In mining equipment selection and spare parts procurement, focus is often placed on brands, models, and prices. However, a critical factor is frequently overlooked: material adaptability under extreme working conditions. This article shares a typical case of a jaw crusher eccentric shaft fracture that occurred at a large open-pit coal mine in Kazakhstan, where the root cause was a material selection error for low-temperature environments.

Kazakhstan is one of the world's major coal-producing regions, with some mining areas located in alpine zones where winter temperatures can drop to around -50°C.

Under such conditions, equipment must not only withstand high impact and heavy loads but also face the risk of material embrittlement caused by prolonged exposure to severe cold.

The client site utilized C160 large-scale jaw crushers, primarily used for crushing high-hardness ore.

One of the core transmission components of this equipment is the jaw crusher eccentric shaft—it directly determines the "heartbeat" and lifespan of the entire machine.

Key characteristics of the eccentric shaft include:

• Great length and large diameter, with significant self-weight.
  
  
• Subject to alternating bending, torsion, and impact loads.
  
  
• Once damaged, the replacement cycle is long, costs are high, and downtime losses are immense.

Therefore, matching the material of the jaw crusher eccentric shaft to the specific working conditions is paramount.

The incident occurred during winter transport.

Following a crusher overhaul, a new jaw crusher eccentric shaft was transported to the Kazakhstan mine site during winter.

The transit environment was consistently frigid, with external temperatures nearing -40°C to -50°C.

Upon arrival, as technicians prepared for installation, they discovered the shaft had suffered a severe fracture during transport:

Since the jaw crusher eccentric shaft is a critical large-scale component, the emergency re-procurement cycle was lengthy. This resulted in extended production halts and reduced output, leading to high economic losses and disrupting the client's production plans.

While a 45# steel jaw crusher eccentric shaft can generally operate safely at room temperature or in typical winters (-10°C to -20°C), selecting materials based solely on "standard experience" for the -50°C extremes of a Kazakhstan mine created a serious hidden safety hazard.

The C160 jaw crusher eccentric shaft fracture in Kazakhstan might look like a single broken part, but it serves as a stern reminder of the dangers of ignoring extreme conditions in material selection.

Material that is "good enough" in moderate climates can become a major risk at -50°C. For high-value components critical to the entire production line, a reasonable material upgrade is often much cheaper than the loss incurred by a single production halt.

Sometimes, a proactive "material health check" can save you from a costly lesson.

If you are facing low-temperature brittle fractures or rapid wear of crusher parts, PAJOA is an expert with project supply experience. We provide comprehensive wear-resistant material consultation and customized processing, offering high-performance crusher parts solutions to ensure your equipment runs steadily even in the dead of winter.