cone crusher Eccentric bushing 1022075464 for Metso HP Series Cone Crushers

Metso HP Series Eccentric Bushing: 1022075464 Replacement

The eccentric bushing is the critical interface in the kinematic drive train of Metso HP series cone crushers. It converts the rotary motion of the countershaft into the gyratory motion of the main shaft. For high-throughput models like the HP600 and HP800, this component must withstand significant radial loads while maintaining a stable hydrodynamic oil film. Our aftermarket replacement for part number 1022075464 is engineered to meet these rigorous demands through superior metallurgy and precision manufacturing.

As one of the trusted crusher part suppliers, we reject the use of standard sand-cast bronze which often suffers from porosity. Instead, we utilize Centrifugal Casting technology. This process exerts high G-forces during solidification, pushing impurities to the bore (which are then machined away) and resulting in a dense, defect-free grain structure. This density is crucial for preventing fatigue cracking under the cyclic loading of hard rock crushing.

Metallurgy: Why ASTM C93700 High-Leaded Bronze?

Unlike general-purpose gearing bronze (such as Aluminum Bronze), the eccentric bushing requires a material with high anti-seize properties. We manufacture this part using C93700 High-Leaded Tin Bronze. The inclusion of 9-11% lead allows for microscopic pools of free lead within the copper matrix.

• Emergency Lubrication: Under extreme crushing loads or during start-up, if the oil film momentarily ruptures, the lead smears across the main shaft, creating a solid lubricant barrier that prevents catastrophic metal-to-metal welding (galling).
• Embeddability: The material hardness (65-80 HBW) is carefully controlled to allow abrasive particles (silica/dust) to embed into the bronze rather than scoring the expensive steel main shaft.

Field Diagnosis: Indicators for Bushing Replacement

Proactive maintenance prevents costly crusher failures. Engineers should monitor the following signs to determine the health of their crusher spares:

1. Thermal Spikes (>60°C Differential)
Monitor the return oil temperature. If the differential between the supply and return oil exceeds 8°C (standard is typically 3-5°C), friction is increasing. A sudden spike often indicates that the bushing has lost its internal geometry or that the oil grooves are clogged.

2. The “Lead Wash” Effect
Inspect the oil filter elements. The presence of fine, grey, non-magnetic paste indicates “lead wash”—the sacrificial wearing of the lead content. However, the presence of distinct bronze flakes or “glitter” suggests structural delamination, requiring immediate shutdown.

3. Decreased Throw (No-Load Spin)
If the crusher head spins faster than normal under no-load conditions (Counter-rotation), it indicates the bushing clearance has tightened due to thermal expansion or warping, dragging the head along with the eccentric.

Installation Best Practices: Cryogenic Fitting

Correct installation is paramount for component longevity. Do not use hydraulic presses or sledgehammers to install this bushing, as force can distort the precision bore.

[Option B: Pro-Tip] The industry-standard method for installing the 1022075464 bushing is via Thermal Contraction (Freezing). Use Liquid Nitrogen or Dry Ice/Alcohol slurry to cool the bushing to approximately -70°C. This will shrink the outer diameter by roughly 0.08mm – 0.10mm, allowing it to drop freely into the eccentric bore. Ensure the oil holes are perfectly aligned before the temperature equalizes and the interference fit locks the part in place.

Quality Assurance

Every bushing undergoes a strict quality control regimen:

• Dimensional Check: CMM verification of the eccentric throw and bore concentricity.
• Surface Finish: Inner bore honed to Ra 0.8 μm to facilitate immediate oil wedge formation.
• Material Traceability: Spectrometer analysis reports provided with every batch verifying Cu, Sn, Pb, and Zn content.

Designed for aggregate producers and mining operations demanding high availability, this eccentric bushing restores the original kinematic performance of your Metso HP cone crusher.