CAT 4J-3362 25.4mm Roller Bearing

CAT 4J-3362 is a Caterpillar small radial sliding bearing (sleeve) that is suitable for actuator housings, connecting rod pins, or hydraulic cylinder trunnions of Cat 320/323 excavators, 966K loaders, and other models. It is used to bear light to medium radial loads and reduce friction. It is a key small-sized bearing component that ensures the coaxiality of components and prevents jamming, and is suitable for low-speed and medium-load conditions. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 4J-3362, Type: Radial sliding bearing (shoulder sleeve), Material: Low carbon steel base + bronze layer + PTFE self-lubricating layer (thickness 0.15 mm), Single weight: Approximately 0.08 kg, Suitable temperature: -25℃ to +110℃, Lubrication method: Self-lubricating + oil mist assisted, Protection level: IP54, No locating groove design

Key Dimensions
Inner diameter: 25 mm (tolerance H7), Outer diameter: 32 mm (tolerance g6), Length: 30 mm (tolerance ±0.1 mm), Wall thickness: 3.5 mm, Chamfer: 0.5×45°, Suitable shaft diameter: 25 mm (tolerance f7), Installation clearance: 0.03-0.08 mm

Compatible Models and Parts
Compatible with Cat 320 excavator boom cylinder trunnion, 323 excavator boom connecting rod pin, 966K Loader steering actuator housing, mounted on the trunnion/pin hole, one piece per location, providing radial support and reduced friction.

Performance Parameters: Rated radial load 35 kN (static) / 22 kN (dynamic), limiting speed 1500 rpm, coefficient of friction ≤0.07 (dry friction) / ≤0.04 (oil lubrication), bronze layer hardness HB75-95, steel substrate tensile strength ≥420 MPa.

Structural and Performance Advantages:
Composite layer self-lubricating: The PTFE surface layer is suitable for oil-free/low-oil conditions, reducing pin and bearing wear and extending component life; the bronze layer enhances thermal conductivity and load-bearing capacity, and the steel substrate ensures structural strength.

Small size, high precision: Compact size adapts to narrow installation spaces; precise tolerances ensure accurate fit with the shaft/hole, avoiding vibration caused by excessive clearance or jamming caused by insufficient clearance.

Highly adaptable: Compatible with actuators, connecting rods, cylinders, and other components in various small and medium-sized Cat machines, offering high versatility and easy installation without the need for complex tooling.

Installation and Maintenance Points: Before installation, clean the pin holes and pin shafts, checking for bearing cracks and PTFE layer peeling. Install using the cold pressing method (using specialized tooling to press in, avoiding impact), ensuring the end faces are flush. After installation, ensure smooth rotation with a clearance of 0.03-0.08 mm.

Maintenance every 2000 hours: Check bearing wear (replace when radial wear > 0.1 mm), clean surface oil, replenish NLGI 2 lithium-based grease, check fit clearance, and replace if necessary.

Prioritize genuine parts. Aftermarket parts may have inferior materials and out-of-tolerance issues, easily leading to premature wear, pin shaft scratches, and affecting the normal operation of components.