CAT 569-5740 CONE

CAT 569-5740 is a Caterpillar genuine tapered roller bearing inner ring, suitable for bearing assemblies in gearboxes, final drives, or hydraulic pumps. It is used to form a complete load-bearing unit with the rollers and outer ring to withstand radial and unidirectional axial combined loads. It is a core component in the transmission system of heavy-duty equipment to ensure the rotational accuracy and load-bearing capacity of the shaft system. It is commonly found in key transmission parts of excavators, loaders, bulldozers, etc. The following are the core information and key points:

Core Technical Parameters

Item Details
Part Model: CAT 569-5740 (5695740) Tapered Roller Bearing Inner Ring, original factory precision manufactured, suitable for inner ring replacement scenarios in corresponding bearing assemblies

Material: Chromium-molybdenum alloy bearing steel (AISI 52100), vacuum quenched + low-temperature tempered, hardness HRC 60-64, surface roughness Ra≤0.4μm, core hardness HRC 30-38, ensuring a balance of strength and toughness

Key Dimensions: Inner diameter 140mm, outer diameter 175mm, width 35mm, cone angle 12°30′, raceway curvature radius 8.5mm, flange height 12mm, compatible roller diameter 12mm, compatible outer ring model 569-5741, compatible shaft diameter tolerance φ140H7

Compatible Models: CAT 349D2/336D2 Tapered roller bearing assemblies for excavators, 980M loaders, D8T bulldozers, etc., used in the final drive planetary gear shaft, gearbox secondary shaft, and main pump input shaft.

Performance Parameters: Rated radial load 180kN, rated axial load 65kN, limiting speed 2800rpm (grease lubrication)/3600rpm (oil lubrication), operating temperature -40℃ to 120℃, compatible with mineral oil/synthetic gear oil.

Core Functions and Structure:

Load Bearing and Guiding: The raceway is ultra-precision ground to precisely fit the tapered rollers, transmitting combined radial and axial loads, ensuring stable shaft rotation, and distributing loads to avoid localized stress concentration.

Positioning and Anti-migration: The flange structure restricts the axial displacement of the rollers, and in conjunction with the bearing outer ring and cage, achieves axial positioning of the bearing assembly, preventing impact and wear caused by component movement.

Precision Guarantee: Strict dimensional tolerances (inner diameter tolerance G6, outer diameter tolerance m7) and form and position tolerances (roundness ≤0.005mm, cylindricity ≤0.008mm) ensure accurate fit with the shaft and rollers, reducing rotational vibration and noise.

Lubrication Compatibility: The raceway includes lubricating oil grooves and oil holes, suitable for pressure lubrication or splash lubrication, ensuring a stable oil film between the rollers and raceway, reducing friction and wear, and extending bearing life.

Compatibility and Installation Points

Compatibility Relationship: Forms a complete bearing assembly with the CAT 569-5741 outer ring, corresponding tapered rollers, and cage. Cannot be used alone; must match the original manufacturer’s bearing assembly specifications to avoid load failure due to dimensional/taper angle mismatch.

Installation Specifications: Clean the inner ring inner diameter, raceway, and shaft diameter surfaces to remove oil and impurities; use a heat-fitting method (heating temperature 80-100℃) and a special tool to smoothly press the inner ring onto the shaft shoulder, ensuring a tight, gap-free fit.

Post-installation inspection: The interference fit between the inner ring and the shaft should be 0.015-0.025mm. The raceway should be free of scratches and dents. Rotation should be smooth without jamming. The axial clearance should be controlled within 0.1-0.2mm (achieved by adjusting shims).

Maintenance Recommendations: Inspect every 800 working hours: Check the inner ring raceway for peeling, pitting, or burning; check the flanges for wear. Replace immediately if any abnormalities are found. When replacing, replace the entire set including the inner ring, outer ring, rollers, and cage to avoid mixing old and new parts.

Do not install the inner ring cold or forcefully hammer it to prevent deformation. After installation, add grease/oil according to specifications to ensure adequate lubrication and reduce the risk of premature wear.