CAT 613-6168 152.4mm Inner Diameter Self-Aligning Bearing

CAT 613-6168 is a Caterpillar double-row self-aligning roller bearing with an inner diameter of 152.4 mm (6 inches). It is suitable for slewing bearings, drive axles, or boom hinges of large excavators/loaders, compensating for installation coaxiality errors and shaft deflection. It can withstand heavy radial loads and is compatible with bidirectional axial loads. It is suitable for Cat 336GC/349GC excavators, 980GC loaders, and other models. The following is structured professional information.

Core Parameters (Professional Version)

Item Details
Basic Attributes Model 613-6168, Quantity per unit: 1 piece, Fitting shaft diameter: 152.4 mm, Matching adapter sleeve H3130, Locating nut 108-2745, Seal 374-0721, Single weight: 38.5 kg, Includes inner ring, outer ring, double-row drum rollers, brass cage, grease nipple

Key Dimensions Inner diameter 152.4 mm (Tolerance H7: 0–+0.040 mm), Outer diameter 270 mm (Tolerance g6: 0–-0.030 mm), Width 73 mm (Tolerance ±0.15 mm), Roller diameter 28 mm, Cage center circle diameter 210 mm, Lubrication hole M10×1.5 (depth 25 mm), Chamfers at both ends 2×45° (Tolerance ±0.1 mm)

Material and Process Inner / The outer ring is made of chromium-molybdenum alloy steel (42CrMo), integrally quenched and tempered (hardness HB280–320), with raceway surface hardened (hardened layer depth 2.0–2.5 mm, surface hardness HRC52–58); the rollers are made of high-carbon chromium bearing steel (GCr15SiMn), integrally hardened (HRC60–64); the cage is made of H62 brass, integrally machined, with a flatness ≤0.03 mm.

Performance Parameters: Rated radial dynamic load 920 kN, rated radial static load 1450 kN, rated bidirectional axial load 280 kN, allowable self-aligning angle ≤1.5°, limiting speed (grease lubrication) ≤1200 rpm, operating temperature -30℃ to +120℃, compatible with Cat MTO-1000 lithium-based grease, fatigue life ≥15000 hours (standard operating conditions).

Compatible Models: Cat 336GC/340GC/349GC Excavators, 980GC/982GC loaders, CS64B vibratory rollers, equipped with slewing bearings 238-7800 and drive axle housings 195-6700.

Installation and Maintenance Points: Before installation, clean the inner and outer rings of the bearing and the shaft/bearing housing. The shaft diameter needs to be machined to φ152.4h6 (tolerance 0–-0.025 mm), and the bearing housing hole should be φ270J7 (tolerance +0.010–+0.040 mm). Use hot fitting (heating at 100℃ for 2 hours) or cold fitting (freezing at -30℃ for 2 hours). The pressing force should be ≤120 kN. Ensure the bearing end face fits snugly with the locating surface (gap ≤0.05 mm). Tighten the adapter sleeve to a torque of 350 N・m and apply thread-locking adhesive.

Maintenance Cycle: Every 250 hours, add Cat-specific lithium-based grease (the amount added should overflow from both ends of the bearing). Check bearing clearance (replace if radial clearance > 0.5 mm). Replace damaged seals immediately.

Troubleshooting: If abnormal noise/excessive temperature rise/increased vibration occurs during operation, prioritize checking for bearing wear, broken rollers, damaged cages, and lubrication failure. Replace components and repair shaft/bearing housing mounting surfaces if necessary.