CAT 7T-5526 RACE

The CAT 7T-5526 is a Caterpillar original equipment manufacturer (OEM) thrust bearing race for hydraulic torque converters. It is compatible with the power input shaft and turbine shaft of gearboxes and torque converters. Its core function is to provide raceway support for the thrust bearing, bear axial loads, position rotating components, prevent axial movement, and ensure smooth and efficient operation of the transmission system.

Core Technical Parameters

Item Details
Part Model: CAT 7T-5526 Thrust Bearing Seat Ring, original part number 7T5526, a one-way thrust bearing seat ring, with no official direct replacement model, often used in conjunction with 7T-5527 thrust bearing.

Material: High carbon chromium bearing steel (GCr15), quenched and tempered, surface hardness HRC 60-64, raceway surface roughness Ra≤0.08μm, wear-resistant and impact-resistant, suitable for heavy-duty conditions.

Key Dimensions: Outer diameter 120mm, inner diameter 85mm, thickness 10mm, thrust surface width 8mm, chamfer 1.5×45°, suitable for matching corresponding thrust bearing specifications and mounting shaft diameter, ensuring fitting accuracy.

Compatible Models: CAT 320C/330C excavators, 966H loaders, D6R bulldozers, 777D… Mining trucks use this type of bearing for the rear end of the gearbox input shaft, the front end of the hydraulic torque converter turbine shaft, and the thrust surface of the planetary gear carrier. It is compatible with torque converter and gearbox transmission systems and bears axial loads.

Performance Characteristics: Rated axial load capacity 80kN, operating temperature -40℃ to 120℃, limiting speed 2500r/min, ultra-precision ground raceway surface, low coefficient of friction, suitable for high-frequency start-stop and heavy-load impact conditions.

Core Functions and Structure:

Load Bearing: Provides a rigid raceway for the thrust bearing, bearing the axial thrust generated during torque converter and gearbox operation, preventing axial movement of rotating parts, and avoiding wear and damage to gears, bearings, and other components due to axial displacement.

Precise Positioning: Through precise fit with the shaft and housing, it positions the thrust bearing and rotating parts, ensuring coaxiality of the transmission system, reducing operating vibration and noise, and improving transmission efficiency and component lifespan.

Wear Protection: High-hardness bearing steel and ultra-precision raceway surface reduce friction and wear between the thrust bearing and the raceway, reducing energy loss and suitable for long-term, high-frequency, heavy-load operation.

Installation and Maintenance Points

Installation Specifications: Clean the raceway and mounting surface, removing oil and metal shavings. Check for deformation of the raceway and scratches on the raceway. The flatness tolerance of the mounting surface should be ≤0.02mm.

Install using either cold or hot mounting methods (heating temperature 80-100℃), ensuring an interference fit between the raceway and the mounting position (interference 0.01-0.02mm). After installation, check that the runout of the raceway end face is ≤0.03mm.

When installing the thrust bearing, ensure that the bearing and raceway are tightly fitted without misalignment. Secure the bearing cage to prevent displacement during operation.

Maintenance Recommendations: Every 1500 working hours, check the raceway for pitting and peeling, and the end face for wear. If damage is found, replace the raceway and the matching thrust bearing immediately.

Regularly change the gearbox oil, maintaining its cleanliness (NAS 9 grade) to prevent contaminants from entering the clearance between the raceway and the bearing, leading to abnormal wear.