562-50-3A210 562503A210 PU Metal Composite Dust Wiper Seal for Wheel Loader Boom & Bucket Cylinder Rod Protection HD1500-8

Q: Which wheel loader models and hydraulic cylinder rods does this 562-50-3A210 dust wiper seal fit, and where is it installed on the cylinder?
A: This skeleton dust wiper seal matches medium and large wheel loaders, mounted inside the outer end cover groove of boom cylinder and bucket cylinder. It is the outermost sealing component of the piston rod, responsible for scraping off mud, sand, dust and moisture attached to the reciprocating rod surface, preventing external pollutants from invading the internal hydraulic sealing system. The integrated metal skeleton design realizes one-piece press-fit installation without separate assembly of scattered parts.

Q: What unique protection advantages do PU lip, steel skeleton and NBR elastic ring three-layer composite structure bring to wheel loader rod dust prevention?
A: Wheel loaders work in sand, gravel and muddy yards all year round, piston rods reciprocate frequently with high linear speed and are continuously impacted by sediment erosion. The PU scraping lip has ultra-high wear resistance and low friction, maintaining tight fit with the rod surface for long-term efficient dust scraping without edge curling. The outer steel skeleton provides rigid structural support to avoid deformation and extrusion damage of the PU lip under impact. The built-in NBR elastic ring keeps consistent radial pre-tightening force, ensuring the wiper always fits closely with the rod even after long-term temperature changes, blocking tiny dust gaps. The three-layer structure forms the first line of defense to protect internal rod seals and cylinder barrels.

Q: What color and structural appearance features does each component of this dust wiper seal have?
A: The outer metal skeleton is matte silver gray with uniform round ring outline, smooth press-fit outer wall. The inner scraping PU lip is solid black with single sharp scraping edge and smooth contact surface. The embedded NBR elastic ring is dark black, tightly clamped between steel shell and PU layer without separation. The whole wiper is integrated circular press-in type, with unified standard outer diameter and inner lip size, convenient for direct press mounting into cylinder end cover grooves during maintenance.

Q: What stable working temperature and reciprocating speed range can this composite dust wiper seal adapt to?
A: This skeleton dust wiper can bear continuous reciprocating speed up to 1.2m/s. PU and NBR components work stably within -33°C ~ +118°C, the steel shell resists thermal expansion and contraction without deformation. It can maintain reliable dust scraping performance in low-temperature muddy loading in winter and long-hour full-load material shoveling in summer, without lip wear, hardening or dust penetration failure.