Description
CAT 5S-4557 14.3mm ID Turbocharger Cartridge Bearing
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The CAT 5S-4557 is a floating journal bearing (14.3 mm inner diameter) adapted for turbocharger cores. Its core function is to support the high-speed rotation of the turbine shaft and withstand pure radial loads. It is suitable for Cat medium and heavy-duty engine turbochargers and features high temperature resistance, low friction, and high oil film stability. It is a key component to ensure the efficient and low-consumption operation of the turbocharger and to suppress vibration and wear. It is suitable for continuous high temperature (≤260℃) and high speed (≤150000 r/min) operating conditions. The following is structured technical and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 5S-4557, Type: Floating journal bearing (bimetallic layer, floating inner ring), Material: Steel back + Babbitt metal (tin-antimony-copper alloy, thickness 0.3-0.5 mm, hardness HB 25-35), Steel back is low carbon alloy steel (thickness 2.5 mm, quenching hardness HRC 30-35), Single weight approximately 0.08 kg, Operating temperature: -40℃ to +260℃, Lubrication method: Forced oil lubrication (recommended Cat DEO-ULS 15W-40 diesel engine oil), Design life ≥8000 hours (normal operating conditions)
Key Dimensions
Inner diameter: 14.3 mm (tolerance 0/+0.005 mm), Outer diameter: 22.2 mm (tolerance 0/-0.008 mm), Total width: 18.5 mm (tolerance 0/-0.1 mm) Babbitt layer thickness 0.4 mm (uniformity error ≤ 0.02 mm), radial clearance 0.05-0.07 mm (cold state), mounting chamfer r1=1 mm, floating clearance fit (journal and inner diameter clearance 0.04-0.06 mm)
Compatible Engines and Parts: Compatible with Cat C13, C15, and C18 engines (turbocharger models such as Garrett GT42 and Holset HX55), with 5S-4558 thrust washer, 103-8329 elastic retaining ring, 4T-0512 oil seal, and 5P-0960 extreme pressure lithium-based grease (auxiliary seal). Compatible with turbocharger core assemblies with a turbine shaft diameter of 14.3 mm.
Performance Parameters: Basic rated dynamic load 18 kN, basic rated static load 32 kN, limiting speed (oil lubrication) 150,000 r/min, allowable radial load ≥ 12 kN, coefficient of friction ≤0.0015, impact load ≥5 kN, recommended oil pressure 0.3-0.5 MPa (idle speed), 0.8-1.2 MPa (rated speed)
Structural and Performance Advantages:
Floating journal design allows the bearing to float slightly with the turbine shaft, automatically compensating for coaxiality errors, reducing friction and wear, suitable for high-speed turbocharger operation. The bimetallic layer (steel backing + Babbitt alloy) balances strength and friction reduction. Babbitt alloy has good embedding and conformability, absorbing impurities and protecting the turbine shaft and bearing surfaces.
Forced oil lubrication design allows lubricating oil to enter from the bearing end face, forming a complete oil film that carries away heat and impurities, preventing bearing overheating and wear. Suitable for the continuous high-temperature, high-speed operating environment of turbochargers, extending service life.
The low-carbon alloy steel backing provides sufficient support strength, and the Babbitt alloy layer has good thermal conductivity, quickly dissipating heat and avoiding bearing failure caused by localized overheating. Suitable for frequent start-stop and large load fluctuation conditions.
Installation and Maintenance Points:
**Before installation:** Clean the bearing, turbine shaft, and bearing housing. Check for rust, burrs, or peeling Babbitt alloy layer. Measure the journal diameter (14.3 mm) and bearing inner diameter to ensure the clearance meets requirements. Use specialized tooling for press-fitting. Do not strike the bearing to prevent damage to the Babbitt alloy layer.
After installation: Rotate the turbine shaft to check for any jamming or abnormal noise. Ensure the bearing floats freely. Install thrust washers and elastic retaining rings. Adjust the axial clearance to 0.1-0.2 mm. Connect the oil lines to ensure unobstructed forced lubrication without leaks.
Maintenance: Check the oil pressure, temperature, and cleanliness every 500 hours. If the oil pressure is abnormal, the temperature exceeds 120℃, or the oil quality deteriorates, repair immediately. When replacing bearings, check the turbine shaft wear. If the journal wear exceeds 0.02 mm, replace the turbine shaft simultaneously. Do not mix bearings of different models or brands.
