CAT 156-6969 BEARING-BALL

CAT 156-6969 is a commonly used single-row deep groove ball bearing from Caterpillar, suitable for high-speed, light-load components such as hydraulic pumps, motors, and slewing mechanisms in mini excavators and loaders. It reduces rotational friction and withstands radial loads. The following is precise technical and application information:

Core Technical Parameters
Item Details
Part Model: CAT 156-6969 (1566969) Single-row deep groove ball bearing, weight approximately 0.18 kg (0.40 lb), standard deep groove construction, with stamped metal dust covers on both sides (ZZ)

Core Materials: Inner and outer rings and balls (GCr15 bearing steel, hardness HRC 61-65, carburized layer depth 0.8-1.0 mm); cage (phenolic resin, suitable temperature -40℃ to +120℃); dust cover (Q235 carbon steel, galvanized surface)

Key Dimensions: Inner diameter 40 mm, outer diameter 68 mm, width 15 mm, ball diameter 7.144 mm, 10 balls, cage pitch circle diameter 54 mm, radial clearance (C3 group) 0.012-0.028 mm, compatible shoulder diameter 45 mm, bearing housing bore diameter 68 mm

Rated Parameters: Rated radial dynamic load 19.5 kN, rated radial static load 12.8 kN, limiting speed (grease lubrication) 8500 r/min, operating temperature -40℃ to +120℃, rated life (10⁶ rpm) 1200 hours, compatible grease NLGI 2 lithium-based grease

Suitable Operating Conditions: High-speed, light-load, smooth-running rotating parts; suitable for hydraulic oil and gear oil applications; dust and slight moisture resistant; not suitable for heavy impact and off-center loading conditions.

Compatible Models: CAT 303CR/304CR mini excavator (hydraulic pump input shaft), 903C loader (working device motor), 216B3 Skid Steer Loader (Swing Motor), 305.5E2 Excavator (Pilot Pump)

Accessories: Adaptor Shaft 156-6970, Bushing 5G-0811, Snap Ring 3G-1681, Bolt 106-7772 (M10×20), Grease Nipple 1U-8878

Core Functions and Structural Features:

Low Friction & High Efficiency: Deep groove raceway design results in a low coefficient of friction (0.001-0.005) for ball bearings, suitable for high-speed rotation and reducing power loss.

Radial Load Capacity: Primarily bears radial loads, suitable for hydraulic pumps, motors, and other applications where radial force is dominant, ensuring stable power transmission.

Dust Protection: Metal dust covers on both sides prevent dust and impurities from entering, reducing wear on the balls and raceways and extending service life.

Easy Installation: Standard size fits universal mounting bases; no special tools required, direct press-fit for quick on-site maintenance. Highly adaptable: Compatible with various greases, suitable for common temperature and media 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, dust cover damage, and raceway scratches.

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

After installation, check the radial clearance to ensure it is within the C3 group range. During trial operation, ensure there is no jamming or abnormal noise, and the temperature rise is ≤20℃.

Maintenance Recommendations: Check the bearing condition every 500 working hours. Replace the bearing immediately if abnormal noise, excessive temperature rise, or excessive clearance occurs.

Regularly replenish grease to maintain sufficient internal lubrication of the bearing and prevent dry friction from accelerating wear.