KB63-89 O Ring RD 1370-1660 For Gyratory Crusher 4350712

Technical Specifications: Bronze O-Ring RD (Item 4350712)

The O-Ring RD (Item 4350712) is a specialized metallic sealing interface used in the Thyssenkrupp KB Series Gyratory Crushers. Unlike elastomeric seals which degrade under high heat, this 37kg bronze ring provides a durable, non-galling seal gap, typically positioned within the dust seal or eccentric assembly.

Core Advantages: Centrifugal Bronze vs. Fabrication

For large-diameter sealing rings (1.6 meters), structural stability is the primary engineering challenge. Many crusher part suppliers attempt to fabricate these rings by bending bronze bars or using sand casting, which leads to warping and “out-of-round” issues during operation.

We utilize Centrifugal Casting technology for the O-Ring RD. By spinning the mold at high G-forces, we achieve:

• Perfect Concentricity: The centrifugal force naturally aligns the molten metal, ensuring the ring remains perfectly round (Run-out < 0.1mm).
• Material Purity: Lighter impurities (oxides/slag) are forced to the bore and machined away, leaving a 100% dense bronze matrix.
• Self-Lubrication: The ZCuPb20Sn5 alloy contains highly dispersed lead. If the mating surface touches this ring, the lead acts as a solid lubricant, preventing the “galling” that ruins steel housing components.

Performance Comparison: Metallic vs. Elastomer

In the high-temperature environment of a primary gyratory crusher, metallic sealing offers superior reliability compared to rubber alternatives.

Field Diagnostic & Maintenance Tips

Even though this is a static or semi-static wear part, it requires inspection during major teardowns.

1. Flatness Check (The “Potato Chip” Effect): Because this ring is large (1660mm) but relatively thin (weighing only 37kg), it is susceptible to warping if mishandled. Lay the ring on a verified flat surface plate. If you can insert a 0.3mm feeler gauge under any section, the ring is twisted and will not seal effectively.

2. Erosion Patterns: Inspect the inner diameter. If you see “washing” or erosion marks, it indicates that the dust seal air pressure or grease purge is too high, creating turbulence that is eating away the soft bronze.

Quality Assurance

Ensuring a 1.6-meter ring fits perfectly requires strict QC protocols:

• Dimensional Laser Scan: We verify the ID/OD circularity to ensure it drops into the housing groove without forcing.
• Material Certification: Each batch is tested to confirm the Lead (Pb) content is between 18-23%, critical for the anti-friction properties.

Expert Note on Availability

From the Engineer’s Desk: The RD 1370-1660 is a niche but vital component. Using a ring with incorrect chemical composition can lead to galvanic corrosion or rapid wear of the mating steel parts. Our ZCuPb20Sn5 alloy is chemically balanced to be sacrificial yet durable.

As a manufacturer of crusher parts, we specialize in hard-to-find crusher spares. We ensure that even lightweight, large-diameter components like this O-Ring RD are packaged in rigid steel frames to reach your mine site in perfect condition.