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Hydraulic Cylinder Repair Near Me Hydraulic Seals find extensive usage within hydraulic machinery, primarily serving the purpose of sealing openings between various component parts. Most hydraulic seals are comprised of soft, non-metallic rings that are either situated in grooves or fixed in place.

The significance of seals in Hydraulic Cylinder Repair Near Me hydraulic systems cannot be overstated, as they effectively reduce the rate of fluid loss in hydraulic machines. Consequently, these seals play a vital role in ensuring the proper operation of the machinery.

Three of the most commonly encountered types of hydraulic seals are piston seals, rod seals, and RFD rod seals.

Piston Seals:

Piston seals in Hydraulic Cylinder Repair Near Me hydraulic machinery are designed to prevent the passage of fluid as the piston descends into the cylinder. These dynamic hydraulic seals come in various configurations:

Single-Acting Piston Seals:

  • Single-acting piston seals operate in displacement-type hydraulic cylinders that function in a unidirectional manner. These seals cover only one side of the piston where pressure is applied.

Single-acting Hydraulic Cylinder Repair Near Me cylinders employ gravity or a spring mechanism to move the rod and return it to its resting position. An example of this can be seen in vehicle hoists.

The choice of seal for the environment in which the single-acting piston is deployed is crucial. In many instances, single-acting cylinders supply hydraulic oil to only one side of the piston, leaving the opposite side exposed to the atmosphere. In such cases, the open side of the cylinder draws in air, often carrying contaminants. Therefore, selecting a seal that is suitable for the external environment is of utmost importance.

Double Acting Piston Seals:

  • Double-acting piston seals close off two opposing sides of a piston. Typically, these seals consist of a slide ring and an energizer. The elastomeric energizer provides the necessary force to maintain sealing contact with the cylinder bore.

Double-acting cylinders typically contain the same fluid on both sides of the piston. This allows for the use of thick lubrication films between the piston seal and the cylinder bore to minimize wear and tear.

Pressure from both sides is required to drive the piston along the bore. Hence, a double-acting seal that applies pressure from both sides is essential for effective protection. Although, in certain situations, two single acting seals arranged adjacently can create a double acting system of seal. 

Rod Seals:

The efficiency of hydraulic systems relies on the effectiveness of rod seals, as they prevent leakage from Hydraulic Cylinder Repair Near Me hydraulic cylinders and safeguard the cylinder from external contaminants.

Various Types of Rod Seals:

  • RFD Rod Seals: These are heavy-duty seals constructed from rubberized fabric.
  • RTA Rod Seals: Functioning as single-acting seals, RTA rod seals feature small groove dimensions and work in conjunction with NBR O-rings and PTFE inner rings, enhancing sealing resistance to handle high-pressure levels.
  • RUB Rod Seals: Constructed from piston rods, RUB rod seals are single-acting seals equipped with additional O-rings that provide lubrication and protection against abrasions. Polyurethane RUB seals offer a resistance of 300 BAR, making them suitable for high-pressure systems.

Wiper Seals:

Hydraulic Cylinder Repair Near Me Wiper seals often collaborate with other sealing components and offer the advantage of allowing ramrods to pass through the inner bore of a seal while preventing leakage.

These seals play a crucial role in shielding hydraulic systems from contamination caused by external particles. Their function involves preventing dirt, moisture, and other detrimental elements from causing damage to cylinder walls, seals, and other critical mechanical components.

To ensure the proper functioning of wiper seals, they must be securely in place. Loose wiper seals can result in component failures within the fluid power system and other critical parts.

Most wiper seals are manufactured using polyurethane and include a secondary lip that captures any oil seeping through the main seal while also wiping contaminants from the rod surface.

In summary, hydraulic seals are indispensable components in the operation of hydraulic machinery, available in various types such as piston seals, rod seals, and wiper seals. These seals are instrumental in making hydraulic machinery function smoothly.

If you encounter issues with your hydraulic pump or motor, or if it has failed, you can rely on the expertise of Servo Kinetics in Ann Arbor. With over 45 years of experience in industrial hydraulic repair services, we offer top-quality hydraulic repairs at competitive prices and provide prompt turnaround times.

Our range of hydraulic repair services includes Vickers classic factory rebuilds, Beach Russ repair, reverse engineering services, new pumps and motors, and more. Get in touch with one of our hydraulic experts today for a reliability-centered maintenance check.


Hydraulic cylinder repair becomes a manageable task when you possess a grasp of how hydraulic cylinders function, or at the very least, an understanding of the roles played by O-rings and rubber seals in facilitating the cylinder’s operation. This blog post is tailored for those in the latter category, as it delves into the typical sealing components that enable the functionality of a hydraulic cylinder. It’s imperative to keep in mind that when undertaking hydraulic cylinder repair, you must have a method for disassembling the cylinder components, including the rod and glands within the casing, as repairing a hydraulic cylinder is not feasible without this disassembly.

Rod wipers: Among the initial sealing components you encounter during hydraulic cylinder seal repair are rod wiper seals. The primary function of rod wiper seals is to cleanse the hydraulic cylinder rod before it re-enters the casing. This cleansing action is essential in preventing the ingress of dirt and other abrasive contaminants into the hydraulic fluid, thereby safeguarding the rod itself and the buffer seals from damage.

Rod seals: Rod seals play a pivotal role in thwarting hydraulic fluid leakage from the rod of a hydraulic cylinder. Similar to rod wiper seals, they also contribute to the protection of hydraulic fluid against contamination.

Rod wear rings: These components, also known as wear bands, are not primarily designed for sealing purposes. Instead, their function revolves around guiding both the piston and the rod within the casing. These bands act as safeguards, preventing structural damage to the cylinder’s gland located inside the casing.