CAT 6V-9274 Bearing-Aligning

CAT 6V-9274 is a double-row self-aligning roller bearing designed by Caterpillar specifically for drive axle differentials and transmission output shafts. The outer ring has a spherical raceway, automatically compensating for angular misalignment between the shaft and bearing housing (≤1.5°). It is suitable for heavy-duty, vibration-prone, and poorly coaxial installation conditions, featuring high radial load capacity, shock resistance, and self-aligning characteristics. The following are the core information:

Core Parameters
Item Details
Basic Attributes
Model 6V-9274, Double-row self-aligning roller bearing (cylindrical bore, with cage), primarily bears radial loads, can withstand small amounts of bidirectional axial loads, suitable for drive axle differentials, transmission output shafts, and drive shaft support components.

Compatible Models
CAT 966, 972 loaders, D8, D9 bulldozers, 773, 775 mining dump trucks, suitable for C15, C18 engine transmission systems; one bearing is required per differential end of each piece of equipment.

Material and Manufacturing Process
Inner Ring / The outer ring is made of high-carbon chromium bearing steel (GCr15SiMn), integrally hardened (HRC 60-64); the cage is a one-piece brass design, and the rollers are symmetrical drum-shaped GCr15 with surface strengthening treatment; operating temperature -30℃ to +120℃, requires oil lubrication (viscosity ISO VG 46-68).

Key Dimensions: Outer diameter 165.10mm (6.5in), inner diameter 88.90mm (3.5in), width 57.15mm (2.25in), roller diameter 12.70mm, quantity 24 rollers, weight approx. 2.8kg, radial clearance C3 group (0.03-0.05mm).

Functional Parameters: Radial rated dynamic load 280kN, radial rated static load 420kN, limiting speed 4000rpm (oil lubrication), interference fit mounting (shaft tolerance m6, hole tolerance H7), compatible with journal surface roughness. Ra≤0.8μm

Compatible Parts: Compatible with differential housing 6V-9275, gear shaft 6V-9276. Installation requires a special puller. It is recommended to use with gear oil. Replace the drive axle filter element regularly.

Alternative Models: Can replace older self-aligning roller bearings such as 310-6159 and 141-5952.

Installation and Maintenance Points:
Preparation before installation: Clean the mounting hole and journal surface, removing burrs, oil, and metal debris; check that the bearing rollers are intact and undamaged, and the cage is undamaged; measure the journal diameter and mounting hole diameter to ensure the interference fit is within specifications; the journal surface must be hardened (HRC≥58) and the roughness must meet requirements.

Installation Steps: Heat the bearing inner ring to 80-100℃ (hot mounting method), or use a special press to smoothly press it into the journal (pressing force ≤30kN). Do not strike the bearing inner or outer rings. Install the outer ring, ensuring the shaft and bearing coaxiality is ≤0.05mm. Install the differential housing or transmission components, tightening the fixing bolts to the specified torque (e.g., differential end cover bolt torque 120-140N・m).

Maintenance and Replacement: Check the bearing’s operating condition every 3000 hours, listening for abnormal noises and measuring the temperature. Check for metal debris in the oil each time you change the drive axle oil. Replace the bearing immediately if the bearing rollers are worn, the cage is damaged, or the radial clearance exceeds the limit.