CAT 305-2119 BEARING

CAT 305-2119 (30502119) is a Caterpillar single-row tapered roller bearing, suitable for drive axles/differentials in excavators, loaders, and other equipment. The following is precise information:

Core Parameters and Information

Item Details
Part Model: CAT 305-2119 Bearing

Part Type: Single-row tapered roller bearing (including inner ring, outer ring, rollers, and cage), used in drive axles/differentials, bearing combined radial and axial loads

Material: Bearing steel (GCr15SiMn), inner and outer rings and rollers integrally hardened (HRC 60–64), cage is made of stamped steel plate, seals are made of nitrile rubber

Key Dimensions: Inner diameter 45.00 mm (1.772 in), outer diameter 85.00 mm (3.346 in), width 24.00 mm (0.945 in), outer ring width 20 mm, inner ring width 23 mm, contact angle 15°

Structural Features Separable structure, the inner ring is separable for easy installation and clearance adjustment; features a contact-type double-lip seal to prevent dust and moisture intrusion.

Compatible Structure: Matches differential half-shaft gears and drive axle housings; used at the differential output end and half-shaft support.

Suitable Working Conditions: Heavy load, low to medium speed; suitable for dusty, muddy, and high-vibration outdoor working environments.

Compatible Models:
CAT 312C/312D/312D2 excavators (drive axle differential area)
CAT 938G/950G wheel loaders (front drive axle half-shaft support area)
CAT 420D/430D wheel excavators (drive axle differential output end)

Installation and Fitting Points: The inner ring and shaft have an interference fit (0–0.018 mm), and the outer ring and bearing housing have a clearance fit (0.015–0.030 mm), ensuring smooth and unobstructed operation.

Use a dedicated press-fit tool for cold pressing assembly; do not directly strike the inner and outer rings. Adjust the axial clearance to 0.02–0.04 mm during installation.

Before installation, clean the journal and bearing housing bores, removing burrs, rust, and impurities. Check the integrity of the seals.

Axially position the bearings using the end cap/lock nut to prevent movement. After installation, check for smooth rotation, no abnormal noise, and no axial movement.

Add the specified extreme pressure grease according to the model manual. After initial lubrication, check the lubrication status and replenish grease every 1000 working hours.