How to Select the Right Bearing for Forestry Applications

1. Start with Environmental Exposure

Fine wood dust, bark, sap, moisture, ash, and heat are some key players in contaminating your equipment and can easily overwhelm standard seals and lead to premature bearing failure.

When evaluating bearings for forestry use, consider:

• Is the application exposed to wood fiber, pitch, or pine sap?
• Is there constant airborne dust or ash, such as around boilers or fans?
• Will the bearing see washdown, rain, or high humidity?

In these conditions, seal design is often the biggest driver of overall bearing life. Bearings that offer intentional sealing designs, such as labyrinth seals, contact seals, and end or auxiliary caps, allow maintenance teams to tailor protection to the application without replacing the entire unit.

2. Account for Shock Loads and Misalignment

Logs are neither consistent nor forgiving in their physicality. Because of this, forestry equipment experiences frequent impact from uneven material, sudden starts and stops, and occasional jams. These forces can easily – and quicky – accelerate the wear on bearings that are not designed to tolerate shock and misalignment.

Spherical roller bearings are often preferred in forestry applications because they:

• Handle high radial loads
• Tolerate shaft deflection and misalignment
• Perform reliably under shock loading

And while many modern spherical roller bearings account for misalignment, the Rex Spherical Roller Bearings allow for an increased 2 degrees of static misalignment, helping protect both the bearing and the shaft when conditions are less than ideal.

3. Consider Lubrication and Maintenance Accessibility

Bearings can often operate in locations that are difficult or unsafe to reach frequently – especially in forestry applications. Designs that improve grease retention, allow grease purging, or reduce relubrication frequency can have a major impact on maintenance efficiency.

Look for features such as:

• Increased internal grease capacity
• Direct lubrication paths
• Seals that allow contamination to be purged without forcing debris into the bearing

By selecting bearings that align with realistic maintenance schedules rather than ideal ones helps reduce unexpected failures and can significantly reduce unplanned downtime.

4. Understand Housing Design and Installation Realities

Another key aspect of intentional bearing selection is considering the housing design – especially in harsher settings. Maintenance environments are not clean assembly benches, and installation procedures that require precise measurements can introduce risk.

For example, traditional split‑housed SAF‑style bearings often require:

• On‑site assembly
• Manual clearance setting using feeler gauges
• Incremental tightening that is highly dependent on installer experience

In dusty, high‑heat environments, these steps increase the likelihood of contamination and improper mounting.

This is where solid-housed, shaft-ready bearings, such as the Rex™ ZAF style bearings with preset internal clearances can significantly reduce installation time and eliminate clearance uncertainty, especially in the field. In some forestry applications, this has reduced installation time from hours to minutes while improving bearing life.

5. Choose the Right Shaft Locking Method

Shaft locking methods are a critical – but often overlooked – factor in bearing reliability, especially within these more demanding environments. While traditional set screw locking is still commonly used, it relies on ideal conditions and can loosen over time due to frequent shock and vibration, increasing the risk of damage and bearing creep. For these reasons, many forestry operations favor more robust locking options.

More advanced locking systems offer key advantages in these conditions like:

• More uniform shaft grip to better resist vibration and impact
• Reduced risk of shaft fretting, wear, and bearing creep
• Improved mounting integrity over longer run times
• Easier installation and removal with less risk of shaft damage

Eccentric and tapered locking systems help distribute clamping force more evenly than set screws, making them a good fit for these types of operations with more even clamping which helps reduce shaft damage, shock load, and vibration to the system. Bearings such as Rex™ SHURLOK™ mounted spherical roller bearings pair the tapered adapter locking method with preset clearances, helping to simplify installation while improving the long-term reliability of these parts. With both eccentric and tapered locking options available across our mounted bearing portfolio, Regal Rexnord solutions aim to reduce maintenance demands and improve uptime within these forestry environments.

6. Prioritizing Everything Together: A Forestry Case Example

A forestry operation experienced frequent bearing failures on lathe tray rolls due to pine tar ingress and contamination buildup on the locking mechanism. Competing bearings failed approximately every two weeks, leading to excessive downtime and replacement costs.

By switching to a Sealmaster Next Generation Skwezloc™ concentric lock bearing solution featuring:

• A felt labyrinth seal with rotating flinger
• A concentric locking system designed to improve shaft grip
• Improved grease retention and contamination exclusion

The operation extended bearing life by more than eight months and counting, saving over $900,000 annually in bearing replacement and maintenance costs.

Selecting Bearings as a Reliability Strategy

Bearing selection is not just a component decision – especially in forestry applications – it is a reliability strategy. Bearings must be able to withstand contamination, tolerate routine abuse, install easily in harsh environments, and continue performing with minimal intervention.

By focusing on:

• Environmental sealing
• Shock load capability
• Shaft locking method
• Installation simplicity
• Long‑term maintenance realities

forestry operations can dramatically improve uptime, reduce total cost of ownership, and limit unplanned shutdowns.

Explore Forestry‑Ready Bearing Solutions

Regal Rexnord™ offers a wide range of Rex™, Sealmaster™, Link‑Belt™, and Rollway™ bearing solutions designed specifically for forestry and wood‑processing environments. Explore our bearings offering here