CAT 165-4423 Straight Sleeve Bearing

CAT 165-4423 is a Caterpillar steel-backed aluminum-coated straight sleeve bearing (without flange), suitable for the joint pins and bushings of Cat 320/323 excavators, 966K loaders, and other models. It is used for sliding support under low to medium speed and medium load, reducing wear on the pins and seat bores. It is a key wear-resistant component of the working device and transmission system, Cat® Parts. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 165-4423, Type: Straight flangeless sleeve bearing (shoulder sleeve), Material: Steel-backed aluminum layer (steel backing Q235 + aluminum-based alloy wear-resistant layer, containing solid lubricant), Single weight: Approximately 0.25 kg, Suitable temperature: -30℃ to +120℃, Installation method: Press-fit, No oil groove/oil hole (relies on pin lubrication)

Key Dimensions
Inner diameter: 50 mm (tolerance H7, 50.00-50.03 mm), Outer diameter: 56 mm (tolerance g6, 55.97-55.99 mm), Length: 40 mm (tolerance ±0.1 mm), Wall thickness: 3 mm, Press-fit interference: 0.02-0.04 mm

Applicable Models and Parts
Applicable to Cat 320 excavator boom pin bushing, 323 Excavator boom cylinder lug bushing, 966K loader steering knuckle pin bushing, 1 piece per pin, bearing radial load (maximum radial force ≤35 kN)

Performance Parameters: Rated radial load 35 kN, aluminum layer hardness HB80-100, steel backing tensile strength ≥450 MPa, coefficient of friction ≤0.15 (oil lubrication), wear-resistant layer thickness 0.5 mm, inner diameter shrinkage after press fitting ≤0.02 mm

Structural and Performance Advantages:

Wear Resistance and Friction Reduction: Steel backing aluminum layer structure, aluminum-based alloy containing solid lubricant, suitable for oil-free or thin oil lubrication conditions, reducing pin and seat hole wear, extending component life.

Stable Load Bearing: Steel backing provides rigid support, aluminum layer absorbs shock and vibration, suitable for frequent start-stop and load fluctuation conditions in construction machinery.

Easy Installation: Straight type without flange, press fitting completes installation, no additional fastening required, suitable for compact installation spaces.

Highly adaptable: Precisely matches original parts with pins and housings, ensuring stable operation of the working device and transmission system, and reducing maintenance frequency.

Installation and Maintenance Points: Before installation, clean the housing, pin, and sleeve bearing, checking for cracks and deformation; press the bearing into the housing using a press (interference allowance 0.02-0.04 mm), ensuring the end face is flush with the housing; do not strike the bearing body.

Maintenance every 2000 hours: Check the clearance between the bearing and pin (maximum allowable clearance 0.2 mm); replace immediately if it exceeds the tolerance; periodically add lithium-based grease (NLGI 2) to the pin, adding only a small amount each time.

Prioritize original parts. Aftermarket parts may have improper material ratios or insufficient dimensional accuracy, easily leading to premature wear, pin jamming, and component damage and malfunction.