568-15-12840 5681512840 Manufacture Wholesale Selling Seal Rings,fits for D155AX-3 D155A-5

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5. FAQ

Q: The gearbox/transmission has been opened. After inspection, I found that only two parts are damaged. Can I replace only these two parts and leave the rest as is?

A: Technically, yes, you can just replace the two broken parts, button the transmission back up, and it will likely work for a while.

However, in the heavy machinery and automotive world, doing this is highly risky. Since you already have the transmission completely open, mechanics almost always recommend replacing all the seals and rings using the full kit.

Q: Why do you recommend replacing all the seals and rings using the full kit?

A: Here is a quick breakdown of why only changing the two broken pieces might cause you trouble down the road:

• Even Wear: The other seals and rings in that transmission have been exposed to the exact same amount of heat, pressure, hours, and friction as the two that broke. If two have already failed, the others are likely very close to failing as well.
• The "Labor Tax": The hardest and most expensive part of a transmission repair is taking the machine apart and opening the transmission housing. If you put it back together now and a third old seal breaks next month, you have to spend hours doing all that hard teardown work all over again.
• Hidden Micro-Cracks: Hard plastic or PTFE (Teflon) rings can develop tiny, invisible hairline fractures from heat hardening. They might look completely fine to the naked eye right now, but the moment they are disturbed during your teardown and put back under pressure, they can split.

Q: What are common reasons for gasket failure?

A: The most frequent causes are dirty or scratched mating surfaces, uneven bolt torque, using the wrong gasket thickness, and reusing a gasket that has already been compressed.

Q: How long will a properly installed PTFE gasket last?

A: With clean surfaces and correct torque, it can last for years of continuous service. It only needs replacement when the joint is disassembled for maintenance.

Q: Can I reuse an old gasket?

A: No, it is not recommended. Once compressed, the material develops a permanent "compression set" and cannot conform to the mating surfaces again, even if it appears undamaged. Always install a new gasket during reassembly.

6. Exhibition and Wearhous

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