With clever coatings and solid design, Timken is extending crusher life across Australian mines.
Crushers are the beating heart of any mining operation, working around the clock to break down rock and ore in some of the harshest conditions imaginable.
But with shock loads, vibration and contamination all taking their toll, crusher bearings are often the first components to fail. Timken’s engineering expertise is helping operators change that.
“Crusher bearings face a combination of contamination ingress, like rock dust and water, and high-impact loading that’s inherent to the application,” Timken national mining manager Mark Davies told Australian Mining.
“That leads to indentation and material wear from fine ingress, plus additional stress from high-impact loading. Short bearing life is a common outcome.”
To tackle these issues, Timken has developed a range of engineered-surface (ES) coated spherical roller bearings and solid-housing solutions.
“Our ES coatings cover the rollers with a special layer that extends operating life and can handle poor lubrication,” Davies said. “When you combine ES coatings with Timken’s cast-steel solid block housing, which is twice as strong as cast-iron alternatives, you get a much more resilient unit for impact crushers and similar applications.”
From primary jaw crushers in hard-rock mines to cone crushers in mineral-processing circuits to impact crushers in coal or aggregate plants, each machine subjects its bearings to unique stresses. Timken’s ES-coated bearings and sealed bearing housing assemblies are designed to handle those variables across the full crushing circuit.
Davies said while failure modes don’t differ dramatically between sites, whether it’s a quarry or a gold operation, the combination of heavy impact and contamination remains constant.
“Every site has crushers and they all face the same enemy: dust,” he said. “Keeping that dust and debris out of the bearing is key to long life.”
Timken’s sealed solid-block housings provide multiple layers of protection.
“We use very efficient primary seals, plus secondary covers, purely to keep the lubricant clean inside the bearing,” Davies said. “That cleanliness gives longer life and minimises wear.”
The ES coating also proves its worth when lubrication conditions are less than ideal, a frequent reality on remote mine sites.
“If we’ve identified indentation from hard-particle ingress as a damage mode, applying an ES coating can extend bearing life dramatically,” Davies said. “It’s particularly good for poor-lubrication conditions.”
Proper fit and lubrication are recurring themes in Timken’s guidance for crushing applications. As one of the company’s technical white papers stated, improper fits and poor lubrication are leading causes of premature bearing failure.
“Getting the shaft and housing fits correct is critical,” Davies said. “That’s one of the key areas we can help with; assisting in calculating the right fits for different crushers and vibrating screens.”
Lubrication serves several functions: reducing friction, dissipating heat and ensuring a consistent film between rolling elements.
“[When] using a suitable lubricant, the right type, quantity and replenishment frequency, is really key,” Davies said. “We’ve got calculators and global experience to help operators determine that.
“Poor lubrication is one of the biggest mistakes people make.”
Timken’s white paper also cautioned that over-greasing can be as damaging as under-greasing, causing excess heat and lubricant breakdown.
Mixing incompatible greases can also lead to premature failure. Regular inspection, correct viscosity and adherence to original equipment manufacturer (OEM) schedules all play vital roles in maintaining bearing health.
While crushing applications are front of mind, Timken also has its eye on the screening side of the circuit.
“Vibrating screens and feeders are another key application where we do a lot of work,” Davies said. “They predominantly use spherical roller bearings, but they have to be built to a vibrating spec, with specific tolerances and internal clearances to make sure they operate successfully.”
Brass cages have proven particularly reliable for these applications.
“Other manufacturers sometimes use steel, but we get better results out of the brass cage, so we’ve stuck with that,” Davies said.
Timken’s approach combines advanced materials with field-based engineering support.
“We’re always engaging with operators to identify the real-world failure modes and adapt our solutions,” Davies said. “Every site is different, so it’s about tailoring what we’ve learned globally to what’s happening locally.”
Knowledge is another component of bearing performance. Timken offers training and maintenance programs that focus on correct bearing fitting, sealing and re-lubrication. Its white paper noted that even seasoned technicians benefit from refresher sessions to reinforce best practice and ensure new staff are up to speed.
“Maintenance teams are under pressure to keep production running, but preventive care saves far more in the long run,” Davies said. “If we can help them avoid just one unplanned shutdown, that’s already paid for itself.”
With crushers working at the heart of mining and aggregate production, every hour of uptime counts. Timken’s engineered bearings, coatings and solid-housing systems are proving that careful design and maintenance expertise can make a measurable difference to reliability.
“As the industry pushes for more efficiency and less downtime, our role is to keep machines turning longer and harder,” Davies said.
“The right bearing solution can be the difference between a costly shutdown and smooth, continuous production.”
This feature appeared in the February issue of Australian Mining magazine.