CAT 474-9671 Sleeve Bearing (Bushing)

CAT 474-9671 is a Caterpillar drivetrain-specific bearing sleeve, suitable for core components such as the C18 engine camshaft, the 349D2 excavator swing gearbox, and the 992K loader gearbox. It is used to support rotating shafts, reduce friction, and withstand radial loads. It is often used in conjunction with the 1J-0581 bearing cap and the 474-9675 O-ring to ensure the stable operation of the drivetrain (Cat® Parts). The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 474-9671, Bearing Sleeve (Shaft Sleeve / Sliding Bearing), material is steel-backed bronze (steel back Q235 + bronze layer ZCuSn10Pb1, bronze layer thickness 0.5-0.8 mm, hardness HB80-100, tensile strength ≥200 MPa, wear resistance, good thermal conductivity), operating temperature -40℃ to +150℃, single weight approximately 1.0 kg, suitable for medium speed (≤1800 rpm), medium load (≤22 MPa) conditions, used to support rotating shafts, reduce friction, bear radial loads, and prevent shaft vibration and wear.

Key Dimensions
Inner diameter 95 mm (tolerance 0/-0.020 mm), outer diameter 115 mm (tolerance +0.025/0 mm), total length 55 mm, wall thickness 10 mm, inner hole surface roughness Ra≤0.4 μm, with tolerances of inner ring h6 (0/-0.020 mm) and outer ring H7 (+0.035/0 mm), chamfer 15°×1.5 mm, coaxiality ≤0.02 mm, cylindricity ≤0.015 mm. Compatible with Cat C18 engines (camshaft bearing housing sleeve), 349D2 excavators (slewing gearbox input shaft bearing), 992K loaders (gearbox output shaft bearing), and D11T bulldozers (final drive input shaft bearing). Uses 1J-0581 bearing caps and 474-9675 O-rings (inner diameter 95 mm, wire diameter 4.5 mm).

Assembly fit: inner bore and shaft transition fit (clearance 0.010-0.018 mm), outer ring and bearing housing interference fit (interference 0.012-0.020 mm). Journal surface requires hardening (hardness HRC58-62, roughness…). (Ra≤0.2 μm), bearing housing bore precision bored (Ra≤1.6 μm), radial runout ≤0.02 mm after installation. Installation and Maintenance Points: Before installation, clean the inner and outer surfaces of the bearing, journal, and bearing housing bore. Check for scratches, porosity, and bronze layer peeling. Measure dimensions and fit tolerances to ensure compliance. Apply Cat-specific assembly oil to the bearing housing bore for easy cold-press installation.

Use a special press to apply even pressure during installation. Do not strike the end face to prevent damage to the bronze layer. After installation, manually rotate the shaft to ensure no jamming and radial clearance of 0.010-0.018 mm.

Maintenance and Replacement: Check bearing wear every 1000 hours. If inner bore wear exceeds 0.15 mm or the bronze layer cracks or peels, replace immediately. It is recommended to replace the bearing simultaneously with the bearing cap and O-ring to ensure support and sealing performance.