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Main causes: oil pump wear and internal leakage, failed or stuck relief valve spring, internal leakage of hydraulic cylinder seals, leaking pipeline fittings, and oil viscosity too low. Check the pump, valves, cylinder seals and oil condition in sequence.

Usually caused by tramp iron or oversized feed, uncrushable material entering the crushing chamber, or overload protection pressure set too low. Adjust the rated protection pressure and check the iron removal device and feed size.

Check oil level and quality, filter blockage, bent or leaking oil pipes, correct rotation direction of the lubrication pump motor, and whether distributor indicator pins actuate. Clean filters regularly and change lubricating oil per schedule.