CAT 543-3713 45mm Inner Diameter Roller Bearing

CAT 543-3713 is a Caterpillar single-row cylindrical roller bearing, suitable for planetary carriers, gearboxes, or final drive components in the transmission systems of excavators, loaders, etc. It is used to withstand heavy radial loads and impacts, is suitable for medium and low speed, high load conditions, ensures stable operation of transmission components, and reduces friction loss. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 543-3713, Type: Single-row cylindrical roller bearing (no seal, separable inner ring), Material: Chromium-molybdenum alloy bearing steel (AISI 52100, quenched + tempered, hardness HRC 60-64), Cage: Stamped steel, Single weight: Approximately 2.8 kg, Operating temperature: -40℃ to +120℃, Load type: Pure radial load + medium impact load, Lubrication method: Oil lubrication (recommended Cat DEO-ULS 15W-40) / Grease lubrication (Cat 2 lithium-based grease), Design life: ≥15000 hours (normal operating conditions)

Key Dimensions
Inner diameter: 101.6 mm (4 inches, tolerance 0/+0.015 mm), Outer diameter: 146.05 mm (5.75 inches, tolerance 0/-0.01 mm), Overall width: 44.45 mm mm (1.75 inches, tolerance 0/-0.1 mm), roller diameter 12.7 mm, number of rollers 16, inner raceway radius 6.4 mm, outer raceway radius 6.4 mm, inner raceway runout ≤0.01 mm, outer raceway runout ≤0.012 mm. Compatible Models and Parts: Compatible with Cat 336D2 and 349D2 excavators (final drive planetary carrier output shaft), 966M loader (transmission shaft 2), 320D2 hydraulic pump drive shaft; compatible with 543-3714 inner raceway, 543-3715 outer raceway, 380-7379 seal, 3B-8489 grease fitting, 1J-6472 retaining ring.
Performance Parameters: Radial rated dynamic load 380 kN, radial rated static load 450 kN, allowable linear velocity ≤3.5 kN. m/s, coefficient of friction ≤0.002 (oil lubrication), limiting speed 600 rpm (grease lubrication) / 1200 rpm (oil lubrication), impact load ≥300 kN
Structural and Performance Advantages: Made of chromium-molybdenum alloy bearing steel, quenched and tempered, balancing surface hardness and core toughness, suitable for heavy loads and impact conditions, reducing the risk of fatigue damage to rollers and raceways.

Single-row cylindrical roller line contact design, strong radial load capacity, separate inner ring for easy installation and disassembly, suitable for transmission components with large shaft diameters, high installation flexibility.

Stamped steel cage, high strength and light weight, ensuring uniform roller distribution, reducing inter-roller friction, suitable for medium-low speed, high load conditions, improving bearing operational stability.

Installation and Maintenance Points: Before installation, clean the bearing inner and outer rings, journal, and bearing housing, checking for cracks, rust, and dents. Measure the journal diameter (101.6 mm) and inner ring inner diameter, ensuring an interference fit of 0.01-0.02 mm.

Install using a heat-fit method (inner ring heated to 80-100℃), avoiding impact. After installation, check the bearing clearance (0.15-0.25 mm) to ensure smooth operation. The outer ring and bearing housing should have a transition fit (clearance 0.005-0.01 mm).

Maintenance: Check lubrication every 1500 hours. For oil lubrication, maintain an oil pressure of 0.2-0.3 MPa. For grease lubrication, replenish grease every 2000 hours. If pitting or peeling appears on the roller surface, replace the bearing immediately.