Causes of Pressure, Heat, Noise and Vibration in Hydraulic Systems

Causes of Pressure Generation

1. Pressure reducing, relief or unloading valve miss adjusted
2. Yoke actuating device inoperative(in the case of variable displacement pumps)
3. Pressure reducing, relief or unloading valve damaged
4. Clogged Pressure filters
5. Wrong sizing and fabrication of pipework
6. Wrong design of the system
7. Overload the system actuator side above the designed capacity

Causes of Heat Generation

Overheating is one of the most occurring problems in hydraulic actuator systems, people who frequently operate with hydraulic systems will know how much overheating can affect the performance, safety and overall the costs. 

1. Hydraulic fluid is heated
2. Cavitation
3. Air in fluid
4. Relief or Unloading valve set too high
5. Excessive load
6. Worn or damaged pumps
7. Worn or damaged motors
8. Worn or damaged valve
9. System pressure too high
10. Unloading valve set too high
11. Fluid dirty or low supply
12. Incorrect fluid viscosity
13. Faulty fluid cooling system.
14. Wrong design and fabrication of hoses and pipes

Noise and Vibration in Hydraulic Systems

The health and safety issues relating to noise have been recognized for many years and legislation is now placing clear demands on manufacturers to reduce noise levels. Hence, noise reduction in hydraulic systems demands a lot of attention from the industrial as well as academic researchers. It needs a good understanding of how the noise is generated and propagated in a hydraulic system in order to reduce it. The main source of noise in hydraulic systems is the pump which supplies the flow. Most of the pumps used are positive displacement pumps. Of the positive displacement pumps, axial piston swash plate type is mostly preferred due to their reliability and efficiency.

Some of the main causes for Noise and Vibration are as follows: 

1. Cavitation in pump
2. Air in fluid
3. Coupling misaligned
4. Pump wore or damaged
5. Relief valve setting too low or too close to another valve setting
6. Worn poppet and seat
7. Clogged inlet line
8. Dirty Clogged reservoir and breather vent
9. Damaged charge pump (in the case of closed loop pump)
10. Clogged suction filters
11. Lack of anti-vibration pads for the electrical motor.
12. High viscosity oil
13. Lack of proper claim ping's for pipe work
14. Damaged pump bearings
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16. https://www.whyps.com/Blog/hydraulic/causes-of-pressure-heat-noise-and-vibration-in-hydraulic-systems