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Wheel bearings

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Wheel bearings

  1. 1. WHEEL BEARING DESIGN, DIAGNOSIS, & REPAIR
  2. 2. Allow the wheel to turn freely around the spindle, in the steering knuckle, or in the bearing support Most wheel bearings are tapered roller bearings or ball bearing Accurately hold disc or drum in true to minimize brake pulsation
  3. 3. TAPERED ROLLER BEARING Lubricated with high-temperature grease
  4. 4. BALL BEARING Balls allow parts to rotate with a minimum amount of friction and wear
  5. 5. HUB AND WHEEL BEARING (NON-DRIVING WHEELS) Spindle is stationary, providing a mounting place for the wheel bearings, hub, and wheel Hub is partially filled with grease to lubricate the bearings Nut on the end of the spindle allows adjustment of the bearing preload
  6. 6. HUB AND WHEEL BEARING (NON-DRIVING WHEELS)
  7. 7. HUB AND WHEEL BEARING (NON-DRIVING WHEELS) Used on the front of rear-wheel-drive cars or the rear of front-wheel-drive cars
  8. 8. HUB AND WHEEL BEARING (DRIVING WHEELS) Axle shaft rotates inside a stationary support Drive shaft fits through the center of the bearings Hub is splined to the axle shaft Ball bearings are lubricated by thick, high- temperature grease
  9. 9. HUB AND WHEEL BEARING (DRIVING WHEELS)
  10. 10. HUB AND WHEEL BEARING (DRIVING WHEELS) Commonly used on the front of front-wheel-drive vehicles
  11. 11. HUB AND WHEEL BEARING (FOUR-WHEEL DRIVE) Front drive axle extends through a stationary spindle Special free-wheel, or locking hub transfers power from the axle to the hub-disc assembly when in four- wheel-drive
  12. 12. HUB AND WHEEL BEARING (FOUR-WHEEL DRIVE) Front axle, brakes, hub, and wheel bearing assembly
  13. 13. WHEEL BEARING NOISE Produced by a dry, worn wheel bearing When balls or rollers are damaged from lack of lubrication, they may emit a humming or growling sound Checking the bearings:  raise the vehicle on a lift  rotate the tire by hand  feel and listen for bearing roughness  wiggle the tire to check for looseness
  14. 14. Wheel bearings are normally filled with grease If the grease dries out, the bearing will fail Some bearings are serviceable Some bearings are sealed units
  15. 15. Questions? Questions? Bueller…

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