Eccentric Wearing Plate for CH/CS Series Cone Crushers 

Sandvik CH/CS Eccentric Wearing Plate: Precision Bronze Thrust Components

The Eccentric Wearing Plate (Bronze Thrust Washer) is the axial load-bearing interface for the eccentric assembly in Sandvik CH (Hydrocone) and CS Series cone crushers.
Unlike standard wear parts, this component does not crush rock; it supports the rotating weight of the eccentric assembly (~500kg – 2000kg depending on model) while managing the friction against the stationary steel bottom shell bushing.

For mining maintenance planners sourcing from crusher part suppliers, the metallurgical consistency of this bronze plate is critical.
It acts as a sacrificial bearing surface, preventing the expensive eccentric casting from grinding against the frame.
Our components are engineered to maintain the precise vertical height of the eccentric, which directly dictates the Gear Backlash and drive train longevity.

Core Engineering Advantages

• Low-Friction Metallurgy: Manufactured from High-Tin Bronze (UNS C90700 / SAE 65).
  This alloy is selected for its low coefficient of friction and high load-bearing capacity, capable of sustaining the eccentric’s weight under high-speed gyration (300+ RPM).
• Embeddability: The bronze structure is engineered to allow microscopic debris (silica/metal fines) to embed into the surface rather than scoring the mating steel wear ring, protecting your crusher spares investment.
• Dimensional Precision: CNC machined to a thickness tolerance of ±0.02mm.
  Maintaining exact thickness is vital; if the plate is too thin, the eccentric drops, tightening the gear backlash and causing potential tooth failure.

Technical Specifications & Material Composition

We utilize centrifugal casting methods to ensure a dense, defect-free grain structure, superior to static sand casting.

Performance & Wear Analysis

Using premium centrifugally cast bronze plates offers distinct operational benefits:

• Heat Dissipation: The C90700 alloy provides superior thermal conductivity, helping to transfer frictional heat away from the eccentric bushing interface during operation.
• Extended Service Intervals: Comparative field data indicates a 15-20% longer wear life compared to standard sand-cast plates, reducing the frequency of major teardowns.
• Stable Gear Mesh: By resisting deformation (“creep”) under load, our plates ensure the bevel gear and pinion remain in their correct contact position for longer periods.

Field Diagnosis: When to Replace the Eccentric Wearing Plate?

Since this part is buried deep inside the crusher, external diagnosis is key. Look for these signs:

• Reduced Gear Backlash: This is the #1 indicator. As the wearing plate thins, the eccentric assembly drops.
  If your backlash measurement decreases significantly between services, the wearing plate is likely worn out.
• Bronze Glitter in Oil: While some bronze is normal from bushings, “chunkier” bronze flakes in the return oil filter often indicate the thrust interface (wearing plate) is disintegrating.
• Vibration Change: If the eccentric drops too low, it may contact the bottom shell ribs, causing a distinct, rhythmic thumping vibration.

Expert Engineer’s Note: Installation & “Stack Height”

Critical Maintenance Advice: When replacing the Eccentric Wearing Plate, you are effectively resetting the height of the eccentric assembly.
You must re-check the gear backlash immediately after installation.
Do not assume the new plate is identical to the old one (when it was new).
Ideally, measure the “Stack Height” of the steel and bronze wear plate combination.
If the total height differs from OEM specs, you may need to adjust the gasket thickness under the eccentric bushing or shim the pinion to correct the gear mesh.
Always lubricate the plate with clean oil before installation to prevent “dry start” scoring.