CAT 393-2895 BEARING

CAT 393-2895 is a Caterpillar single-row cylindrical roller bearing (outer ring assembly) for heavy-duty hydraulic pumps/motors and gearboxes, suitable for medium-to-high speed, heavy-duty radial positioning applications. The following is raw data only, without replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 393-2895, Type Single Row Cylindrical Roller Bearing (Outer Ring + Rollers + Cage Assembly), Material Bearing Steel (52100), Single Weight 2.68 kg (5.91 lbs), Operating Temperature -40℃ to +120℃, Surface Treatment Vacuum Hardened, Hardness HRC 60-64, Rated Life ≥15000 hours (Standard Conditions)

Key Dimensions (Metric/Imperial) Inner Diameter 85.00 mm (3.3465 in), Outer Diameter 130.00 mm (5.1181 in), Width 36.00 mm (1.4173 in), Roller Diameter 7.94 mm, Number of Rollers 24, Cage Material Phenolic Resin, Chamfered Ends 1.5×45°, Raceway Surface Roughness Ra≤0.4 μm, Roundness ≤0.01 mm, wall thickness difference ≤0.02 mm
Matching and Performance Parameters: Suitable for shaft diameter 85.00 mm (k6 tolerance), suitable for bore diameter 130.00 mm (H7 tolerance), radial clearance 0.035-0.055 mm, rated radial load ≥145 kN, permissible maximum speed 4200 rpm (grease lubrication), 4800 rpm (oil lubrication), limiting speed 5500 rpm (oil lubrication)

Structure and Adaptability Characteristics: Separable outer ring design: The outer ring and roller assembly are separable, facilitating installation and maintenance, suitable for parts requiring radial positioning and axial displacement compensation, such as gearbox output shafts and hydraulic pump drive shafts.

Phenolic cage structure: High-strength phenolic resin cage, lightweight and wear-resistant, suitable for medium and high-speed operating conditions, reducing roller friction and noise, and improving rotational accuracy.

Sealing Adaptation: A pre-drilled sealing groove on the outer ring accommodates a fluororubber (FKM) skeleton oil seal with an IP55 protection rating, suitable for high-temperature, high-pressure, and dusty operating environments in construction machinery.

Compatible Models and Application Scenarios:

Excavators: Output end of hydraulic main pumps/slewing motors such as 336D2 and 349D2, handling heavy radial loads and positioning.

Loaders: Second and third axles of gearboxes such as 966M and 972M, suitable for medium-to-high-speed shifting and impact conditions.

Mining Equipment: Auxiliary hydraulic system pump shafts such as MT4400 and MT5500, suitable for continuous operation and high-frequency start-stop scenarios.

Installation and Maintenance Points (Original Data):

Installation: Clean the outer ring, journals, and mounting holes, ensuring they are free of oil, metal shavings, and other contaminants. Journal dimensions should conform to k6 tolerance, and mounting hole dimensions should conform to H7 tolerance.

Cold press fitting: Apply pressure evenly to the outer ring end face using a dedicated press. Do not strike the rollers. After installation, control the radial clearance to 0.035-0.055 mm.

Fill with NLGI Grade 2 extreme pressure lithium-based grease, filling to 1/3 of the bearing cavity. Replenish lubrication after installation.

Maintenance: Check the radial clearance every 1500 hours. If the clearance > 0.18 mm, replace immediately.

Replenish grease every 2000 hours. Under harsh operating conditions (high temperature/dust), shorten this to 800 hours/time to prevent raceway wear.