CAT 5J-2991 RETAINER

CAT 5J-2991 is a Caterpillar genuine axle retaining ring (external retaining ring) used to secure rotating components such as bearings, gears, and sprockets, preventing axial movement. It is suitable for wheel loaders, excavators, gearboxes, drive axles, and engine accessories. The following is precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 5J-2991 (5J2991) Axle retaining ring, weight approximately 0.03 kg (0.066 lb), suitable for shaft diameter positioning and anti-axial movement applications.

Core Material: 65Mn spring steel, quenched and tempered, surface galvanized and passivated, hardness HRC 42-48, excellent elasticity and toughness, corrosion resistant, suitable for harsh working conditions in construction machinery.

Key Dimensions: Inner diameter 75 mm (2.953 in), outer diameter 85 mm (3.346 in), thickness 2 mm (0.079 in), suitable for shaft groove diameter 75 mm, groove width 2.1 mm. mm (Tolerance + 0.1/-0.05 mm)

Structural Features: Single-ring, earless, open-end elastic structure; smooth, burr-free outer ring; uniform opening gap; after installation, it relies on elastic tension to clamp the shaft groove; suitable for radial positioning and axial anti-movement; suitable for positioning the bearing outer ring and gear end face.

Compatible Models: CAT 950G/966G loaders (gearbox second shaft bearing positioning), 320C excavators (travel drive axle wheel hub bearing fixing), C13 engines (water pump pulley positioning), etc.

Accessories: Suitable for shaft diameter 75 mm (tolerance h6), bearings 533-8246, gears 9J-3456, shaft retaining ring installation clamps 8T-0912

Core Functions and Installation Points:

Axial Positioning and Anti-Movement: Spring steel elastic structure; after installation in the shaft groove, it generates radial tension, firmly clamping the groove wall and preventing axial movement of bearings, gears, and other components, ensuring stable operation of the transmission system.

Easy and efficient installation: The earless design allows for easy insertion into the shaft groove using dedicated retaining ring pliers. It automatically locks in place upon release, requiring no additional fasteners, making it suitable for rapid assembly and maintenance.

Installation Specifications:
Clean the shaft groove, ensuring it is free of burrs and oil. The groove width should match the retaining ring thickness (groove width 2.1 mm ±0.05 mm), and the groove bottom roughness Ra ≤ 1.6 μm.

Use retaining ring pliers to open the retaining ring, align it with the shaft groove, and insert it, ensuring the retaining ring is fully embedded and fits snugly against the part’s end face without looseness or misalignment.

After installation, check the retaining ring opening gap to ensure normal elastic tension and no plastic deformation, preventing it from falling off during operation.

Maintenance Recommendations:
Use dedicated tools for disassembly to avoid prying, which could deform or break the retaining ring and affect its reusability.

Regularly inspect the retaining ring’s appearance. If rust, cracks, or loss of elasticity are found, replace it with an original part immediately to ensure reliable positioning.