Metso HP400 Upper Head Bushing | 1022147349 | Bronze Crusher Spares

Metso HP400 Upper Head Bushing: Precision Bronze Bearing | 1022147349

The Upper Head Bushing (Part No. 1022147349) is the primary radial bearing interface for the upper section of the Metso HP400 Cone Crusher Head.
Pressed into the Head Ball, this bronze bushing works in tandem with the Lower Head Bushing to support the crushing head as it rotates around the eccentric.
Unlike generic crusher spares, our bushing is engineered from High-Lead Tin Bronze to provide the critical “embeddability” required to protect the stationary eccentric shaft from scoring during high-speed operation.

For mining maintenance teams sourcing from crusher part suppliers, metallurgical correctness is non-negotiable.
Using the wrong alloy (e.g., aluminum bronze) in this application will cause catastrophic “burn-up” of the eccentric assembly.
Our bushings are centrifugally cast to ensure a dense, defect-free grain structure capable of sustaining the HP400’s high crushing forces.

Core Engineering Advantages

• Anti-Friction Metallurgy: Manufactured from UNS C93700 (SAE 64) High-Lead Bronze. The 20% Lead content acts as a solid lubricant, allowing the bushing to survive momentary lubrication lapses (start-up/shut-down) without welding to the steel shaft.
• Centrifugal Casting: We utilize centrifugal casting technology (spinning at 800+ RPM during pouring). This forces impurities to the inner diameter (which is machined away) and compacts the grain structure, increasing the compressive yield strength by 15-20% compared to sand casting.
• Precision Interference Fit: CNC machined to a strict interference tolerance. This ensures the bushing remains locked in the Head Ball even as the head expands due to thermal operating temperatures (up to 80°C).

Technical Specifications & Material Grade

We adhere to strict ASTM and ISO standards for dimensional accuracy and material composition.

Performance & Wear Analysis

Replacing worn bushings with premium centrifugally cast spares restores the geometric stability of the crushing head:

• Shaft Protection: The soft leaded bronze is designed to be sacrificial. If abrasive dust enters the oil, particles embed into the bushing rather than scratching the expensive Eccentric Shaft.
• Thermal Conductivity: High-grade copper alloy ensures rapid heat dissipation, preventing “hot spots” that can lead to bushing spin and head damage.

Field Diagnosis: When to Replace?

Head bushings wear internally. Monitor these signs to avoid shaft damage:

• “Head Spin”: If the crushing head spins rapidly (approaching countershaft speed) when the crusher is running empty, the bushings are seizing against the eccentric shaft. Immediate shutdown is required.
• Burnished Spots: During a liner change, inspect the bushing ID. Dark, burnished, or blue patches indicate the oil film has broken down (overheating).
• Clearance Limit: Measure the ID with a micrometer. If the running clearance exceeds the OEM limit (typically +0.4mm to 0.6mm over nominal), replace the bushing. Excessive clearance causes “Head Wobble” and seal failure.

Expert Engineer’s Note: Cryogenic Installation

Critical Maintenance Advice: You cannot hammer this bushing in.
The Upper Head Bushing (1022147349) is an interference fit.
You must use Liquid Nitrogen (or Dry Ice) to shrink the bushing for at least 2 hours before installation.
The Head Ball should be at ambient temperature.
Drop the bushing in quickly; it will expand and lock instantly as it warms.
Do not use heat on the Head—this can distort the spherical seating surface.
After installation, verify the bushing has not “grown” axially and sits flush.