Adjusting Heavy Duty Wheel Bearings

Adjusting heavy duty wheel bearings using a two nut system.

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As you can figure out from their name, preset bearings don’t require any setting or adjusting. The adjustment is designed and built in. If you’re not using a preset bearing, you have to adjust the bearings to create the right clearance between the inner and outer races.

In this video, you’ll see how to adjust the bearing using a two nut system. During this video, pay special attention to all warnings and cautions to help protect yourself, fellow maintenance professionals, customers, and your equipment. We’ll show the process described in the recommended practice RP 618 of the American Trucking Association’s technology and maintenance counsel. Also check the manufacturer’s instructions, which may include safety information and warnings.

With a manually adjusted bearing, there is no spacer. Torque the inner adjusting nut to 200 foot pounds while rotating the hub assembly. Back off the inner nut one full turn. Re-torque the adjusting nut to 50 foot pounds while rotating the hub assembly. Back off the inner nut according to the instructions in RP 618. Install the lock washer, engaging the slot in the spindle and dowel pin on the adjusting nut. If you can’t engage the locking system, try removing, flipping, and re-installing the locking device. If that doesn’t work, loosen the nut slightly until you can engage the locking system. Install the jam nut and torque it based on the table in RP 618.

For a one piece, manually adjusted system, use the nut manufacturer’s installation instructions.

I’m Rick Domman. This has been a Timken Tricks of the Trade video helping you build your service knowledge. Thanks for watching.