CAT 141-1211 BEARING

CAT 141-1211 is a Caterpillar large double-row tapered roller bearing, suitable for slewing bearings, final drives, or large gearboxes of mining excavators such as 5110B and 5230. It is used to withstand combined loads (radial + bidirectional axial) under heavy-duty conditions, ensuring stable operation of the transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 141-1211, Type: Double row tapered roller bearing (separable inner ring), Material: Rings/rollers are high carbon chromium bearing steel (chromium content 1.5%), Cage: integral machined brass, Rollers: bainitic hardened (hardness HRC60-64), Single weight: approximately 38.8 kg, Applicable temperature: -30℃ to +120℃, Lubrication method: oil lubrication, Limiting speed: oil lubrication 850 rpm, Sealing type: contact type double lip seal, Protection rating: IP54

Key Dimensions
Inner diameter: 241.3 mm (suitable for journal tolerance js6), Outer diameter: 355.6 mm (suitable for housing bore tolerance J7), Width: 101.6 mm (tolerance ±0.25 mm), Roller diameter: 28.575 mm, Number of rollers: 32, Taper angle: 15°, Clearance rating C3 (radial clearance 0.25-0.35 mm before installation), fillet radius R=5 mm, ring wall thickness 18.0 mm
Compatible Models and Applications: Compatible with Cat 5110B, 5130, 5130B, 5230, 5230B mining excavators, 6015B mining loaders, used for slewing bearing drive gear shaft, final drive planetary carrier output shaft, and large hydraulic pump input shaft. Matching parts include bearing housing 141-1215 and locknut 141-1216. Bears composite loads, suitable for low-speed heavy-duty transmission parts, transmitting large torque and compensating for installation deviations.

Performance Parameters: Rated dynamic load 2850 kN, rated static load 5200 kN, contact fatigue life ≥15000 hours, coefficient of friction ≤0.002, permissible skew angle ≤0.5°, suitable for impact load ≤1.2 times rated dynamic load conditions, ultimate axial load 1200… kN (Bidirectional)
Structural and Performance Advantages
Double-row Load-bearing Structure: Symmetrical double-row roller arrangement, simultaneously bearing radial and bidirectional axial loads, significantly exceeding the load-bearing capacity of a single-row design. Suitable for heavy-duty mining equipment, reducing the number of bearings and installation space.

Separable Inner Ring Design: The inner ring can be separated from the outer ring, facilitating installation, disassembly, and maintenance. The inner ring or rollers can be replaced individually, reducing maintenance costs and improving maintenance efficiency.

Brass Cage: The integrally machined brass cage offers high strength and excellent heat dissipation, precisely positioning the rollers and preventing roller misalignment and friction. Suitable for stable operation under low-speed, heavy-load conditions, extending service life.

High-Precision Taper Angle Design: A 15° taper angle matches the mounting surface. Clearance adjustment via preload reduces impact vibration, improves transmission accuracy, and is suitable for frequent start-stop conditions such as rotary and final drive applications.

Installation and Maintenance Points
**Before installation, clean the bearing, journal, and housing bore. The journal surface hardness must reach HRC58-64, the hardened layer depth ≥3.0 mm, and the surface roughness Ra ≤0.4 μm.** Use a hydraulic nut for installation, controlling the preload force at 120-150 kN, ensuring coaxiality ≤0.10 mm. Do not directly strike the bearing rings to avoid deformation.

After installation, add Cat DEO-ULS machine oil and run for 60 minutes to confirm there is no jamming or abnormal noise. The bearing temperature should be ≤80℃, and the axial runout ≤0.15 mm. Regularly monitor vibration values ​​(≤2.5 mm/s).

Maintenance: Check the bearing condition every 2000 hours. Replace immediately if pitting occurs on the rollers, cracks appear on the bearing rings, or radial clearance >0.6 mm. Prioritize original parts, ensuring the material and heat treatment meet standards to avoid damage to transmission components due to incompatible parts.