Hydraulic systems are the backbone of many construction machinery and industrial equipment. However, noise problems in hydraulic systems can not only be a nuisance but also indicate underlying issues that may affect the performance and lifespan of the equipment. In this blog post, we'll take a closer look at some common noise faults in hydraulic components and how SINOCMP can be your go-to solution provider.

1. Noise in Piston Pumps or Motors

Piston pumps and motors are common sources of noise in hydraulic systems. Key causes include:

Air Suction

Air suction occurs when air enters the fluid, forming bubbles that collapse in high-pressure zones, creating noise. Common causes are:

• Clogged filters or inlet pipes.

• High fluid viscosity.

• Damaged seals or loose connections in the inlet pipe.

• Low fluid levels in the reservoir.

Solution: Inspect and clean filters, check seals, and ensure proper fluid levels.

Worn Internal Hydraulic Parts

Over time, components like the cylinder block, valve plate, and pistons can wear out, causing internal leakage and flow pulsation. This leads to noise, especially at high pressure and low flow rates.

 Solution:

• Increase the bias angle of the variable mechanism to compensate for leakage.

• Repair or replace worn components.

Issues with the Valve Plate

The valve plate is a critical component that can cause noise if:

• Its surface is worn or clogged with debris, shortening the unloading groove and causing oil trapping.

• It is installed incorrectly during assembly.

Solution: Repair or replace the valve plate and ensure proper installation.

At SINOCMP, we stock premium piston pump and motor components, including valve plates, seals, and repair kits, to help you eliminate noise and restore performance. Browse our piston pump and motors here.

2. Noise in Relief Valves

Relief valves are critical for controlling pressure in hydraulic systems, but they are prone to high-frequency noise. This is often caused by instability in the pilot valve, leading to pressure oscillations and air vibration. Common causes include:

• Air in the Hydraulic Fluid: Air trapped in the fluid can cause cavitation in the pilot valve’s front chamber, resulting in high-frequency noise. 
  Solution: Bleed the air from the system and ensure proper sealing to prevent air from re-entering.

• Worn Needle Valve: Frequent use can wear out the needle valve, preventing it from sealing properly with the valve seat. This leads to unstable flow and pressure fluctuations. 
  Solution: Repair or replace the needle valve.

• Fatigued Spring: A worn or deformed spring in the pilot valve can cause unstable pressure regulation. 
  Solution: Replace the spring with a high-quality replacement part.

At SINOCMP, we offer durable relief valve components designed to minimize noise and ensure reliable performance. Explore our range of relief valve parts here.

3. Noise in Hydraulic Cylinders

Hydraulic cylinders are essential for converting fluid power into linear motion, but they can produce noise due to:

• Air in the Fluid or Cylinder: Air trapped in the system can cause cavitation under high pressure, leading to significant noise. 
  Solution: Bleed the air from the system.

• Tight Seals or Bent Piston Rods: Overly tight seals or bent piston rods can create resistance during movement, causing noise. 
  Solution: Replace the seals or straighten the piston rod.

SINOCMP provides high-performance seal kits that ensure smooth operation and reduce noise. Check out our seal kits here.

4. Noise in Hydraulic Pipes

Improperly arranged pipes or loose fasteners can cause vibrations and noise. 

Solution:

• Avoid sharp bends in the piping layout.

• Tighten any loose clamps or fasteners.

Conclusion

Noise in hydraulic systems is often a sign of underlying issues that need immediate attention. By understanding the common causes and solutions, you can maintain your equipment’s efficiency and longevity. For reliable replacement parts and expert advice, trust SINOCMP to keep your machinery running smoothly.

Visit our website today to explore our full range of hydraulic components and place your order. Let SINOCMP be your partner in maintaining peak performance for your engineering machinery!