Track rollers on tracked construction machinery such as bulldozers and excavators often experience oil leakage due to heavy loads and harsh operating conditions. Once oil leaks occur, they accelerate wear and may even lead to premature failure. The vast majority of oil leaks originate from the floating seals. Here are some primary reasons for this issue:
1. O-ring Twisting after Installation
When the track roller is static, a seal inspection reveals that the O-ring fits tightly against the housing cavity, and the floating seal does not leak. However, when the excavator is moving, this causes the O-ring to twist, resulting in oil seepage between the O-ring and the housing cavity, as well as between the O-ring and the floating seal ring.
2. Insufficient Radial Pressure on the O-ring
Due to insufficient radial pressure on the O-ring within the housing cavity, the resulting circumferential friction force is reduced. This causes the O-ring to rotate relative to the housing cavity, leading to oil seepage between the O-ring and the cavity.
3. Excessive Sealing Surface Pressure on the Floating Seal Ring
If the sealing surface pressure on the floating seal ring is too high, the two floating seal rings stick together (commonly known as "seizing") when the roller body rotates. This causes relative rotation between the seal ring and the O-ring, resulting in oil seepage at the interface between the O-ring and the floating seal ring.
___RedShine Machinery
01/17/2026