CAT 439-7581 BEARING

CAT 439-7581 is a Caterpillar genuine cylindrical roller bearing, suitable for transmission components such as planetary gears and differentials in gearboxes. It is used to withstand heavy radial loads and is suitable for low-to-medium speed, impact conditions. The following is precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 439-7581 (4397581) cylindrical roller bearing, weighing approximately 0.92 kg (2.03 lb), for radial support bearings in transmission planetary carriers/differential gear sets.

Core Material: Bearing steel (chromium-molybdenum alloy), cage is stamped steel, rollers are high-purity bearing steel, suitable for high-temperature, heavy-load conditions in transmission systems, fatigue-resistant, and impact-resistant.

Key Dimensions: Inner diameter 88.90 mm (3.50 in), outer diameter 139.70 mm (5.50 in), width 36.51 mm (1.4375 in), single-row cylindrical roller structure with cage, suitable for shaft diameters… 88.90 mm Mounting Position

Structural Features: Single-row cylindrical roller bearings, stamped steel cage, separable inner ring, suitable for radial heavy-duty and low-to-medium speed rotational conditions, ensuring stable gear set operation and reducing transmission noise and vibration.

Compatible Models: Compatible with planetary gear sets and differential half-shaft supports in gearboxes of CAT 950H/962H loaders, 140K/160K graders, 420F2/430F2 backhoe loaders, etc.

Accessories: Compatible with drive half-shafts/planetary gear shafts with a diameter of 88.90 mm. Matching installation tools: CAT 1U-7360 bearing puller, 3S-8359 mounting sleeve. During replacement, simultaneously check shaft diameter tolerances and surface roughness.

Core Functions and Installation Points:

Radial Heavy-Duty Support: Used in gearbox planetary carriers, differentials, etc., to bear radial loads, suitable for low-to-low speed, high-load, and impact conditions in the transmission system, ensuring stable power transmission.

Installation Specifications: Clean the mounting holes, shaft diameter, and bearing surface, removing oil and burrs. Check the fit of the inner ring to the shaft diameter (interference fit P6) and the outer ring to the mounting hole (clearance fit H7).

Use a special sleeve to press evenly, avoiding forceful hammering. Ensure the bearing end face fits snugly to the mounting position and that the cage is not deformed.

After installation, check the radial clearance (0.05-0.12 mm) to ensure smooth, unobstructed operation and no abnormal noise.

Maintenance Recommendations: Check the bearing’s operating condition every 1000 working hours. If roller wear, cage deformation, excessive clearance, or abnormal temperature rise is observed, immediately replace the bearing with an original manufacturer’s (OEM) bearing.

When replacing, always use the same model CAT 439-7581 OEM part to avoid transmission failure or gear wear due to incompatible dimensions/materials.