Description
CAT 6Y-1757 BEARING
| CAT 6Y-1757 BEARING |
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The CAT 6Y-1757 is a Caterpillar original equipment manufacturer (OEM) cylindrical roller bearing for engine camshafts/balance shafts, suitable for diesel engines such as the 3176C, 3306, and C9/C9.3. Its core function is to support the high-speed rotation of the camshaft/balance shaft, withstand radial loads and periodic impacts, control the radial runout of the shaft system, ensure stable operation of the valve train/balance mechanism, and is suitable for high-temperature and vibration-prone engine conditions.
Core Technical Parameters
Item Details
Part Model: CAT 6Y-1757 (6Y1757) Cylindrical Roller Bearing, Original Part Number, No Official Direct Replacement
Material: Bearing steel (SUJ2/SAE 52100), rings carburized and quenched (HRC 60-64), rollers integrally quenched, cage made of phenolic resin/high-quality low-carbon steel, suitable for engine oil lubrication environment
Key Dimensions: Inner diameter 60mm, outer diameter 85mm, width 20mm, roller diameter 8mm, quantity 12, radial clearance 0.012-0.018mm, shaft fit tolerance h6, seat bore fit tolerance H7
Compatible Engines: CAT 3176C, 3306, C9, C9.3 engines, used for camshaft front/rear end support, balance shaft support, suitable for engine assemblies of excavators, loaders, trucks, etc.
Performance Parameters: Rated dynamic load 48kN, rated static load 52kN, limiting speed 8000r/min (oil lubrication), operating temperature -30℃ to 150℃, suitable for engine oil pressure 200-500kPa. Core Functions and Structure:
Radial Load Support: The cylindrical roller structure is suitable for high-speed rotation, supporting the camshaft/balance bearings against periodic radial loads from the valve train or balance weights, preventing shaft bending and deformation, and ensuring valve timing accuracy.
High-Speed Stable Operation: The cage precisely guides the roller movement, reducing friction between the rollers and raceways. Combined with engine pressure lubrication, an oil film is formed to reduce wear, suppress vibration and noise, suitable for the commonly used engine speed range of 1500-2200r/min.
Positioning and Runout Control: Precise fit with the shaft and housing bore controls the radial runout of the camshaft/balance shaft to ≤0.03mm, avoiding valve and piston interference and ensuring the vibration reduction effect of the balancing mechanism.
Installation and Maintenance Points
Installation Specifications: Clean the bearing, journal, and housing bore to remove oil and metal shavings. Inspect for cracks, rust, and pitting. The journal surface roughness Ra ≤ 0.8μm.
Cold-fit installation (apply pressure evenly using a special sleeve). Do not strike the bearing end face. After installation, check the radial clearance to ensure it is within the range of 0.012-0.018mm.
Ensure the oil passages are clear before installation. After assembly, add engine oil for pre-lubrication to avoid dry friction during startup.
Maintenance Recommendations: Every 1000 working hours, check the oil pressure and oil quality (metal shavings content). If a large amount of metal shavings are found in the oil, disassemble and inspect the bearing for wear.
This bearing must be replaced during engine overhaul. During replacement, simultaneously check the journal wear. If the wear exceeds 0.05mm, repair the journal or replace the entire bearing assembly.
