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Understanding How Metric Oil Seals Work

Often referred to as fluid, grease, or dirt seals, oil seals are instrumental in bridging the gaps between stationary and moving components in mechanical devices. Their primary role is to retain lubricants, preventing them from escaping, while simultaneously barring contaminants from entering the machinery – an essential function, especially in challenging conditions. Furthermore, they ensure that different substances, such as lubricating oil and water, do not mix.

Customized hydraulic cylinder rebuild Utah seals can be designed for novel machinery types to complement their bearings. These seals play a crucial role in shielding various precision-based bearings, be it ball, sleeve, or roller bearings, across a diverse array of machinery, vehicles included. A metal ring situated internally grants structural stability to the oil seal, acting as its backbone.

The seal’s exterior layer is fabricated from a flexible material, often nitrile rubber, though the choice of material may vary based on the seal’s operational environment. A spring supports the seal’s lip, ensuring lubricant retention and barring external contaminants. Depending on the load and environmental conditions, the external layer might be crafted from silicone, fluoroelastomer (or Viton) for high-temperature resilience, Poly Acrylate, or Polytetra-FluroEthylene.

The shaft where the oil seal is placed should have a rough finish and be hardened, ensuring protection against grooves that might form due to the spring’s pressure. Moreover, the installation zone needs to be finely ground to thwart premature wear of the oil seal’s lip owing to grooves.

Oil seals come with a flexible lip that brushes against the shaft or housing to deter leaks. The spring ensures this lip remains in contact with the shaft. These dynamic hydraulic cylinder rebuild Utah seals, known as bearing isolator oil seals, consist of a rotor or rotating part and a stator or stationary segment, with the rotor synchronizing with the shaft’s movement. Some incorporate a “labyrinth” design, while others employ simpler O-rings.

Oil seals, also recognized as rotary shaft seals, function to bridge the gap between static and dynamic components, retaining lubricants and preventing contaminants from infiltrating the system. These seals come in various designs and materials, tailored to different applications and environments.

The choice of material and seal design hinges on the application and the medium interacting with the seal. The staple construction of an oil hydraulic cylinder rebuild Utah seal comprises an internal metal ring for structural stability. Its exterior, crafted from either metal or rubber, is based on the seal’s function and specifications.

A spring supports the lip of the oil seal, preventing lubricant leakage and external contaminant infiltration. Some seals feature a dust lip that shields the sealing lip, repelling dirt and dust, thus extending the seal’s lifespan. Positioned on the seal’s inner diameter, an oil seal with a dust lip is often termed a double lip oil seal. Many oil seals also incorporate a garter spring, a circular spring that ensures the sealing lip exerts radial force on the shaft’s surface.

Understanding the Functionality of Oil Seals

Oil seals, specifically radial oil seals which are prevalent, operate by forming a slim oil barrier between the shaft and the sealing lip made of rubber. This action propels the sealing lip away from the shaft, courtesy of the oil layer. The resulting oil barrier acts as a defense, ensuring oil doesn’t escape past the sealing lip. Hence, for applications that entail dry running or are subject to high pressure, rubber oil seals might not be the ideal fit.

The two predominant categories of oil seals are metal-cased and rubber-cased.

Metal-Cased Oil Seals

Employed predominantly when the installation is within a housing bore of identical material, metal-cased oil hydraulic cylinder rebuild Utah seals allow for uniform expansion and contraction of the materials during operation. This uniformity effectively curbs leakages. Generally, metal-cased seals are more economical than their rubber counterparts.

Rubber-Cased Oil Seals

These are the standard versions of oil seals, primarily used when there’s potential for metal-cased seals to fail, perhaps due to thermal expansion. One advantage of rubber-cased seals is their resistance to rust, unlike their metal-cased counterparts. Additionally, if a housing has minor damages, rubber-cased seals can effectively seal it, offering a superior fit and sealing capability than metal-cased seals, especially under elevated pressures and temperatures.

The ‘Type R’ is a widely accepted variant. This design incorporates a carbon steel insert with an external rubber diameter. The rubber ensures proficient sealing, even when housings are not perfectly aligned. The sealing lip, equipped with a spring, exerts pressure on the shaft, ensuring effective sealing. This design also allows for press-fitting within the housing, with adequate rubber interference to guarantee static sealing.

The sealing component is crafted from a high-grade nitrile rubber. Coupled with a top-quality galvanized steel garter, the seal enjoys a prolonged lifespan. For optimal functionality and to prevent leakages due to hydrodynamic pumping effects, it’s vital that the sealing lip’s contact region on the shaft or sleeve remains devoid of any machining traces.

Oil seals come in various lip designs, including:

Single Lip Design

This design incorporates a garter spring and is typically used for sealing against internal media in lower-pressure scenarios. However, it’s not ideal for environments filled with contaminants or dirt.

Double Lip Design

Employing a garter spring, this design features a primary hydraulic cylinder rebuild Utah sealing lip that acts against internal media in applications with lower pressure.

Rod Seals

These seals hold paramount importance in any fluid power apparatus, acting as barriers that prevent the escape of fluid from the cylinder’s interior to its exterior.

The primary materials employed in crafting rod seals include blends of PTFE and polyurethane.

Purpose of Rod Seals

Rod seal leaks can compromise equipment performance and, in severe instances, lead to environmental concerns. For optimal sealing performance, the hydraulic cylinder rebuild Utah rod seal and wiper should be harmoniously paired. When an aggressive rod seal is paired with a similarly aggressive wiper, the minuscule oil film left on the rod — existing in microscopic surface irregularities during the return motion — can be stripped away by the wiper, resulting in a leak in the system.

Rod seals come in an array of designs suitable for both single-acting and double-acting systems. Additionally, rod seals play a pivotal role in averting environmental pollution, thanks to the collaborative function of a wiper seal.