What are the effects of insufficient hydraulic fluid in a Tokyo Kikai hydraulic pump?

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First, what causes a shortage of hydraulic pump fluid? Let’s follow the experts from Tokyo Kikoki Oil Pumps to analyze the reasons for insufficient hydraulic oil in the pump. A WZ25-20 type excavator-loader experienced slow digging or loading speeds, and sometimes its operations would stop altogether, yet the pressure gauge showed normal readings. Based on visual inspection, there is no oil leakage at the connections of the oil pipes and working components ； The oil-sucking hydraulic hose also showed no deformation. Analysis confirms that the cause of the failure was insufficient fuel supply. The reasons include insufficient fuel in the tank, severe wear of the gear pump, failed spring in the relief valve or blocked damping holes, internal leakage, the directional control valve not being in the correct position, and blockages in other valves or pipelines. During maintenance, each of the possible failure points mentioned above was checked one by one. So what are the effects of insufficient hydraulic pump fluid? When the oil level in the tank is low, the hydraulic pump is prone to cavitation, resulting in a reduced amount of oil entering the system, which causes the digging or loading actions to slow down or to occur intermittently. The fuel tank level gauge was checked, and no low fuel level was detected. Severe wear of the gear pump can lead to increased internal leakage, resulting in insufficient flow output from the hydraulic pump and a drop in operating pressure. Since the pressure gauge shows that the operating pressure is normal, there should be no problem with the gear pump. In the event of a failure in the flow control valve, if the spring inside the valve fails, the oil discharged by the hydraulic pump will flow directly back to the tank through the flow control valve ； If the damping holes on the spool become blocked, the spool cannot automatically adjust the size of the orifice in the flow control valve, and the relief valve fails to perform its function of stabilizing pressure and allowing excess fluid to flow out. When the spool is in a position where the orifice is wide open, most of the oil can flow back to the tank through the flow control valve. This will result in an insufficient amount of oil in the system. After taking it apart to check, the like function was not disabled ； The damping holes on the valve core are also not blocked. Therefore, during the use of construction machinery, it is essential to regularly inspect the vulnerable components, especially those that are easily overlooked.