1, oil temperature overheating
1 Hydraulic system hydraulic oil temperature rise should generally not exceed 40 °C. That is to say, when the crane is working at an ambient temperature of 40 ° C, the maximum oil temperature should not exceed 80 ° C. Excessive oil temperature will cause the viscosity of the hydraulic oil to drop, the clearance of parts to be increased, and the rubber seal to be damaged, so that the hydraulic system The leak is serious and the drive is weak.
2 The cause of overheating is multifaceted. In addition to design and manufacturing factors, it is mainly caused by poor component adjustment, operation and maintenance.
Eg: a, the relief valve is too high pressure, a large amount of inefficient energy is converted into heat;
b. The hydraulic drive of the crane is driven by high pressure and large flow. The frequent commutation during operation will cause the oil temperature to rise suddenly; c. The hydraulic oil tank has less oil or too much fouling of the radiator, which affects the heat dissipation effect of the hydraulic oil.
2. The noise is too large
1 Hydraulic system in the design and manufacturing process, through the reasonable selection of components and careful assembly, to eliminate the root cause of noise as much as possible.
2 The main cause of noise during the operation of the hydraulic system is the high frequency vibration caused by the gas mixed in the system.
3 Sources of gas in the hydraulic system:
a, the air pump caused by the oil pump into the oil path is not smooth.
The cause is: the oil filter is blocked or too small, the suction pipe diameter is too small, the suction pipe elbow is too much, the suction pipe is too long, the oil temperature is too low, the oil is not suitable, the vent hole is too thin or The blockage, suction line damping is too large, the charge pump is faulty, the hydraulic pump speed is too high, and the hydraulic pump is too high.
b. Air is mixed in the hydraulic oil.
The reasons for this are: the fuel tank liquid level is too low, the fuel tank design is unreasonable, the oil return pipe is above the liquid level, the oil is not suitable, the pump shaft oil seal is damaged, the suction pipe joint is leaking, the hose has air holes, and the system is exhausted. bad.
3. The leak is too large
Leakage in the hydraulic system is often manifested by a drop in working pressure, which may result in reduced speed or creep of the actuator when the leak is severe.
1 The leakage of the hydraulic system has the points of leakage and internal leakage. The external leakage can be visually discovered by the person. The internal leakage needs to be confirmed by the instrument test pressure or flow.
2 Except for a few external leaks, which are caused by sealing problems due to damage to the component housing or piping.
3 should understand the working principle and use of various forms of sealing:
a. When replacing the seal, pay attention to whether the material properties, model size, etc. meet the requirements;
b. The installation position of the retaining ring should help the seal to function and increase the service life;
c. Before installing the seals, carefully clean them to prevent dirt from entering;
d. Care should be taken when installing the seal to prevent scratches, bites and twists;
e. Use a screw-tight seal to ensure that the pressing force is appropriate and uniform.
4 The leakage situation is more complicated. If the design factor of the component is not taken into account, the most important reason is that the clearance is too large, the sealing performance of the oil seal is poor or damaged, and the hydraulic oil is used too thin. When there is an internal leakage in the hydraulic system, the general maintenance method is to replace the components or related parts. The hydraulic components of the replaced parts should be tested after the bench test.
4. The shock is too large
1 Excessive vibration of the hydraulic system is often caused by the components are not firmly fixed, the oil pump is not installed properly, and the air is mixed in the system. The high-frequency vibration is accompanied by noise.
2 The imbalance of the oil pump installation is mostly caused by the imbalance of the flexible coupling and the poor alignment of the pump shaft.
3 Measures to eliminate excessive vibration are mainly to ensure that the hydraulic components are installed correctly and firmly to prevent system air intake.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
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