CAT 077-4988 SLINGER OIL

CAT 077-4988 is a genuine Caterpillar oil slinger ring (pure original factory information, no additional description). It is an oil-slinging seal for rotating parts of construction machinery. It uses centrifugal force to prevent lubricating oil from entering non-lubricated areas, fitting into shaft systems and bearing cavities to prevent oil leakage and assist in lubrication distribution.

Core Parameters and Information

Item Details
Part Model: CAT 077-4988 (0774988) Oil Slinger

Structure Type: Annular disc shape, outer ring with arc-shaped oil slinger fins, inner ring interference fit with shaft, no additional seals, relies on centrifugal force for oil slinging

Material: Low carbon alloy steel (S235JR), galvanized and passivated for corrosion protection, deburred edges of the oil slinger fins

Key Dimensions: Inner diameter 60 mm, outer diameter 90 mm, thickness 5 mm, oil slinger fin width 8 mm, inner ring fits shaft diameter tolerance H7/k6

Performance Parameters: Applicable speed ≤3000 r/min, operating temperature -20℃ to 150℃, centrifugal oil slinging efficiency ≥95%, compatible with mineral oil/synthetic oil

Compatibility Standard: Complies with CAT shaft accessory technical specifications, geometric tolerance GB/T 1184 – K grade, surface roughness Ra≤1.6 μm Compatible Models and Assemblies

Compatible Parts: Matches CAT 077-4840 BLO bearings and 077-4836 retainers. Installed on rotating shafts such as gearbox output shafts, hydraulic pump input shafts, and travel wheel axles, located on the outside of the bearing or inside the bearing cavity.

Compatible Equipment: CAT 326D2/336D2 excavators, 980M loaders, D7E bulldozers, etc. Used to isolate the bearing cavity from the outside, preventing lubricating oil leakage along the shaft to brake/sealing components.

Installation: 1 piece per shaft. The inner ring has an interference fit with the shaft, and the outer ring has a clearance of 0.5-1.0 mm with the housing. Installed on the outside of the bearing end face, no additional fasteners required.

Installation and Maintenance Points: Clean the shaft and mounting position. Inspect the oil slinger ring for deformation, cracks, and corrosion, and check the oil slinger blades for damage.

Use specialized tools for cold pressing installation, applying even pressure to the inner ring end face. Do not strike the outer ring or fins. Ensure perpendicularity to the shaft.

After installation, check for radial runout ≤0.1 mm and axial runout ≤0.05 mm. Ensure there are no abnormal noises or contact with the housing during operation.

Maintenance: Inspect the appearance and fit every 2000 hours. Replace fins if deformation/rust/wear exceeds 0.5 mm to prevent oil leakage due to oil slippage failure.