CAT 077-3763 100mm Inner Diameter Spherical Roller Bearing

CAT 077-3763 is a Caterpillar genuine single-row deep groove ball bearing (with dust cover), suitable for Cat CB-44B/CB-514/CB-525B road rollers and some small loaders’ hydraulic pump drive shafts or steering knuckle supports. Its core function is to provide low-friction rotary support and bear radial loads, suitable for low-to-medium speed, light-to-medium load conditions. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details Basic Attributes Model 077-3763, Type Single-row Deep Groove Ball Bearing (with stamped dust cover), Suitable for Cat small and medium-sized equipment hydraulic/steering systems, Material: Chromium Steel (GCr15), Inner Diameter φ35 mm (suitable for φ35 mm shaft diameter), Outer Diameter φ72 mm, Width 17 mm, Single Weight Approx. 0.28 kg, Rated Radial Dynamic Load 25.2 kN, Rated Radial Static Load 15.8 kN kN, limiting speed (grease lubrication) 6500 rpm, operating temperature -40℃ to +120℃, sealing class IP54, fit shaft tolerance h6, fit seat tolerance H7

Key Dimensions: Inner diameter tolerance 0/-0.010 mm, outer diameter tolerance +0.012/-0.008 mm, width tolerance ±0.15 mm, rolling element diameter φ8 mm, cage material is stamped steel plate, number of balls 10, ball spacing 12.5 mm, groove curvature radius 4.2 mm, chamfer at both ends 1×45°, coaxiality ≤0.03 mm, radial clearance C3 (0.015-0.025 mm)

Material and Manufacturing Process: The bearing rings and rolling elements are made of GCr15 bearing steel (quenched hardness HRC 60-64, tensile strength ≥1800 MPa), surface ground (Ra≤0.8 μm), and the cage is SPCC. Made of stamped steel plate, the dust cover is made of low-carbon steel with galvanized passivation, with a corrosion resistance rating of ≥96 hours after salt spray test. The lubricating grease is lithium-based composite grease (model Cat DEO-ULS), with a filling amount of 30%-40% of the bearing’s internal space. Compatible with Cat CB-44B/CB-514/CB-525B/CB-534 road rollers (steering knuckle support), 305.5E2 mini excavator hydraulic pump drive end, and 420F2 mini loader (pilot pump bearing seat). Used for low-to-medium speed, light-to-medium load rotary support. Fits bore diameter φ72 mm and shaft diameter φ35 mm. Assembly fit: Interference fit with shaft (0.002-0.008 mm), transition fit with bearing housing (0.005-0.015 mm). After installation, bearing end face runout ≤0.05 mm, no rotational jamming, and axial movement ≤0.1 mm. Installation and Maintenance Points: Before installation, clean the bearing, journal, and bearing housing, checking for rust, deformation, or surface damage. Use a press or specialized tooling for pressing. Do not directly strike the bearing outer ring to prevent damage to the rolling elements or raceways.

After installation, check that the bearing rotates freely without abnormal noise. Run it under no-load for 30 minutes; the bearing temperature rise should be ≤25℃. Check every 1000 hours. Replace immediately if the radial clearance is >0.05 mm or the dust cover is damaged.

Lubrication Maintenance: Under grease lubrication conditions, replenish grease every 2000 hours. In humid/dusty conditions, shorten this to 1000 hours, replenishing 1/3 of the original amount to avoid overheating due to excessive grease.