CAT 481-2038 BEARING

CAT 481-2038 is a commonly used single-row cylindrical roller bearing in Caterpillar construction machinery. It is suitable for medium-to-large excavators and loaders, including planetary gearboxes and final drives, operating at low to medium speeds and heavy loads. It is used to withstand large radial loads and stably transmit power. The following is precise technical and application information:

Core Technical Parameters
Item Details
Part Model: CAT 481-2038 (4812038) Single-row cylindrical roller bearing, weighing approximately 0.87 kg (1.92 lb), cageless full-roller design, no seals on either side, suitable for oil lubrication.

Core Materials: Inner and outer rings and rollers (GCr15SiMn bearing steel, hardness HRC 61-65, carburized layer depth 1.0-1.2 mm); Cage (none, full-roller design); Lubrication method (forced oil lubrication, suitable for oil temperatures -30℃ to +150℃)

Key Dimensions: Inner diameter 60 mm, outer diameter 110 mm, width… 28 mm diameter, roller diameter 9.525 mm, number of rollers 16, pitch circle diameter 85 mm, radial clearance (C4 group) 0.030-0.050 mm, compatible shoulder diameter 65 mm, bearing housing bore diameter 110 mm

Rated Parameters: Rated radial dynamic load 85.2 kN, rated radial static load 102.5 kN, limiting speed (oil lubrication) 4500 r/min, operating temperature -30℃ to +150℃, rated life (10⁶ rpm) 2800 hours, compatible lubricant ISO VG 46 hydraulic oil / gear oil

Suitable Working Conditions: Medium and low speed heavy load, continuous rotating parts, suitable for vibration, impact, and dust conditions, mainly bearing radial loads, not suitable for pure axial load conditions

Compatible Models: CAT 320D2/323D2 excavators (gearbox planetary carrier), 950GC/966M Loader (final drive), 336D2 excavator (slewing gearbox), 420F2 loader (drive axle differential)

Supporting Components: Adaptor shaft 481-2037, bearing housing 481-2038, retaining ring 5K-8591, bolt 106-7773 (M12×30), grease nipple 1U-8878

Core Functions and Structural Features:

Heavy Load Bearing: Full roller design, large contact area, strong radial load capacity, suitable for heavy-duty conditions such as gearboxes and final drives, stably transmitting torque.

High Rigidity: Cylindrical rollers in contact with raceway lines, high rigidity, suitable for engineering machinery conditions with impact loads, reducing deformation and vibration.

Oil Lubrication Compatibility: Seal-free structure, suitable for forced oil lubrication systems, good heat dissipation and lubrication effect, suitable for medium and high-speed continuous operation.

Precise Installation: Standard size fits universal mounting base, requires proper positioning with shaft shoulder and bearing housing. Radial clearance after installation must meet C4 group requirements to ensure operational accuracy.

High Adaptability: Compatible with various lubricating oil media, adaptable to common temperature and pressure conditions in engineering machinery, offering high versatility.

Installation and Maintenance Points:
Installation Specifications: Clean the shaft and bearing housing mounting surfaces, removing burrs and oil contaminants. Check the bearing for rust, scratches on the raceway, and damage to the rollers.

Cold mounting (room temperature press mounting): Apply pressure evenly to the inner ring (mounted on the shaft) or outer ring (mounted in the bearing housing) to prevent roller deformation due to stress.

After installation, check the radial clearance to ensure it is within the C4 group range. Test run without jamming or abnormal noise; temperature rise ≤25℃.

Maintenance Recommendations:
Check the bearing condition every 1000 working hours. Replace immediately if abnormal noise, excessive temperature rise, or excessive clearance occurs.

Regularly check the lubricating oil level and cleanliness to ensure the forced oil lubrication system is unobstructed and prevent dry friction from accelerating wear.