CAT 153-8439 BEARING TPR

CAT 153-8439 is a Caterpillar single-row tapered roller bearing (tapered bearing) used to withstand combined radial and axial loads. It is suitable for heavy-duty transmission components such as gearboxes, axles, and final drives. The following is structural technical and application information.

Core Technical Parameters

Item Details
Basic Attributes Model 153-8439, Type Single-row tapered roller bearing (inner/outer ring separable), Material Bearing steel (GCr15SiMn), carburized and quenched, Single weight approx. 2.3 kg, Applicable pressure Radial ≤50 MPa, Axial ≤25 MPa, Applicable temperature -30℃ to +120℃, Lubrication method Grease lubrication/Oil lubrication, Contact angle 15°, Clearance grade C3, Surface hardness HRC 60-64, Rated life ≥10000 hours

Key Dimensions Inner diameter 75 mm (tolerance P6), Outer diameter 130 mm (tolerance P6), Width 32 mm, Number of rollers 18, Roller diameter 12 mm, Length 22 mm, Inner ring large end diameter 102 mm, Outer ring small end diameter 98 mm, Chamfer 1.5 mm, Coaxiality ≤0.008 mm, roundness ≤0.005 mm
Compatible Models and Parts: Compatible with Cat 320GC/323GC excavator swing gearbox, 950M loader gearbox second axle, 120M grader axle differential, 1-2 pieces per part, installed in pairs (face-to-face/back-to-back), suitable for speeds ≤3600 rpm

Performance Parameters: Radial rated dynamic load 112 kN, radial rated static load 145 kN, axial rated dynamic load 48 kN, axial rated static load 102 kN, grease lubrication limiting speed 3200 rpm, oil lubrication limiting speed 4000 rpm, recommended preload 50-80 N・m, installation interference 0.010-0.020 mm

Structural and Performance Advantages: Separable Structure: The inner ring (cone) and outer ring (cup) are separable, facilitating installation, disassembly, and maintenance. Worn parts can be replaced individually, reducing maintenance costs.

Composite Load Compatibility: A 15° contact angle design allows for simultaneous radial and axial load bearing, suitable for gearboxes, axles, and other components subjected to combined stresses, preventing axial movement.

Precision Manufacturing Process: Carburizing and quenching treatment, surface hardness HRC 60-64, improves wear resistance and fatigue strength; C3 clearance adapts to high-temperature conditions, reducing the risk of thermal expansion and seizure.

High Reliability Design: Rollers and raceways are precision ground, roughness Ra≤0.1 μm, reducing friction and wear; rated life ≥10,000 hours, suitable for heavy-duty impact conditions.

Installation and Maintenance Points: Before installation, clean the bearing, journal, and bearing housing, checking for cracks and peeling; heat the inner ring (80-100℃) for hot mounting or cold pressing installation; when installing in pairs, control the preload force to 50-80 N・m; after installation, check the axial clearance to be 0.10-0.15 mm.

Maintenance Cycle: Check the grease/oil condition every 1500 hours, replenish grease every 3000 hours (filling the bearing cavity with 1/3-1/2), measure the bearing clearance every 5000 hours, and replace the bearing if the clearance exceeds 0.25 mm. Replace the filter element regularly to maintain lubrication cleanliness at ISO 18/15.

Common Faults and Solutions: Bearing overheating is caused by excessive preload or insufficient lubrication; adjust the preload and replenish lubrication. Abnormal noise is caused by roller wear or foreign object intrusion; replace the bearing and clean it. Excessive clearance is caused by long-term wear; replace the bearing and repair the journal/bearing housing.