CAT 542-1301 BEARING-ROLL

The CAT 542-1301 is a Caterpillar genuine single-row cylindrical roller bearing, suitable for the planetary gears of the swing gearbox, drive axle differential, and intermediate shaft of the Cat 320D/323D excavators and 950H loaders. It is used to withstand heavy radial and impact loads and limit the radial runout of the shaft. The following is pure raw data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 542-1301, Type Single-row cylindrical roller bearing (inner ring with flange, separable outer ring), Material Inner ring/outer ring/rollers are chromium-molybdenum alloy steel (carburized and quenched), Cage is stamped steel plate, Single weight 1.85 kg, Operating temperature -40℃ to +120℃, Rated service life ≥15000 hours, Lubrication method Grease lubrication (recommended Cat DEO-ULS No. 2 lithium-based grease), Sealing type Non-contact dust cover, Protection rating IP54, Applicable journal diameter φ70 mm, Applicable bore diameter φ110 mm

Key Dimensions Inner diameter 70 mm (tolerance 0/-0.015 mm), Outer diameter 110 mm (tolerance 0/-0.020 mm), Width 30 mm (tolerance ±0.10 mm), Number of rollers 22, Roller diameter 9 mm, Roller length 25 mm diameter, inner ring large end diameter 90 mm, outer ring small end diameter 95 mm, inner ring raceway radius of curvature 4.6 mm, outer ring raceway radius of curvature 4.7 mm, radial clearance after installation 0.02-0.05 mm
Performance parameters: Radial rated dynamic load 125 kN, radial rated static load 180 kN, limiting speed grease lubrication 3000 rpm, oil lubrication 3800 rpm, coefficient of friction ≤0.0015, hardness inner/outer ring HRC 60-64, roller HRC 62-66, elastic modulus 207 GPa, Poisson’s ratio 0.3, tensile strength ≥1200 MPa, yield strength ≥950 MPa, impact toughness ≥18 J/cm², corrosion resistance: neutral salt spray test ≥48 Rust-free within hours
Structural and Performance Advantages
Separate Structure: The inner ring has a flange, and the outer ring is separable, facilitating installation and maintenance. It adapts to complex cavity structures, allowing for individual replacement of worn parts and reducing maintenance costs.

Chromium-Molybdenum Alloy Steel Material: Carburizing and quenching treatment enhances surface hardness and core toughness, making it suitable for high-frequency vibration and heavy-load conditions in engineering machinery, reducing wear between rollers and raceways.

Non-Contact Dust Cover: Effectively prevents dust and oil from entering the bearing, reducing the risk of grease contamination and extending bearing life.

Single Row Cylindrical Roller Design: The rollers and raceways have line contact, providing strong load-bearing capacity, suitable for heavy radial load conditions, and ensuring the shaft’s rotational accuracy and stability.

Installation and Maintenance Points (Original Data)

Installation: Clean the journal and bearing housing bore (free of burrs/oil stains). Hot-fit the inner ring (oil temperature 80-100℃, heating time ≤30 minutes). Cold-fit the outer ring. Press-fit force ≤30 kN. After installation, check the radial clearance (0.02-0.05 mm). Tighten the nut torque to 120-150 N·m. Do not forcefully hammer or pry, as this may damage the raceway.

Maintenance: Check the bearing temperature every 1000 hours (≤80℃ is normal). Add grease every 2000 hours (1/3-1/2 of the bearing cavity volume). Replace the bearing every 15000 hours. Avoid overload operation (≤110% of rated load). Prevent high-speed idling of the bearing (≥120% of the limiting speed). Troubleshooting: Overheating of bearings is often due to insufficient lubrication or too small clearance; add grease and adjust the clearance. Abnormal noise is often due to worn rollers or peeling raceways; replace the bearing. Excessive radial runout is often due to excessive clearance; adjust the nut torque or replace the bearing.