Contaminated Gear Oil
- Contaminated gear oil As the face seal becomes weaker, jobsite debris can begin to find its way, including sand, grit, and dirt. You can imagine the damage these abrasive contaminants can cause. It’s not uncommon for us to open up a final drive core and find that instead of gear oil that planetary hub is filled with a useless sludge made up of gear oil mixed with all kinds of debris. This is very, very bad for your final transmission.