CAT 399-7737 BEARING-ROLL

CAT 399-7737 is a genuine Caterpillar Spherical Roller Bearing, designed for use with rotary cutting machine drive shafts. It absorbs radial and bidirectional axial loads and is compatible with misalignment between the shaft and bearing housing. The following are the original manufacturer’s precise specifications and application information; replacement parts are not included.

Core Technical Parameters

Item Details
Part Model: CAT 399-7737 (Single Row Self-Aligning Roller Bearing, Symmetrical Roller Design)

Material: Inner Ring / Outer Ring / Rollers: High Carbon Chromium Bearing Steel (GCr15SiMn), Cage: Brass, Heat Treatment Hardness HRC 60-64, Roller Surface Ultra-Grinded (Ra ≤ 0.08 μm)

Key Dimensions: Inner Diameter 60.00 mm (2.362 in), Outer Diameter 130.00 mm (5.118 in), Width 31.00 mm (1.220 in), Number of Rollers: 18, Roller Diameter 14.00 mm, Outer Ring Spherical Radius 150.00 mm

Performance Parameters: Dynamic Rated Load 115 kN, Static Rated Load 108 kN, Limiting Speed ​​3200 rpm (Grease Lubricated), Operating Temperature -40℃ to +120℃, Permissible Misalignment Angle ≤ 1.5°
Single Weight: Approx. 1.45 kg (3.197 lbs)
Tolerances: Inner diameter tolerance P5 (+0.012/0 mm), outer diameter tolerance P6 (0/-0.015 mm), width tolerance ±0.15 mm, spherical radius tolerance ±0.20 mm
Core Features: Symmetrical roller design adapts to bidirectional axial loads; brass cage enhances high-speed stability; self-aligning capability compensates for installation errors; GCr15SiMn material enhances impact resistance and wear resistance.
Structure and Core Features:
Self-aligning roller structure: Utilizes a symmetrical spherical roller and spherical outer ring design, capable of simultaneously withstanding radial and bidirectional axial loads, adapting to the complex stress conditions of rotary cutting machine drive shafts. Allows for a misalignment error of ≤ 1.5° between the shaft and bearing housing, reducing edge stress.

Brass Cage: The brass cage possesses good thermal conductivity and wear resistance, reducing roller friction heat generation under medium-to-high-speed conditions, improving bearing operational stability, and extending service life. Ultra-precision grinding process: The roller surface undergoes ultra-precision grinding, achieving a surface roughness Ra ≤ 0.08 μm. This reduces the rolling friction coefficient, minimizes wear, and improves bearing rotational accuracy and smooth operation.

Sealing and lubrication: Open design, compatible with original equipment manufacturer (OEM) oil seals. NLGI 2 lithium-based grease is recommended, with a grease filling volume of 1/3-1/2 of the bearing cavity to avoid overheating.

Compatible models and application scenarios:
Compatible equipment: Drive shaft systems of CAT rotary cutting machines (such as some models of road cutting machines and mining cutting machines), and transmission components of some construction machinery.

Core application: Installed in the support section of the rotary cutting machine drive shaft, it supports the rotating shaft and transmits loads, absorbs radial and bidirectional axial forces, compensates for installation errors and shaft deflection, ensures stable operation of the drive system, and is suitable for medium-to-heavy-load, medium-speed rotational conditions.