CAT 569-4229 Double Row Cylindrical Roller Bearing

CAT 569-4229 is a Caterpillar double row full complement cylindrical roller bearing (NNF type), which is suitable for the drive axle main reducer and differential shaft end of large wheel loaders such as Cat 980K and 982M. It is used to withstand extreme radial heavy loads and impact loads, and is suitable for low-speed and high-torque conditions to ensure stable operation of the transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 569-4229, Type: Double row full complement cylindrical roller bearing (NNF type), Material: High carbon chromium bearing steel (SUJ2), Surface carburizing and quenching + nitriding treatment, Hardness: HRC62-65, Single weight: Approximately 5.2 kg, Operating temperature: -40℃ to +150℃, Suitable shaft diameter: 65 mm, Rated radial load: 280 kN, Limiting speed: 300 rpm, Fatigue life: ≥8000 hours

Key Dimensions
Inner diameter: 65.0 mm (tolerance 0/+0.025 mm), Outer diameter: 100.0 mm (tolerance 0/-0.025 mm), Width: 55.0 mm (tolerance ±0.12 mm), Roller diameter: 6.0 mm, Number of rollers: 42, Cage: Integral brass, Radial clearance: 0.03-0.06 mm, end face runout ≤0.04 mm
Compatible Models and Applications: Compatible with Cat 980K and 982M wheel loaders, used in the drive axle main reducer input shaft and differential half shaft. Matching shaft models are 154-7890 and 154-7891. Suitable for low-speed, heavy-load conditions, bearing impact loads during starting and braking.
Performance Parameters: Coefficient of friction ≤0.006, impact load resistance ≥350 kN, salt spray corrosion resistance meets ISO 9227 standard (no rust after 72 hours), oil lubrication (recommended Cat DEO-ULS 15W-40 oil), lubrication cycle synchronized with the main unit oil change cycle (approximately 2000 hours).
Structural and Performance Advantages: Double-row full complement roller design, load capacity increased by approximately 120% compared to single-row bearings, suitable for extreme radial loads during heavy-duty loader operation, reducing shaft deformation and vibration.

The integral brass cage provides high strength and excellent thermal conductivity, preventing roller jamming and ensuring stable operation of the transmission system under low-speed, high-torque conditions.

Carburizing and nitriding treatment results in high surface hardness, good core toughness, and excellent impact and wear resistance, making it suitable for harsh environments with dust and vibration, extending service life.

Inner and outer rings with locating flanges enable bidirectional axial positioning of the shaft system, simplifying installation, improving assembly accuracy, and reducing additional wear caused by axial movement.

Installation and Maintenance Points: Before installation, clean the bearing inner and outer rings, journal, and bearing housing bore, checking for scratches and cracks. Use the hot fitting method (oil temperature 80-90℃) to fit the bearing onto the journal, avoiding direct impact. After installation, use a dial indicator to check radial and axial runout to ensure compliance with requirements.

After installation, add sufficient lubricating oil, check for smooth rotation without jamming, and run under no-load for 10 minutes to confirm no abnormal noise or temperature rise. Do not force installation by cold hammering to prevent bearing deformation and surface damage.

Maintenance: Check the oil level and quality every 500 hours, and replace the oil promptly if the quality deteriorates; disassemble and inspect the bearing for wear every 2000 hours. If the radial clearance is >0.10 mm or if there is peeling or pitting on the surface, replace it immediately; original parts must be used when replacing the bearing to ensure compatibility with the shaft system.