FLSmidth Raptor Cone Crusher Countershaft Bushing – Premium Bronze Spares

The Countershaft Bushing is a critical hydrodynamic bearing component for FLSmidth cone crushers, specifically the Raptor and legacy Fuller-Traylor series.
Positioned within the countershaft box, this bronze sleeve supports the pinion shaft, allowing it to rotate at high speeds (typically 800-1200 RPM) while transmitting torque to the main gear.
As a specialized manufacturer of bronze parts for crusher systems, we engineer these bushings to strictly control the oil wedge film, preventing metal-to-metal contact between the steel shaft and the bushing surface.

Our aftermarket bushings are not generic castings.
They are engineered using Centrifugal Casting technology, ensuring a density and grain structure superior to standard sand-cast alternatives.
This results in higher compressive strength and resistance to fatigue cracking under the shock loads of hard rock crushing.

Core Engineering Advantages

• Premium Metallurgy: Manufactured from C93700 High-Lead Tin Bronze (SAE 64).
  Unlike standard SAE 660, this alloy contains higher lead (8-10%) and tin (9-11%), offering exceptional lubricity and “conformability” – the ability to absorb minor shaft misalignments without seizing.
• Precision Oil Grooves: CNC-machined oil distribution grooves ensure a continuous lubricant film across the entire bearing surface, critical for dissipating the heat generated by friction.
• Centrifugal Purity: Our casting process eliminates internal porosity and blowholes, ensuring the bushing does not fail prematurely under heavy radial loads.

Technical Specifications

The following table outlines the material standards for our FLSmidth compatible crusher bronze parts.

Performance Comparison: Centrifugal vs. Sand Cast

Choosing the right manufacturing process directly impacts your maintenance budget.

• Wear Life: Centrifugally cast C93700 bronze provides 20-30% longer service life than sand-cast equivalents due to the finer, more uniform grain structure.
• Load Capacity: The absence of casting defects allows our bushings to withstand higher compressive shock loads without deforming or cracking.
• Scuff Resistance: The high lead distribution ensures excellent emergency lubrication properties during startup or temporary oil pressure drops.

Maintenance Diagnosis: Analyzing Bushing Failure

Your old bushing tells a story. Inspect it during removal to diagnose crusher health:

• Scoring/scratching: Deep circumferential grooves indicate contaminated oil.
  Check your filtration system and breathers immediately.
• Burnishing (Polishing) on one side: Indicates shaft misalignment.
  Check the countershaft box alignment or bent pinion shaft.
• Discoloration (Blue/Black): Signs of overheating (>150°C).
  This suggests lubrication failure or insufficient clearance (clamping).

Expert Installation Note: When installing a new countershaft bushing, generally a “shrink fit” is required using dry ice or liquid nitrogen.
Do not use a sledgehammer. Forceful impact can distort the soft bronze, ruining the oil clearance before the machine even starts.
Always align the oil hole in the bushing perfectly with the feed line in the countershaft box.

Optimize your Raptor crusher’s uptime.
Contact our engineering team today to verify dimensions and stock for your specific FLSmidth model.