Oil leakage is a common problem in bulldozer transfer case maintenance. Many leaks ultimately relate to the oil seal, sealing surface, or related mounting components.
The main function of the oil seal is to seal the gap between the rotating shaft and the housing, preventing internal lubricating oil leakage. Although small in size, oil seals operate under demanding conditions, subjecting themselves to rotational friction, temperature changes, and the action of oil, which can cause them to gradually age.
When the oil seal lip wears, hardens, or deforms, its sealing effect decreases. Furthermore, if there are wear grooves on the rotating shaft surface, even replacing the oil seal may not provide a satisfactory seal.
