CAT 328-5241 BUSHING

CAT 328-5241 is a Caterpillar steel retaining bushing used in the articulation points of the boom, stick, or bucket. It is fitted to the joints of excavators, loaders, and other equipment to support pins, transmit loads, and reduce friction. The following is information on its structured technology and applications.

Core Technical Parameters

Item Details
Basic Attributes Model 328-5241, Type: Steel Fixed Bushing (without oil groove), Material: 40Cr Alloy Steel (tempered + surface hardened), Single Weight: Approx. 1.8 kg, Suitable Temperature: -30℃ to +120℃, Suitable Working Conditions: Low-speed oscillation, heavy-load radial force, no axial compensation capability

Key Dimensions Inner Diameter: 60 mm, Outer Diameter: 85 mm, Length: 70 mm, Chamfer: R2 mm, Inner Diameter Tolerance: H7, Outer Diameter Tolerance: r6, Surface Roughness: Ra≤0.8 μm, Cylindricity: ≤0.01 mm, Parallelism of Both End Faces: ≤0.015 mm, Interference: 0.04-0.07 mm

Compatible Models and Parts Compatible with Cat 320GC/323GC excavator boom and stick hinge point, 966M loader bucket linkage pin, 140M… Grader blade connecting pins, 2-4 pieces per machine, suitable for radial loads ≤180 kN and oscillation frequency ≤10 times/minute.

Performance Parameters: Allowable radial load ≥180 kN, static load capacity ≥250 kN, coefficient of friction ≤0.002 (grease lubrication), hardness HRC 58-62, recommended Cat 2C-9000 lithium-based grease, lubrication method is periodic refilling (once every 50 hours), sealing type is dust ring seal.

Structural and Performance Advantages:

Integral steel structure: 40Cr alloy steel, tempered and surface hardened, possessing both high hardness and toughness, suitable for heavy-load and impact conditions in engineering machinery, extending service life.

Oil-free design: Suitable for low-speed oscillation conditions; periodic grease refilling is sufficient for lubrication needs; simple structure, convenient maintenance.

Interference fit installation: Outer diameter tolerance r6, forming an interference fit with the mounting hole, ensuring no loosening after bushing installation and stable load transmission.

Standardized Compatibility: Compatible with hinge parts of various Caterpillar equipment, offering high versatility. Replacement requires no adjustment of the mounting structure, reducing maintenance costs.

Installation and Maintenance Points: Before installation, clean the pin and mounting hole, removing burrs and oil. Inspect the inner and outer surfaces of the bushing for scratches and deformation. Use a pressing tool to evenly press the bushing into the mounting hole, applying a pressure ≤80 kN. After installation, ensure the bushing fits tightly against the hole wall without gaps.

Maintenance Cycle: Add grease every 50 hours, approximately 5-8 g each time. Check bushing wear every 2000 hours. If the inner diameter wear exceeds 0.12 mm, or if cracks, deformation, or other defects appear, replace immediately.

Disassembly Method: Use a puller to remove the bushing. Do not strike to avoid damaging the pin and bushing.