Suspension, wheels and tiresModel years 2004–2013Manufacturer
Grease seen at front hub bearing seals (normal purge, do not replace)
2004-2013 GMC Sierra, Sierra Classic, Yukon and Yukon Denali Models (and Escalade, Avalanche, Silverado, Suburban, Tahoe, Hummer H2)
FaultCrate・Grease seen at front hub bearing seals (normal purge, do not replace)
Grease may move radially outward from the bearing seal area onto adjoining components.
The factory grease fill of the front bearing/hub assembly exceeds what is required for bearing lubrication over the life of the vehicle.
Some grease purges through the self-venting seals in the initial drive period and helps form a barrier against contamination.
What to do
- Replace the bearing only for visible seal damage, endplay over 0.005 in (0.13 mm), rough rotation or abnormal noise.
- If desired, grease that has migrated away from the immediate seal area can be wiped off.
Caution
- Do not replace the bearing for grease purge.
- Do not clean the purged grease from the area on or next to the seals, because it provides additional protection.
In the records
- Bearing: replaced 1
Applies to
- The bulletin covers 2004-2013 GMC Sierra, Sierra Classic, Yukon and Yukon Denali models.
See the evidence (2 documents, 8 passages)
| Document | Publisher | Date |
|---|---|---|
| [1]PIT3078F: Grease Leak From Front Hub Bearings ↗ | ManufacturerGeneral Motors (published by NHTSA) | 2012-10-29 |
| [2]PIT3078F Grease Leak From Front Hub Bearings ↗ | ManufacturerGeneral Motors | — |
Applies toThe bulletin covers 2004-2013 GMC Sierra, Sierra Classic, Yukon and Yukon Denali models.
2004-2013 GMC Sierra, Sierra Classic, Yukon and Yukon Denali Models— [1] Models
Why it happensThe factory grease fill of the front bearing/hub assembly exceeds what is required for bearing lubrication over the life of the vehicle.
The factory grease fill of the front bearing/hub assembly exceeds the amount of grease that is required for adequate bearing lubrication throughout the life of the vehicle.— [1] Condition
Why it happensSome grease purges through the self-venting seals in the initial drive period and helps form a barrier against contamination.
A portion of the grease will purge through the self-venting bearing seals for the initial drive period (a few thousand miles/kilometers) and helps to form an additional barrier to block contamination of the bearing.— [1] Condition
CautionDo not replace the bearing for grease purge.
Do not replace the bearing for grease purge.— [1] Recommendation
CautionDo not clean the purged grease from the area on or next to the seals, because it provides additional protection.
do not clean the purged grease from the area immediately on or adjacent to the seals because this grease provides additional protection.— [1] Recommendation
How to confirmReplace the bearing only for visible seal damage, endplay over 0.005 in (0.13 mm), rough rotation or abnormal noise.
The bearing endplay is greater than 0.005" or 0.13mm— [1] Recommendation
First signsGrease may move radially outward from the bearing seal area onto adjoining components.
In addition, grease may move radially outward from this area onto adjoining components, see example picture below.— [2]
RepairIf desired, grease that has migrated away from the immediate seal area can be wiped off.
If desired, any grease that has migrated away from the immediate seal area can be wiped off.— [2]
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.
List the records (1 that can be opened)
Records whose recall number, document number or text matches. Each line says why it matched.
- Front hub bearing grease leakage preliminary informationManufacturer communication 2017-08-15・document number matches