195-15-81240 1951581240 Original Construction Machinery Parts Seal O-Ring D375AI-8 D375AI-8E0

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5. FAQ

Q: Why are these materials chosen?
A: FKM/fluorosilicone rubber offers exceptional resistance to heat, engine oils, and aggressive hydraulic fluids, making them ideal for demanding applications. They maintain their elasticity and sealing force even under prolonged compression and high temperatures. The PTFE/nylon backup ring prevents the O-ring from being squeezed into the clearance gap under high pressure, adding stability and extending the seal’s service life.

Q: What is the correct installation process?
A: Start by thoroughly cleaning the liner/housing bore and the O-ring grooves to remove all dirt, oil, or debris. Inspect the surfaces for scratches, burrs, or corrosion that could damage the seals. Fit the black backup ring into the groove first, then install each red O-ring, making sure they sit flat and are not twisted or overstretched. Lubricate the seals with clean, compatible fluid. When inserting the liner into the housing, use a tapered installation sleeve to protect the O-rings from catching on the bore edge.

Q: What common installation mistakes lead to early failure?
A: Not fully cleaning the surfaces leaves grit that abrades the O-rings. Installing the O-rings twisted or overstretched creates hidden damage that causes leaks under pressure. Forgetting the backup ring allows the O-ring to extrude into the gap and fail. Skipping the tapered sleeve damages the seals during liner insertion.

Q: How long can these parts last if installed correctly?

A: With proper installation, clean lubricant, and correct clearance settings, the oil seal can last 5,000–10,000 operating hours, while the metal shims will typically last the life of the assembly unless they are damaged during service.

Q: Can I reuse the old shims?

A: While the shims themselves don’t wear out, it’s best to use new ones if possible, especially if they are bent, scratched, or have been deformed during disassembly. Reusing old shims can lead to incorrect clearances if they are damaged, so always inspect them carefully before reuse. The oil seal, however, should always be replaced with a new one during service.

6. Exhibition and Wearhous

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