Seal Kits

Hydraulic Seal Kits for Excavators and Heavy Machinery

Hydraulic seal kits contain the sealing elements required to repair or overhaul a specific hydraulic component. Instead of selecting individual seals one by one, a machine-specific kit provides a matched set intended for a defined application.

HPM Hydraulic offers an extensive catalogue of seal kits for excavators, construction machinery and hydraulic components, including kits referenced for manufacturers such as Komatsu, Hyundai and Kobelco.

What Can Be Included in a Hydraulic Seal Kit?

The contents depend on the component being repaired. A seal kit may include:

• piston seals,
• rod seals,
• wiper seals,
• O-rings,
• backup rings,
• wear rings,
• static seals,
• other application-specific sealing elements.

Not every kit contains the same seal types, so the part number and intended component should always be verified.

Seal Kits by OEM Number

For machine-specific repairs, the OEM part number is often the fastest and most accurate way to identify the correct seal kit.

HPM Hydraulic lists seal kits under exact reference numbers used in construction machinery. This is particularly useful when servicing equipment where multiple cylinder or component variants were fitted within the same machine series.

Seal Kits for Hydraulic Cylinders

Hydraulic cylinders use several different sealing functions at the same time. A cylinder repair kit may include separate seals for the piston, rod, gland and external contamination protection.

Before ordering a cylinder seal kit, identify:

• machine make and model,
• cylinder function,
• boom, arm or bucket application where relevant,
• OEM cylinder or seal kit number,
• machine serial range if specified.

Seal Kits for Pumps and Motors

Seal kits may also be used during hydraulic pump and motor repairs. These sets can contain static and rotating seals specific to the housing, shaft and control sections of the unit.

The full pump or motor model should be used because different versions within the same product family may require different sealing sets.

Why Replace the Complete Seal Set?

During an overhaul, replacing only the visibly leaking seal may leave other aged components in service. A complete kit can be a more practical option when the assembly has already been dismantled.

Replacing the appropriate seal set can help:

• reduce repeat disassembly,
• restore sealing across several interfaces,
• address age-related seal hardening,
• support a more complete component overhaul.

Before Installing a Seal Kit

A seal kit will not correct mechanical damage. Inspect the component carefully for:

• scored cylinder rods,
• damaged bores,
• corrosion,
• worn bearings or bushings,
• excessive shaft play,
• contamination inside the hydraulic system.

Installing new seals on damaged surfaces can cause rapid failure of the replacement kit.

How to Find the Correct Seal Kit at HPM Hydraulic

Use the website search with the OEM number, seal kit reference, machine model or component number. Exact part numbers are particularly useful because the Seal Kits category contains a large number of machine-specific products.

If the reference cannot be identified, provide the machine details and photographs of the component being repaired.

Seal Kits for Hydraulic Component Rebuilding

Seal kits are commonly used during repairs of hydraulic pumps, hydraulic motors and hydraulic cylinders.

Always match the kit to the exact component or OEM reference before installation.

FAQ – Hydraulic Seal Kits

What is included in a hydraulic seal kit?

The contents vary by application and may include piston seals, rod seals, wipers, O-rings, backup rings and other component-specific seals.

Can I select a seal kit only by excavator model?

Not always. Machines of the same model can use different component variants, so the OEM or component reference is preferable.

Should all seals be replaced during a cylinder overhaul?

When the cylinder is fully dismantled, replacing the appropriate complete seal set is often more practical than replacing only one aged seal.

Why does a cylinder still leak after fitting a new seal kit?

Possible causes include rod damage, bore wear, incorrect assembly, contamination, excessive pressure or an incorrect kit.

How can I find a seal kit by part number?

Enter the complete OEM or manufacturer part number in the HPM Hydraulic search field and compare the result with the machine and component application.