CAT 569-4293 Double Row Cylindrical Roller Bearing

CAT 569-4293 is a Caterpillar double-row cylindrical roller bearing (NN type, separable inner/outer rings), suitable for Cat 320D2/336D2 excavator swing gearboxes, 966M loader drive axles, C13 engine crankshaft ends, and 140M2 grader rear axle differentials. It is used to withstand heavy radial loads, accommodate axial displacement of shafts, and is suitable for medium- and high-speed, high-load, and impact conditions, ensuring stable operation of the transmission system. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 569-4293, Double Row Cylindrical Roller Bearing (NN type, separable inner/outer rings), suitable for Cat 320D2/336D2 excavator swing gearbox, 966M loader drive axle, C13 engine crankshaft end, 140M2 grader rear axle differential, material is chromium-molybdenum alloy steel (inner and outer rings + rollers), cage is brass machined (with lubrication grooves), operating temperature -40℃ to +120℃, single weight approximately 2.1 kg, used to bear heavy radial loads, adapt to shaft axial displacement, suitable for medium and high speed, high load and impact conditions, prevent shaft wear and jamming, and ensure stable operation of the transmission system

Key Dimensions
Inner diameter 88.90 mm (3.5 inches, tolerance 0/-0.015 mm), outer diameter 152.40 mm (6 inches), total width 50.80 mm (2 inches), roller diameter 16.67 mm, cage pitch circle diameter 120.65 mm, radial clearance C3 (0.12-0.18 mm), inner ring to shaft fit tolerance h7 (0/-0.015 mm), outer ring to bearing housing fit tolerance H8 (+0.039/0 mm), minimum chamfer at both ends 1.5 mm, journal fillet radius ≤1.5 mm. Compatible models: Cat 320D2/336D2 excavators (slewing gearbox, stick cylinder pin), 966M/950M loaders (drive axle, gearbox output shaft), C13 engine (crankshaft end, balance shaft), 140M2 grader (rear axle differential, steering knuckle). Assembly fit: Inner ring to shaft interference fit (interference 0.012-0.020 mm), outer ring to bearing housing clearance fit (clearance). (0.010-0.020 mm), suitable for shafts with a diameter of 88.9 mm, inner hole and shaft fit tolerance h7 (0/-0.015 mm), coaxiality ≤0.02 mm, allowable bidirectional axial displacement of the shaft system ≤0.5 mm.

Installation and Maintenance Points:
Before installation, clean the inner and outer rings of the bearing, the journal, and the bearing housing bore. Check for scratches, rust, and cracks. Measure the dimensions of the journal and bearing housing bore to ensure the fit meets requirements. The journal fillet radius should be ≤1.5 mm to avoid stress concentration.

Use the heating installation method (oil temperature 80-90℃, do not exceed 100℃). After the inner ring expands, smoothly slide it onto the journal. After natural cooling, check the tightness of the fit. Use a pressure block to smoothly press the outer ring into the bearing housing. Do not directly strike the outer ring to prevent damage to the rollers and raceways. After installation, adjust the axial clearance to 0.05-0.10 mm.

Lubrication and maintenance: Grease lubrication should fill 30-50% of the bearing’s internal space (Cat Moly Grease is recommended). For oil lubrication, ensure a stable oil level. Check the bearing temperature, vibration, and clearance every 800 hours. Replace the bearing immediately if the temperature exceeds ambient temperature +40℃, the vibration is abnormal, or the radial clearance exceeds 0.25 mm.