Polaris Tech Tip: How to Inspect Polaris Wheel Bearings and Hub Play

Tech Tip: How to Inspect Polaris Wheel Bearings and Hub Play

Your Polaris wheel bearings are double-row ball bearings designed to take massive side-loads and impacts. However, they are also a "wear item." Because UTVs and ATVs are frequently driven through water and silt, the internal seals can fail, allowing grit to grind down the hardened steel races. A failed bearing doesn't just make noise—it can cause the brake rotor to wobble, leading to a "soft" brake pedal and eventual hub damage.

Step 1: The "12 and 6" Shake Test

To accurately test a wheel bearing, you must take the weight of the machine off the suspension. Use a jack to lift the wheel off the ground.

• The Grip: Place one hand at the very top of the tire (12 o'clock) and the other at the very bottom (6 o'clock).
• The Movement: Attempt to rock the tire in and out with a firm, rapid motion.
• The Result: You should feel zero "play." If you feel a metallic "thunk" or see the wheel hub moving independently of the steering knuckle, the Genuine Polaris OEM Wheel Bearing has reached the end of its life.

Step 2: Checking for "Growl" and Roughness

Sometimes a bearing is tight (no play) but has "pitted" internal races that cause vibration and heat.

• The Spin: Spin the wheel as fast as you can by hand. Listen closely to the center of the hub.
• The Sound: A healthy bearing is nearly silent. If you hear a "growling," "grinding," or "whirring" sound, the grease has been contaminated, and the bearing is failing.
• The Feel: Place your hand on the upper A-arm or steering knuckle while the wheel is spinning. if you feel a "crunchy" vibration through the suspension, the bearing is shot.

Step 3: Inspecting the Hub Nut and Cotter Pin

The wheel bearing is held together by the torque of the large center castle nut on the axle. If this nut is loose, it will mimic a bad wheel bearing.

• The Cotter Pin: Ensure the cotter pin is present and not sheared off. If it's missing, the nut can back off, leading to instant bearing failure.
• The Washer: Look for the "coned" spring washer behind the nut. If this washer is installed backward or is flattened out, the bearing will not stay pre-loaded.

Pro Tip: The Bearing Greaser Tool

Most Polaris wheel bearings come "sealed" from the factory, but they often contain very little grease. Many riders use a "wheel bearing greaser" tool that slides into the bearing without removing the axle. Pumping in a high-quality waterproof grease every season can triple the life of your bearings by pushing out any water that managed to sneak past the seals during your last wash or creek crossing.

Restore your smooth ride and steering precision. Shop Witchdoctors.com for OEM Polaris wheel bearings, replacement hubs, and axle hardware today!

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