CAT 077-8682 HSG BRG RETA

CAT 077-8682 is a Caterpillar genuine bearing retainer housing (pure original factory information, no additional description). It is the mounting base and protective shell for the bearing retainer, used to fix the retainer and seal the bearing cavity. It is suitable for small and medium-sized power and transmission components, rigidly installed by bolts, and suitable for low to medium speed and medium load conditions Cat®…

Core Parameters and Information

Project Details
Part Model: CAT 077-8682 (0778682) Bearing Retainer Housing

Structure Type: Cup-shaped housing with flange and 3 evenly distributed bolt holes, inner groove for retainer ring, central through hole for shaft passage, bottom with sealing groove

Material: QT450-10 ductile iron, electrophoretic paint finish; sealing groove fitted with nitrile rubber (NBR) O-rings

Key Dimensions: Housing outer diameter 78 mm, center hole diameter 32 mm, flange thickness 8 mm, 3 bolt holes (evenly distributed, 62 mm diameter), bolt size M10×1.5, groove width 3 mm, total height 25 mm, O-ring groove diameter 45 mm × cross-section 2.4 mm

Performance Parameters: Rated working pressure 0.8 MPa, bolt preload torque 32-38 N・m, temperature resistance -30℃ to + 120℃, IP65 sealing rating, salt spray test ≥120 h
Compatibility Standards: Complies with CAT MES J5103 housing specifications, compatible with ISO 898-1 bolt connection standards, and the slot is compatible with CAT 077-8625 bearing retainer rings.
Accessories: Includes 3 M10×1.5 bolts and 1 NBR O-ring, compatible with CAT 077-8627 BE retainer.
Compatible Models and Applications:
Compatible Equipment: CAT 307/308 mini excavators, 226B/236B skid steer loaders, 3054/3056 engines, hydraulic pump/motor end covers, gearbox output shaft ends, etc.
Applications: Positioning and protection of bearing retainer rings, sealing bearing cavities to prevent oil leakage and dust ingress, commonly used in fan drive shafts, water pump shafts, generator bearing ends, etc.

Installation: The housing is installed on the outside of the bearing housing, the retaining ring is embedded in the inner groove, and the bolts are tightened. The O-ring provides a static seal and, in conjunction with the retainer, restricts the axial movement of the bearing.

Installation and Maintenance Points: Clean the housing, mounting surface, and bolts. Inspect the housing for cracks and deformation, ensure the groove size matches the retaining ring, the O-ring is undamaged, and the bolt threads are intact.

Insert the O-ring: Embed the retaining ring into the housing groove, align it with the mounting surface, insert the bolts, and tighten evenly to 32-38 N·m in 2-3 stages.

Post-Installation Inspection: The housing should fit tightly against the mounting surface without looseness, rotating parts should not interfere, there should be no leakage at the seal, and the retaining ring should not be at risk of falling off.

Maintenance: Every 1000 hours, check the bolt tightness, O-ring aging, and housing deformation. Replace the O-ring promptly if it is aged or the housing is deformed to prevent seal failure.