Are leaking cylinders affecting your CNC prensa plegadora performance? Replacing the cylinder seal rings is crucial for restoring precision and preventing hydraulic fluid loss.

Replacing cylinder seal rings in CNC prensas plegadoras ensures proper hydraulic pressure, avoiding costly leaks and downtime. Learn the steps to replace them effectively and extend the life of your machine. In the next section, we’ll guide you through the step-by-step process of replacing cylinder seal rings.

Part 1 Guide Sleeve

Wiper Seal

A wiper seal is a crucial component in CNC press brakes, designed to prevent contaminants such as dust, dirt, and metal shavings from entering the hydraulic cylinder. Positioned at the cylinder’s outer end, it ensures smooth piston movement by wiping away debris, thereby extending the seal’s lifespan and maintaining hydraulic efficiency. Wiper seals are made from durable materials like polyurethane or nitrile rubber to withstand high-pressure environments. Regular inspection and timely replacement of worn wiper seals help prevent hydraulic leaks and performance issues. Proper maintenance ensures consistent bending accuracy, reduces downtime, and enhances the overall longevity of the press brake.

Properly Installing Wiper Seals and Flipping the Guide Sleeve

Ensure that the double-edge of the wiper seal is facing towards the oil side before installation. Carefully snap the wiper seal into the designated groove, making sure it fits securely and evenly. Repeat the process for the second wiper seal, ensuring proper alignment and placement. Once both wiper seals are correctly installed, flip the guide sleeve 180 degrees to complete the setup. This step ensures the proper positioning of the seals for optimal performance and prevents oil leakage. Double-check the installation to confirm that the seals are firmly seated and the guide sleeve is correctly oriented before proceeding.

O ring

O-rings are essential sealing components used in CNC press brake hydraulic cylinders to prevent fluid leakage and ensure efficient operation. Made from durable rubber or synthetic materials, they fit snugly between metal parts, maintaining pressure and minimizing wear. Over time, O-rings can degrade due to high pressure, temperature fluctuations, or contamination, leading to hydraulic inefficiencies. Regular inspection and timely replacement of worn O-rings are crucial for maintaining machine performance. Choosing high-quality O-rings with proper resistance to oil and heat extends the lifespan of hydraulic components, ensuring smooth press brake operation and reducing downtime in metal bending processes.

Install the O-ring in the outer section

To ensure a proper seal and prevent hydraulic leaks, carefully install the O-ring in the outer section of the cylinder. Before installation, clean the groove thoroughly to remove any dust, debris, or old sealant. Apply a thin layer of hydraulic oil or grease to the O-ring to reduce friction and ease the installation process. Gently stretch and position the O-ring into the groove, ensuring it sits evenly without twisting or deforming. Press it firmly into place, making sure it aligns perfectly with the sealing surface. A properly installed O-ring enhances the press brake’s efficiency, prevents leaks, and extends cylinder life.

Step seal

A Step Seal is a crucial component in CNC press brake hydraulic cylinders, designed to provide efficient sealing and low friction. It consists of a PTFE sealing element combined with an elastomeric O-ring, asegurando high durability and leak prevention under extreme pressure. The unique step profile helps maintain optimal lubrication, reducing wear and extending the cylinder’s service life. Step seals are commonly used in high-performance hydraulic and pneumatic systems, where precision and reliability are critical. Regular inspection and replacement of worn step seals help maintain consistent machine accuracy and prevent hydraulic fluid leakage, ensuring smooth operation and long-term efficiency.

The Step seal is a combination of an O-ring and a wear ring. The O-ring of the Step seal is fitted first and then the wear ring is fitted. The wear ring has a small step-like design on one side, making the small step toward the oil.

Guide Belt.

Before installing the guide belt, apply grease. The grease needs to be applied evenly and thinly. Continue greasing after installation. The grease will lubricate and prevent rusting.

Grease & Hydraulic Oil Application.

Carefully grease the inner ring and apply a layer of hydraulic oil as shown. The main function is both to lubricate and to prevent rusting.

Part 2 Piston 

Glyd Ring

El Glyd Ring is a high-performance hydraulic seal designed for use in press brake cylinders and other industrial applications. It features a low-friction design, ensuring smooth motion while maintaining a tight seal to prevent oil leakage. Made from PTFE-based materials, the Glyd Ring provides excellent wear resistance, making it ideal for high-pressure and high-speed operations. Its unique combination of an elastomeric O-ring and a PTFE sealing element ensures superior sealing efficiency and long service life. This makes it a reliable choice for CNC press brakes, improving operational stability and reducing maintenance costs in hydraulic systems.

The Glyd ring consists of an O-ring and a sealing ring. Install the O-ring first, then snap the sealing ring into the groove with the aid of a one-piece screwdriver. Take care not to scratch the sealing ring. Finally, turn the piston over.

Part 3 Combination

Plug the three process holes in the cylinder tube.

Before installation, spray hydraulic oil to lubricate and prevent rust.

Guide Belt

El guide belt in a press brake plays a crucial role in ensuring precise and stable bending operations. It provides smooth and controlled movement of the ram, reducing friction and wear while maintaining accuracy. Made from durable, high-strength materials, the guide belt helps extend the machine’s lifespan and improves overall performance. Regular inspection and maintenance are essential to prevent misalignment and excessive wear, which could affect bending precision. A well-maintained guide belt ensures consistent, high-quality results in metal fabrication. Choosing the right guide belt for your CNC press brake is vital for achieving efficient and accurate bending processes.

Installing Guide Straps on the Piston with Hydraulic Oil

Before installing the guide straps, apply a thin, even layer of aceite hidráulico to the bottom of the piston. This lubrication helps reduce friction and ensures a smooth installation process. Once the surface is adequately coated, carefully place the two guide straps around the piston, ensuring they fit snugly and align properly. These straps play a crucial role in stabilizing the piston within the cylinder, preventing excessive wear and ensuring rendimiento óptimo of the press brake. After installation, inspect the alignment and confirm that the straps are secure before proceeding with further assembly steps.

Properly Positioning the Piston in the Cylinder

Carefully insert the piston into the cylinder, ensuring a smooth and controlled movement to avoid damaging the seal rings. Align the piston correctly so that its two screw holes are positioned facing the front and rear of the cylinder. This alignment is crucial for proper functionality and sealing performance. Once the piston is in place, check for any obstructions or misalignment before proceeding to the next step. Applying a small amount of hydraulic oil can help reduce friction and ease the installation process. Ensuring the correct positioning will enhance the overall efficiency and lifespan of the press brake cylinder.

Install the guide sleeve

Installing the guide sleeve correctly is crucial for ensuring the smooth operation and longevity of the CNC press brake’s hydraulic system. Begin by thoroughly cleaning the cylinder bore to remove any debris or old seal residue. Align the guide sleeve carefully with the cylinder opening and gently insert it, ensuring it is positioned evenly to prevent misalignment. Use a suitable tool or press to gradually push the sleeve into place, applying uniform pressure to avoid damage. Finally, double-check its positioning and secure it as needed before proceeding with the reassembly. A properly installed guide sleeve enhances sealing efficiency and reduces wear.

Screwed-On Cylinder Seal Rings in CNC Press Brakes

Screwed-on cylinder seal rings in CNC press brakes are designed for secure attachment and easy maintenance. These rings are threaded onto the cylinder, ensuring a tight seal that prevents hydraulic fluid leakage and maintains consistent pressure during bending operations. Over time, wear and tear may require replacement to maintain machine efficiency. Proper installation is crucial—ensure correct alignment and avoid overtightening, which can damage the seal. Regular inspection helps detect early signs of leakage or deterioration. When replacing, always use high-quality rings compatible with your press brake model to ensure optimal performance and extend the hydraulic system’s lifespan.

How To Remove the Guide Sleeve &Piston                     

The guide sleeve and piston can be removed, screwing two screws into the process hole and pulling it out with the aerial cart.

This is all for our tutorial and proper maintenance of hydraulic oil cylinders is important to ensure the function effectively and have a long service life. Here are some general maintenance tips for hydraulic oil cylinders:

1. Check the oil level regularly: The oil level in the cylinder should be checked regularly to ensure it is at the correct level. If the oil level is too low, it can cause damage to the cylinder.

2. Change the oil: Hydraulic oil should be changed regularly to prevent contamination and extend the life of the cylinder. The frequency of oil changes will depend on the application and operating conditions.

3. Check for leaks: Check for leaks in the cylinder regularly. If you notice any leaks, it is important to address them immediately. It is to prevent damage to the cylinder or other components of the hydraulic system.

4. Inspect the seals: Inspect the seals in the cylinder regularly for wear or damage. Replace any seals that are worn or damaged to prevent leaks and ensure the cylinder operates smoothly.

5. Keep the cylinder clean: Keeping the cylinder clean can help prevent contamination and damage. Use a clean cloth or rag to wipe down the cylinder regularly.

6. Use the correct oil: Use the correct hydraulic oil recommended by the manufacturer for your specific cylinder and application. Using the wrong oil can cause damage to the cylinder and other components of the hydraulic system.

By following these general maintenance tips, you can help ensure your hydraulic oil cylinders operate effectively and have a long service life.

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