It is crucial to comprehend the role that hydraulic seals play in hydraulic systems before putting them in. To stop the leakage of hydraulic fluid, these seals are used in components such as pumps, valves, and cylinders. High-pressure hydraulic fluid is used in these systems to transfer power. While dynamic seals permit movement while yet preventing leakage between moving elements, static seals keep hydraulic fluid in place at stationary portions.
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Preparing the Surface
Proper preparation of the sealing surface is essential for seals to perform their job of preventing fluid escape. Clean away debris and residue completely using a degreaser. Then carefully smooth rough spots with fine-grit sandpaper. Inspect for cracks or deep grooves and replace defective parts. The surface must be flawless and burr-free so the seal makes full contact and does its job barricading hydraulic fluid exactly where it is needed.
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Handling the Hydraulic Seal
Take care when handling the hydraulic seal itself. Seal materials like rubber can be damaged if folded, creased, or handled roughly. Inspect for defects before installing. Lubricate the outer diameter of static seals with a seal installation lubricant to ease installation. This type of lubricant is designed to burn off once in use, leaving a clean seal surface. For dynamic shaft seals, coat just the sealing lip, not the entire seal, with lubricant.
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Installing the Hydraulic Seal
With preparation complete, focus on a smooth, even installation of the hydraulic seal. For seals going into bores or grooves, push or slide the seal squarely into place using a seal insertion tool if available. Avoid tilting which could warp the seal. For shaft seals like O-rings, stretch the seal slightly as you work it over the component. Stop stretching once fully in place to allow it to regain its original shape and form a tight seal. Check that the seal is fully seated and not twisted or cocked before continuing the reassembly of the component.
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Testing and Inspection
After installing new hydraulic seals, thoroughly inspect the sealed area for potential defects or issues before filling it with hydraulic fluid and putting the system into operation. Look for twisting, cuts, or other seal damage. Assemble and disassemble a few times if possible while inspecting. Once filled with fluid, operate the system gradually at low pressure while monitoring for signs of leakage. Check seal areas with a bright light. Replace any seals that show cuts or tears from installation or are not preventing leaks. Regular system inspection and replacement of worn seals help avoid costly hydraulic fluid contamination or system damage.
Following guidelines for cleaning surfaces, handling seals carefully, and making smooth installs helps ensure new hydraulic seals form an effective barrier against leaks. But seals remain one of the most failure-prone components due to harsh operating conditions like high pressures, friction, and contamination exposure.
Regular system inspection and timely replacement of worn seals before leaks develop further are important. Using high-quality seals appropriate for the application also increases service life. With careful installation and conscientious maintenance, hydraulic seals can perform their critical function of keeping expensive hydraulic fluid exactly where it needs to be for long-term system performance and reliability.
