PTC News March 2016

Tuesday, March 8, 2016

Tips for Preventing Premature Wheel Bearing Failure

To maximize safety and reliability, PTC recommends
inspecting the wheel bearings during any brake service
work, regardless of the vehicle’s age.

KEY INSPECTION TIPS

Always make sure the work area is as clean as possible.
Even tiny particles of dirt or grit can enter a bearing
damaging it internally and shortening its operating life.

1. Check for early warning signs of a
worn bearing which may include
friction noise on wheel rotation, or
an unusually slow turning wheel
when suspended on a rack.

2. For rear-wheel drive vehicles,
most manufacturers recommend
lubrication at the front wheel
bearings at 24,000 miles.

3. PTC recommends replacing the
bearings or hubs on both wheels at
the same time. Both wheels have the
same mileage and are subjected to
the same wear and tear.

4. Use the right tools and follow the
proper mounting instructions in the
manufacturer’s workshop manuals.

5. Always treat bearings with care.
Although bearings appear very
durable, they are sensitive enough,
that even slight mishandling can
damage a bearing’s inner geometry.

6. Always choose the correct grease.

7. Check the contact surface for the
seal lip. Even the smallest mark or
rust will damage the seal lip and
allow water penetration and
eventual corrosion.

8. Never use a hammer to hit
directly on the bearing.

9. Torque the bearing
nut to the correct
OE specified preload.

Note: Do not try to set clearances on hub units. They are preset at the factory with the correct preload torque setting.

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