CAT 361-1902 BEARING

CAT 361-1902 is a Caterpillar genuine single-row tapered roller bearing, commonly used in the hubs, differentials, or transmission systems of small and medium-sized excavators and loaders. It bears combined radial and unidirectional axial loads and is suitable for low to medium speed and medium load conditions. The following are the core original specifications and application information, excluding replacement parts.

Core Technical Parameters

Item Details
Part Model: CAT 361-1902 (BEARING – ROLLER, TAPERED)

Product Type: Single-row tapered roller bearing (inner ring + outer ring + roller + cage assembly)

Material: Inner/outer ring: High carbon chromium bearing steel (SUJ2/52100); Rollers: Same material; Cage: Stamped steel plate

Surface Treatment: Inner/outer ring raceways ultra-fine ground, surface roughness Ra ≤ 0.08 μm; Outer ring phosphated, inner ring galvanized and passivated, corrosion resistant

Hardness: Inner/outer ring HRC 60–64, rollers HRC 62–66, high wear resistance and contact fatigue strength

Single Weight: Approx. 0.85 kg (1.87 lbs)

Key Dimensions: Inner diameter 45 mm, outer diameter 85 mm, width 24 mm, cone angle 12°30′

Match Requirements Inner ring and shaft: interference fit (tolerance k5); Outer ring and bearing housing: transition fit (tolerance J7)
Radial clearance: Standard group (C3), clearance before installation 0.015–0.035 mm
Operating temperature: -40℃ ~ +120℃
Load capacity: Rated radial dynamic load 58 kN, rated axial dynamic load 32 kN; Rated static load 65 kN (radial) / 38 kN (axial)
Lubrication requirements: Compatible with lithium-based grease (NLGI 2), filler amount 30%–50% of bearing cavity volume
Structure and core characteristics: Composite load adaptable structure: Tapered rollers and raceways form a tapered contact, capable of simultaneously bearing radial and unidirectional axial loads. Suitable for hubs, differentials, and other parts requiring the transmission of composite loads, offering high transmission efficiency and stable operation.

High Precision and Wear Resistance: Ultra-precision grinding of the raceways reduces the coefficient of friction and minimizes wear; high-hardness material undergoes professional heat treatment to improve contact fatigue life, suitable for low-speed and medium-load conditions in construction machinery.

Corrosion Resistance and Easy Maintenance: Differentiated anti-corrosion treatment of inner and outer rings makes it suitable for harsh conditions such as humidity and dust; the split structure facilitates installation and disassembly, and maintenance is convenient; the inner or outer ring can be replaced individually (must match original factory specifications).

Compatible Models and Application Scenarios:
Excavators: Small tonnage models such as 305.5E2, 306E2, and 307E2, used for wheel hub bearings in the travel mechanism and output shaft bearings in the slewing gearbox.

Loaders: Medium and small models such as 906H, 907H, and 908H, suitable for drive axle differentials, wheel hubs, etc.

Core Application: Replaces worn and peeling old bearings, solving problems such as abnormal rotational noise, abnormal temperature rise, and excessive component clearance caused by bearing failure, restoring the operating accuracy of the transmission system and travel mechanism.