CAT 575-1973 50.8mm Outer Diameter Flange Sleeve Bearing

CAT 575-1973 is a flanged sleeve bearing used by Caterpillar for transmission/hydraulic systems (the flange end bears axial loads, and the sleeve body bears radial loads). It is suitable for gearbox/pump shafts of mini excavators and loaders. It has an outer diameter of 50.8 mm, is made of steel-backed aluminum-based composite material, has a self-lubricating design, is suitable for medium and low speed light and medium load conditions, and ensures radial positioning and axial limit of the shaft system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 575-1973, flanged single-slot sleeve bearing, material is steel-backed aluminum-based composite (steel back thickness 1.2 mm, aluminum-based alloy layer thickness 0.8 mm, contains solid lubricant, self-lubricating), operating temperature -40℃ to +120℃, single weight approximately 0.12 kg, suitable speed ≤1800 rpm, withstands radial load + unidirectional axial load (flange end), no maintenance cycle, service life ≥8000 hours (normal operating conditions)

Key Dimensions
Inner diameter 30 mm (tolerance 0/-0.015 mm), outer diameter 50.8 mm (tolerance +0.025/0 mm), cylinder length 45 mm (tolerance 0/-0.12 mm), flange diameter 65 mm (tolerance +0.030/0 mm), flange thickness 5 mm (tolerance 0/-0.08 mm) (mm), fit tolerances: journal k6 (+0.012/+0.002 mm), bearing housing J7 (+0.015/-0.010 mm), radial clearance 0.020-0.040 mm, end face runout ≤0.02 mm. Compatible models: Cat 305.5E2 excavator (swing motor output shaft), 906M loader (gearbox input shaft), C7.1 engine (auxiliary drive shaft), 353E skid steer loader (hydraulic pump drive shaft). Uses 237-4360 sleeves and 1J-0581 bearing caps. Rated load: Radial rated dynamic load Cr=28 kN, radial rated static load Cor=42 kN, axial rated dynamic load Ca=15 kN, axial rated static load Coa=22 kN, limiting speed (self-lubricating) 1800 rpm, (oil lubricating) 2500 rpm, impact load ≥12. Installation and Maintenance Points (kN): Before installation, clean the inner and outer surfaces of the bearing, the journal, and the bearing housing bore. Check for cracks, rust, and deformation. Measure dimensions and fit tolerances. Apply Cat-specific assembly oil to the bearing housing bore. Use cold pressing for installation; do not strike the flange face to avoid damaging the aluminum alloy layer.

Use a special press to apply even pressure and press the bearing into the bearing housing, ensuring the flange end face fits snugly against the bearing housing positioning surface and that the cylinder and journal fit securely. After installation, manually rotate the shaft to ensure there is no jamming or abnormal noise, and the axial clearance is ≤0.05 mm.

Maintenance and Replacement: Check bearing wear and temperature every 2000 hours. If the outer diameter wear is >0.1 mm or the flange face shows deformation or cracks, replace immediately. It is recommended to replace the bearing simultaneously with the sleeve and bearing cap to ensure effective shaft positioning.