CAT 8U-7753 BEARING

CAT 8U-7753 is a Caterpillar original single-row tapered roller bearing, mostly used in the gearbox, differential, or wheel hub of loaders, bulldozers, and other equipment. It is suitable for medium and heavy load conditions, can withstand radial loads and unidirectional axial loads, ensures stable operation of transmission components, and is a key wear part of the transmission system. The following are the core information and key points:

Core Technical Parameters

Item Details
Part Model CAT 8U-7753 (8U7753) Single Row Tapered Roller Bearing, Original Equipment Manufacturer (OEM), Matching Inner and Outer Rings and Roller Assemblies, No Universal Replacement Cat®…

Material Chromium-Molybdenum Alloy Steel (SAE 52100), Inner and Outer Ring/Roller Hardness HRC 60-64, Cage is Stamped Steel Plate, Corrosion Resistance Rating ≥72 Hours Neutral Salt Spray Test

Key Dimensions Inner Diameter 63.5mm, Outer Diameter 130mm, Width 36mm, Chamfer r=2mm, Radial Clearance 0.01-0.02mm, Taper Angle 10°, Fitting Shaft Diameter Tolerance js6, Bearing Housing Tolerance H7

Compatible Models CAT 950B/C/D, 966B/C/D Loaders, D6D/E Bulldozer components used in transmission parts such as gearbox output shafts, differential half-shafts, and wheel hubs.

Performance Parameters: Dynamic rated load 120kN, static rated load 150kN, limiting speed 2500r/min (grease lubrication)/3200r/min (oil lubrication), operating temperature -40℃ to 120℃.

Core Functions and Structure:

Combined Load Bearing: The tapered roller design can simultaneously withstand radial and unidirectional axial loads, suitable for frequent start-stop and variable load operations in construction machinery, preventing bearing overload damage.

Precise Positioning: The inner and outer ring tapered surfaces ensure precise contact between the rollers and raceways, reducing vibration and noise in transmission components, maintaining rotational accuracy, and extending the life of gears, shafts, and other components.

Efficient Heat Dissipation: Suitable for grease or oil lubrication, rapidly transferring heat through the lubricating medium to prevent bearing overheating, suitable for continuous heavy-load operations.

Easy Assembly: The separate inner and outer ring design facilitates installation and disassembly, suitable for on-site maintenance and replacement, reducing maintenance difficulty. Installation and Maintenance Points

Installation Specifications: Clean the journal and bearing housing bore to remove oil and rust. Journal roughness Ra≤0.8μm, roundness≤0.01mm; use heat mounting (heat bearing to 80-100℃). Do not directly strike the inner or outer rings of the bearing.

During installation, adjust the axial clearance to 0.02-0.04mm. Ensure the bearing end face fits tightly against the shaft shoulder. Tighten the bearing housing bolts to the torque specified in the equipment manual (usually 60-80 N·m).

Maintenance Recommendations: Every 1000 working hours, check: bearing temperature (≤80℃), vibration value (≤4mm/s), and grease condition. If abnormal, replenish or replace the grease immediately. Replace the grease every 2000 working hours (grease lubrication).

Only use genuine 8U-7753 bearings. Do not substitute with ordinary tapered roller bearings to avoid insufficient load capacity or improper clearance leading to premature bearing failure and transmission component malfunctions.