07018-21155 0701821155 SEAL RING FOR D475A-3 D375A-2 D41E-6,GD505A-3

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5. FAQ

Q: What is this piston seal ring and what does it do?

A: This is a metallic piston seal ring, commonly known as a bronze wear ring or piston ring, installed in hydraulic cylinders to support the piston, reduce friction, and prevent metal-to-metal contact between the piston and cylinder bore.

Q: What material is this piston seal ring made of?

A: It is typically made of high-grade bronze (tin bronze or leaded bronze), a copper-based alloy chosen for its excellent wear resistance, self-lubricating properties, and high load-bearing capacity.

Q: What are the advantages of bronze for this application?

A: Bronze offers low friction against steel cylinder bores, resists wear under heavy loads and side forces, maintains dimensional stability at high pressures, and has good corrosion resistance in hydraulic fluids.

Q: How do I install this piston seal ring correctly?

A: Expand the split ring carefully by hand or with a proper ring expander to avoid overstretching, slide it into the piston groove, ensure it sits flat without twisting, then stagger the ring gaps if multiple rings are used before assembling the piston into the cylinder.

Q: What common issues lead to bronze seal ring failure?

A: Common causes include poor lubrication, contaminated hydraulic fluid causing abrasion, excessive side loads, misalignment of the piston, and overstretching or damaging the ring during installation.

Q: How long does a bronze piston seal ring typically last?

A: Under normal operating conditions with clean fluid and proper alignment, a high-quality bronze ring can last 5,000–10,000 operating hours, depending on load and cycle rate.

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