421-46-37170 4214637170 Piston Rod Seal Service Kit for Large Articulated Dump Truck Hoist Cylinder WA480-5 WA470-5

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5. FAQ

Q: What four different core raw materials form all the sealing components inside this rod seal kit?
A: The whole repair set consists of high compression resistant cast PU, silica powder compound modified PTFE, heat-stable AEM acrylic rubber and aramid cloth base resin impregnated wear-resistant guide fabric.

Q: What natural original color does each sealing component keep without extra artificial dyestuff or surface paint?
A: Cast PU rod main seals are pale cream white, silica-filled PTFE anti-extrusion back-up rings are light stone gray, AEM auxiliary static seals are faint beige, aramid phenolic fabric wear rings are russet tawny brown.

Q: What primary sealing duty does cast PU take on the dump truck’s hoist cylinder piston rod?
A: As the core dynamic rod sealing element, cast PU makes use of superior extrusion resistance and elastic resilience to block high-pressure hydraulic fluid leakage when the piston rod stretches out and retracts repeatedly to lift and tip the full-load cargo bed under heavy mine transport loads.

Q: What is the core design rationale for matching silica-filled PTFE as auxiliary back-up beside PU main rod seal?
A: It fills the narrow assembly clearance between rod seal and metal groove, prevents the edge of cast PU from being squeezed into tiny gaps under instantaneous hydraulic pressure spikes during sudden cargo bed tipping and avoids premature seal tearing failure.

Q: What outstanding practical advantages does AEM rubber possess compared with regular NBR nitrile rubber?
A: AEM features exceptional long-term heat and oil ageing resistance, maintaining stable dimensional stability after long-time contact with thermally oxidized contaminated hydraulic oil inside closed high-temperature cylinder cavities during round-the-clock mine haulage.

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