How to Inspect & Replace Tungsten Carbide Spectacle Plates

The spectacle plate and cutting ring form the heart of the concrete pump switching mechanism. When these components wear unevenly, concrete backflow reduces pumping volume and strains hydraulic cylinders. ### Signs of Excessive Wear - Slurry splashing upwards through the hopper during S-tube shift. - Slower cylinder cycling speeds due to internal pressure bleed. - Visible gouges or chipped tungsten carbide inserts along the Kidney opening perimeter. ### Best Practices for Installation Always replace the rubber spring buffer behind the cutting ring whenever a new spectacle plate is fitted. Ensure the mating surface of the hopper wall is wire-brushed clean before torquing mounting studs.