Manžeta 18mm

The hard 18 mm 18x26x5.5 seal is a sealing element used in pressure washer pump assemblies, where precise fit in the gland and stable operation at high pressure are required. In service practice, it is used during pump rebuilding and hydraulic-system repairs when a worn seal causes leaks or deterioration of operating performance.

MPN / reference: 410131
Size: 18x26x5.5
Type: hard seal

APPLICATION

The seal is used in typical service work:

• sealing the hydraulic section of the pump,
• repairing leaks in sealing seats,
• rebuilding pumps during inspection or overhaul,
• replacing worn sealing elements in systems operating under high pressure.

SYMPTOMS - WHEN REPLACEMENT IS RECOMMENDED

It is worth replacing the seal when the following appear:

• water leaks around the pump or sealing housing,
• drop in working pressure despite proper accessories,
• damage, flattening, or hardening of the sealing edge after disassembly,
• recurring leakage after previous service,
• signs of uneven seal operation in the gland.

HOW TO CHOOSE THE RIGHT PART

Selection of the seal should be precise:

• verify the 18x26x5.5 size,
• confirm the manufacturer number: MPN 410131,
• compare with the removed part: profile, height, and seating method in the gland.

In high-pressure systems, even a small dimensional difference can cause leakage or faster seal wear.

COMPATIBILITY

The seal should be selected based on MPN 410131 and the 18x26x5.5 size, according to the parts list for the specific pump or assembly. Selection should not be based solely on the general description of the seal without confirming compatibility in the service documentation.

[faq]

For a 18x26x5.5 seal, is the diameter the most important thing, or the full profile?|The full size and seal profile are critical. The 18 mm diameter alone does not guarantee a correct fit if the height or geometry of the seal differs from what is required in the specific gland.

Why can a hard seal wear unevenly?|Most often, the cause is a worn gland, an uneven cooperating surface, or non-axial operation of the pump components. This leads to uneven loading and faster wear on one side of the seal.

When replacing the seal, is it worth checking the valves and pistons too?|Yes, especially if the symptoms include pressure drop or recurring leaks. In service practice, checking the entire pump section helps avoid a situation where a new seal works together with damaged mating components.

Can a hard seal be damaged while pressing it into the gland?|Yes. The most common issues are cutting the edge, misalignment, or damage to the working profile when installing into a dirty or sharp-edged gland. That is why installation should be clean and even.

How can I tell that a new seal has been chosen incorrectly?|Most often by a quick return of leakage, difficulty seating it correctly in the gland, or unstable system operation shortly after installation. In that case, it is worth re-checking MPN 410131 and the exact part dimensions.

[/faq]