The reasons why the pressure of the hydraulic press cannot be raised may include the following: 12
Hydraulic pump problem: The hydraulic pump is the core component of the hydraulic system, and its working state directly affects the pressure output of the hydraulic press. If the hydraulic pump is severely worn, the internal leakage is large, or the hydraulic pump is wrong, there is no pressure oil to be exported, and the system pressure cannot rise. In addition, problems such as too low motor speed, insufficient power, or internal damage, large leakage, and low volume efficiency caused by long-term use of the hydraulic pump can also lead to insufficient pump outlet flow and insufficient system pressure.
Overflow valve failure: The overflow valve acts as a safety valve in the hydraulic system. If the overflow valve fails and is in a normally open state, the system pressure cannot be established. In addition, if there are contaminants on the main valve core or the cone valve body of the pilot part of the overflow valve, or it is stuck in the opening due to rust, or it loses its function due to spring breakage, or the damping hole is blocked, the hydraulic oil output by the pump will flow directly to the oil tank through the overflow valve, resulting in insufficient working pressure or no working pressure.
Large internal leakage of the directional valve: Large internal leakage of the directional valve can also cause the system pressure to fail to be established.
Large leakage in the actuator: Large leakage in the actuator will also show low pump pressure, which will cause the hydraulic press pressure to fail to rise.
Hydraulic oil temperature is too high: System pressure is too high, oil circuit is blocked, hydraulic oil pool lacks oil, hydraulic oil is unqualified, etc. may cause the hydraulic oil temperature to be too high, which in turn affects the normal operation of the hydraulic press.
Hydraulic cylinder problem: The sealing and volume state of the hydraulic cylinder are also important factors affecting the pressure of the hydraulic press. Poor sealing or volume damage may cause the hydraulic press to have no pressure.
Contamination, overheating and air entry: Common causes of failure in hydraulic systems include contamination, overheating and air entry. These three unfavorable factors are closely related. If any of them occurs, one or more other problems will occur, causing the hydraulic system to fail to work properly.
Solutions to these problems include but are not limited to replacing or repairing the hydraulic pump, disassembling and cleaning the overflow valve, repairing and replacing the overflow main valve core and valve body, disassembling and cleaning the overflow valve and replacing or repairing the pilot needle valve and valve seat, checking and adjusting the pump output flow, cleaning the hydraulic oil circuit, etc.
