333-0960 3330960 PU PTFE Composite Piston Seal for Construction Excavator Hydraulic Cylinder Maintenance 140M 3 140M 2 12H

1. Quick Details of  seal 333-0960:

2. 333-0960  picture:

3. Service part number :

4. FAQ

Q: What core advantages does the PU-PTFE-NBR three-piece composite structure bring to piston sealing?
A: Excavator hydraulic cylinders work under long-term high pressure and frequent reciprocating friction. The PU main seal features strong wear resistance and high pressure resistance, and will not deform under continuous hydraulic impact. The PTFE ring reduces friction between the seal and cylinder barrel, lowers operating noise and avoids scratching the cylinder inner wall. The built-in NBR elastic ring provides lasting radial tension to keep the seal tightly attached to the cylinder wall and prevent internal oil leakage inside the cylinder.

Q: What color and structural features do each component of this piston seal have?
A: The outer PU main sealing ring is bright yellow, with double-lip sealing structure and smooth matte surface. The middle PTFE anti-extrusion ring is milky white thin flat ring, which can be fully embedded into the PU reserved groove. The inner NBR elastic energizer is solid black round rubber ring with uniform elasticity. All three parts are pre-assembled as a whole, convenient for on-site installation without separate matching.

Q: What pressure and temperature range can this piston seal adapt to?
A: This composite piston seal can bear continuous working pressure up to 420bar, and fits the temperature range of -35°C to +120°C. It can operate stably in low-temperature outdoor construction in winter and long-hour high-load operation in summer without lip peeling or elastic attenuation failure.

Q: What equipment failures will inferior piston seals trigger for hydraulic cylinders?
A: Low-cost piston seals use recycled inferior PU without PTFE protective layer. They wear rapidly after reciprocating friction, leading to internal oil leakage of the cylinder. The cylinder will show insufficient power, slow action and obvious shaking during operation. The worn debris will scratch the cylinder barrel inner wall, causing expensive barrel replacement cost and long equipment downtime.

Q: What standardized installation specifications should operators follow to extend seal service life?
A: First, thoroughly clean the piston groove and cylinder inner wall to remove metal particles and old seal residues. Second, lubricate the whole seal with clean hydraulic oil before installation, thick grease is prohibited. Third, use special installation tools to push the seal evenly into the piston groove, avoid twisting or scratching the PU sealing lip. Fourth, confirm the PTFE ring is fully embedded without warping before loading the piston into the cylinder barrel.

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