CAT 439-7596 BEARING

CAT 439-7596 (4397596) is a Caterpillar single-row cylindrical roller bearing. It is primarily used in the planetary carriers, final drive planetary gear shafts, or differentials of CAT 980G/980H loaders, D9 bulldozers, and other models. It is used to withstand radial heavy loads under high-speed rotation conditions, suppress gear drive eccentricity, and ensure the stability of the transmission system. The following are the core information:

Core Technical Parameters
Item Details
Part Model: CAT 439-7596 (4397596) Single-row cylindrical roller bearing (with cage, no inner ring, suitable for journal mounting)

Core Materials: Inner ring/outer ring: Chromium-molybdenum alloy steel (42CrMo), integrally hardened (HRC 60–64); Rollers: High-carbon chromium bearing steel (GCr15), ultra-finely ground surface (Ra≤0.08 μm); Cage: Phenolic resin + glass fiber, high strength + Self-lubricating, suitable for heavy-duty, high-speed operation.

Key Dimensions: Inner diameter 90 mm, outer diameter 140 mm, width 35 mm, roller diameter 12 mm, number of rollers 18, cage pitch circle diameter 115 mm, compatible journal diameter 90 mm (journal surface hardness HRC≥58)

Single Weight: Approx. 2.8 kg

Compatible Machines: CAT 980G/980H/966H loaders (gearbox second axle/planetary carrier), D9/D9T bulldozers (final drive planetary gear shaft), 320D2/329D2 excavators (slewing mechanism planetary gearbox), 777 mining trucks (differential side bearing), used for radially heavy-duty, medium-to-high-speed rotating transmission components.

Operating Fit: Maximum radial load 180 kN, maximum speed 3600 rpm, operating temperature -30℃ to +120℃, compatible with mineral oil-based gear oil (ISO VG). 100), capable of withstanding impact loads and vibration.

Core Functions and Structural Features:

Radial Heavy-Duty Adaptation: Single-row full-roller + cage design, large contact area, capable of withstanding continuous radial heavy loads in engineering machinery gearboxes and final drives, preventing journal and gear misalignment, reducing transmission impact, suitable for heavy-duty working conditions in mining and infrastructure.

High-Speed ​​Stable Transmission: GCr15 rollers + ultra-precision ground surface, low coefficient of friction (≤0.002), phenolic cage reduces roller friction and noise, suitable for medium- and high-speed rotation conditions, ensuring transmission efficiency and smoothness.

Inner Ring-less Journal Mounting: Inner ring-less design, direct interference fit with journal (0.015–0.03 mm), reducing the number of parts, reducing assembly errors, improving transmission accuracy, suitable for compact installation space of large-diameter journals.

Impact and deformation resistance: The yield strength of 42CrMo material after quenching is ≥1000 MPa, and the fatigue life of the roller and raceway is ≥8000 h. It can adapt to the load fluctuation of the transmission system, prevent the bearing raceway from peeling off and the roller from breaking, and extend the service life of the components.