Generally, the wheel bearings will require infrequent service; however, they should be checked whenever the wheels are raised for any reason. With the vehicle securely supported on jackstands, spin each wheel and check for noise, rolling resistance, or free play. Grasp the top of the tire with one hand and the bottom with the other, then rock the tire on the spindle. If the wheel moves, indicating side play, the bearings should be removed, inspected, and replaced if necessary. Remove each wheel and tire, and inspect the area around the bearings for grease leaking past the wheel bearing seals, which must be replaced if any leakage is apparent.