CAT 526-9334 General Duty Sleeve Bearing

CAT 526-9334 is a Caterpillar standard load radial sleeve bearing, suitable for connecting rod pins, shaft pins or drive shaft support parts of Cat 320/323 excavators, 966K/972K loaders, D6T bulldozers and other models. It is used to bear radial loads and reduce friction. It is a key wear-resistant component of transmission and working device, suitable for medium load and low speed conditions, and balances cost and durability. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 526-9334, Type: Conventional Load Radial Sleeve Bearing (Busket), Material: Low Carbon Steel Matrix + Sintered Bronze Layer + PTFE Self-Lubricating Layer (Thickness 0.2 mm), Single Weight: Approx. 0.85 kg, Suitable Temperature: -30℃ to +120℃, Lubrication Method: Self-Lubricating + Oil Bath Assisted (Compatible with SAE 10W-30/15W-40 Machine Oil), Protection Rating: IP54 (Dustproof/Splashproof)

Key Dimensions
Inner Diameter: 65 mm (Tolerance H7), Outer Diameter: 80 mm (Tolerance g6), Length: 100 mm (Tolerance ±0.1 mm), Wall Thickness: 7.5 mm, Chamfer: 1×45°, Locating Groove Width: 5 mm, Depth: 2 mm, Suitable Shaft Diameter: 65 mm (Tolerance f7), Installation Clearance: 0.05-0.12 mm mm
Compatible Models and Applications: Compatible with Cat 320 excavator boom linkage pin, 323 excavator stick pin, 966K loader steering tie rod pin, and D6T bulldozer idler wheel axle. Mounted in the linkage/bracket pin hole, one piece per location, providing radial support and friction reduction.

Performance Parameters: Rated radial load 120 kN (static) / 80 kN (dynamic), limiting speed 1200 rpm, coefficient of friction ≤0.08 (dry friction) / ≤0.05 (oil lubrication), bronze layer hardness HB80-100, steel substrate tensile strength ≥450 MPa, wear life ≥5000 hours (medium load conditions)

Structural and Performance Advantages: Composite layer wear-resistant design: Low-carbon steel substrate ensures structural strength, intermediate sintered bronze layer enhances load-bearing capacity and thermal conductivity, and surface PTFE… The self-lubricating layer reduces the coefficient of friction, making it suitable for oil-free or low-oil operating conditions, reducing wear on pins and bearings, and extending component lifespan.

Suitable for normal loads: Rated dynamic/static radial loads match medium-load conditions such as excavators and loaders, preventing overload deformation. It also adapts to low to medium speeds (≤1200 rpm), meeting the operational requirements of pins and drive shafts in working devices.

Precise installation and positioning: The positioning groove design facilitates quick centering during installation, preventing circumferential rotation of bearings; precise inner and outer diameter tolerances and chamfer design reduce installation difficulty, ensuring accurate fit with pins and pin holes, and reducing impact wear caused by excessive clearance.

Self-lubricating and maintenance-free: The PTFE surface layer enables low-resistance operation under dry friction conditions, reducing reliance on external lubrication and lowering maintenance frequency; when used with oil bath-assisted lubrication, the coefficient of friction is further reduced, improving wear resistance.

Installation and Maintenance Points
**Before installation, clean the pin hole and pin shaft surfaces, and check for cracks, deformation, and PTFE layer peeling in the bearing. Use the cold pressing method for installation (use specialized tooling to avoid directly striking the bearing end face), ensuring the bearing end face is flush with the pin hole end face. After installation, check for smooth rotation without jamming, and that the clearance meets the requirement of 0.05-0.12 mm.**

Every 1500 hours of maintenance: Check the wear of the bearing and pin shaft (replace when radial wear > 0.2 mm), clean oil stains from the bearing surface, and replenish grease (NLGI 2 lithium-based grease, suitable temperature -20℃ to +120℃). Check for looseness in the locating groove to prevent circumferential displacement of the bearing.

Prioritize original parts. Aftermarket parts may have issues such as weak composite layer bonding, out-of-tolerance dimensional tolerances, and poor PTFE layer wear resistance, easily leading to premature wear, pin shaft scratches, excessive component clearance, abnormal noise, and affecting the normal operation of the device.