CAT 6I-9498 Pilot Bearing with Race

CAT 6I-9498 is a Caterpillar single-row needle roller guided bearing with seated race (imperial, with seated race assembly). It is suitable for Cat 320D/323D excavator swing motor output shaft, 950M loader gearbox secondary shaft, C13 engine camshaft front end, and 140M grader steering knuckle. It is used to withstand medium radial loads and light axial loads, and is suitable for low-speed, reciprocating, and positioning guidance conditions. It prevents shaft misalignment and wear, and ensures precise positioning of Cat® Parts in the drive and steering systems. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 6I-9498, Single-row needle roller guide bearing with seated race (assembly includes needle rollers + cage + seated race), suitable for Cat 320D/323D excavator swing motor output shaft, 950M loader gearbox secondary shaft, C13 engine camshaft front end, 140M grader steering knuckle, material is chromium-molybdenum alloy steel (needle rollers + seated race, carburized and quenched HRC61-65), cage is engineering plastic (PA66 + glass fiber, wear-resistant and self-lubricating), operating temperature -40℃ to +120℃, single weight approximately 0.85 kg, used to withstand medium radial loads and light axial loads, suitable for low-speed, reciprocating oscillation and positioning guidance conditions, preventing shaft misalignment and wear, ensuring accurate positioning of transmission and steering systems

Key Dimensions
Inner diameter 50.8 mm (2 inches, tolerance 0/-0.012 mm), outer diameter 76.2 mm (3 inches), seat ring thickness 12.7 mm (0.5 inches), needle roller diameter 4.762 mm, total width 25.4 mm (1 inch), radial clearance C2 (0.04-0.07 mm), mating tolerances: inner ring h6 (0/-0.012 mm), seat ring H7 (+0.030/0 mm)
Compatible models: Cat 320D/323D excavators (swing motor output shaft, stick pin guide), 950M/966M loaders (transmission shaft 2, drive shaft support), C13 engine (camshaft front end, balance shaft positioning), 140M grader (steering knuckle, rear axle guide shaft)
Assembly fit: inner ring interference fit with shaft (interference 0.005-0.010 mm), seat ring transition fit with bearing housing (clearance 0-0.015 mm), fit 50.8 mm For diameter shafts, the journal fillet radius should be ≤1.0 mm, coaxiality ≤0.02 mm, and the axial preload after installation should be 15-25 N·m. Installation and Maintenance Points: Before installation, clean the bearing assembly, journal, and bearing housing bore, checking for scratches, rust, and cracks. Measure the dimensions of the journal and bearing housing bore to ensure the fit meets requirements. The journal fillet radius should be ≤1.0 mm to avoid stress concentration at the needle roller ends.

Use the cold-press installation method. Use a special press to first press the bearing housing into the bearing housing, then fit the needle roller cage onto the journal. Do not directly strike the needle rollers or bearing housing to prevent deformation of the needle rollers and chipping of the bearing housing edges. After installation, adjust the axial preload to 15-25 N·m to ensure no axial movement.

Lubrication and maintenance: Grease filling amount should be 20-30% of the bearing internal space (Cat Moly Grease recommended). Oil lubrication is prohibited (suitable for low-speed conditions). Check bearing wear and clearance every 600 hours. If needle rollers show indentations, seat ring wear exceeds 0.1 mm, or radial clearance exceeds 0.15 mm, replace the bearing immediately.