CAT 077-7093 RETAINER

CAT 077-7093 is a Caterpillar genuine shaft retainer (pure original factory information, no additional description), used for shaft positioning in hydraulic/transmission systems, suitable for heavy-duty vibration conditions, and often used with bearings, bushings, and other components to limit axial movement.

Core Parameters and Information

Item Details
Part Model: CAT 077-7093 (0777093) Circlip

Structure Type: Shaft-mounted elastic retaining ring, open type, with mounting groove, blackened surface for corrosion protection

Material: 65Mn spring steel, quenching hardness HRC 42-48, blackened surface, salt spray test ≥48 h, thickness tolerance ±0.02 mm

Key Dimensions: Inner diameter 140 mm, outer diameter 155 mm, thickness 3 mm, opening width 8 mm, mounting groove diameter 145 mm, groove width 3.2 mm, chamfer 1×45°

Performance Parameters: Axial load ≥22 kN, radial runout ≤0.05 mm, flatness ≤0.03 mm, axial movement after assembly ≤0.05 mm

Compatibility Standard: Complies with CAT retaining ring specifications, dimensional tolerance GB/T 894.1 – 7 grade, surface roughness Ra≤1.6 μm, hardness conforms to SAE J403. Fitting relationship: Embedded in the mounting groove on the shaft, positioning the bearing inner ring and preventing axial movement. It mates with the corresponding retaining ring to form bidirectional axial positioning.

Compatible models and application scenarios:

Compatible parts: Matches corresponding tapered roller bearings, bushings, etc., used in gearbox output shafts, drive axle differential shafts, hydraulic pump drive shafts, etc., to position the bearing inner ring and limit axial displacement.

Compatible equipment: CAT 349D2/352 excavators, 988K loaders, D8T bulldozers, 777 mining trucks, etc., suitable for heavy-load vibration conditions in transmission systems.

Installation: One piece per bearing, embedded in the shaft groove, fitting against the end face of the bearing inner ring, relying on elastic fixation, no bolts required.

Installation and maintenance points: Clean the retainer and shaft groove, check for deformation, cracks, and corrosion. Measure the inner diameter, thickness, and shaft groove dimensions to ensure tolerance matching.

Use special snap ring pliers to pry open the opening, insert it into the mounting slot on the shaft, and release it. It will automatically spring back and lock in place. Check that there is no gap between the snap ring and the inner ring of the bearing.

After installation, rotate the bearing. It should rotate freely without jamming. Axial runout should be ≤0.05 mm, radial runout ≤0.08 mm, and there should be no abnormal noise.

Maintenance: Check elasticity and wear every 1000 hours. Replace the bearing if it shows deformation, corrosion, or wear >0.1 mm. Use special tools for disassembly; do not pry it open forcefully to avoid breakage.