CAT 3S-4646 BEARING

CAT 3S-4646 is a Caterpillar double-row self-aligning roller bearing, suitable for the gearbox axle and drive axle differential of Cat 12G/140G/160G graders and D6/D7 bulldozers. It is used to bear radial heavy loads and bidirectional axial loads, compensate for shaft installation misalignment, and is a core load-bearing component of the transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 3S-4646, Type: Double row self-aligning roller bearing, Material: High carbon chromium bearing steel (GCr15SiMn, quenched and tempered), Single weight: Approximately 8.6 kg, Applicable temperature: -30℃ to +120℃, Lubrication method: Grease/oil lubrication (Grease lubrication recommended: Cat DEO-ULS 15W-40, Oil lubrication recommended: ISO VG 460), Clearance grade: C3 (Radial clearance 0.12-0.18 mm), Cage material: Stamped brass, Sealing type: Open, Installation method: Hot fitting (Heating temperature 80-100℃), Suitable shaft diameter: 120 mm, Suitable bore diameter: 215 mm

Key Dimensions
Inner diameter: 120 mm (Tolerance P6, +0.000/-0.011 mm), Outer diameter: 215 mm (Tolerance P6, +0.000/-0.011 mm), P6 (+0.000/-0.016 mm), width 65 mm (tolerance ±0.15 mm), rolling element diameter 22 mm, number of rolling elements 28 (double row), inner ring flange height 12 mm, outer ring raceway radius of curvature 11.2 mm, inner ring raceway radius of curvature 11.1 mm, chamfer size r=3 mm (tolerance ±0.2 mm), surface roughness Ra≤0.4 μm. Compatible Models and Applications: Compatible with Cat 12G/140G/160G grader gearbox secondary shaft, D6N/D7E bulldozer drive axle differential housing. Matching parts include 9M-3121 bearing housing and 6V-4215 locknut. Used for gearbox power transmission and drive axle differential torque output. Withstands radial load ≤420 kN, bidirectional axial load ≤180 kN, and compensates for shaft coaxiality deviation ≤0.5°. Performance Parameters Basic rated dynamic load Cr=580 kN, basic rated static load Cor=920 kN, limiting speed grease lubrication 1200 rpm, oil lubrication 1800 rpm, fatigue life ≥12000 hours, hardness HRC 60-64 (rings)/HRC 58-62 (rolling elements), impact toughness ≥35 J/cm², corrosion resistance meets ISO 9227 neutral salt spray test (48 hours rust-free).

Structural and Performance Advantages

Heavy-duty adaptability: Double-row symmetrical roller design can withstand large radial loads and bidirectional axial loads, suitable for the impact conditions of graders/bulldozers, increasing load capacity by approximately 40% compared to single-row bearings.

Self-aligning compensation: Spherical raceways can compensate for shaft installation misalignment and deformation, avoiding localized wear caused by edge contact, reducing vibration and noise, and extending shaft life.

Stable Lubrication: The brass cage has good thermal conductivity, preventing roller overheating. C3 clearance is suitable for high-temperature conditions, reducing the risk of jamming due to thermal expansion.

Easy Installation: The open design facilitates lubrication and maintenance. The heat-fit process reduces installation difficulty. It is compatible with universal bearing installation tools, making maintenance and replacement efficient.

Installation and Maintenance Points: Before installation, clean the journal and bearing housing bore to remove burrs and oil. After heating the bearing to 80-100℃, quickly install it onto the journal. Use a dial indicator to check for radial runout ≤0.05 mm. Install the lock nut (torque 280-320 N・m). After locking, re-measure the clearance.

Every 1500 hours of maintenance, check the bearing temperature (≤80℃), vibration value (≤2.5 mm/s), and lubrication condition. For grease lubrication, add grease to 1/3-1/2 of the bearing cavity. For oil lubrication, change the lubricating oil regularly and filter it (accuracy ≤10 μm). Original parts should be given priority. Aftermarket parts must be matched in terms of material, heat treatment and clearance. Inferior bearings are prone to raceway peeling and shaft jamming, which increases maintenance costs and downtime.