CAT 328-5239 BUSHING

CAT 328-5239 (3285239) is a Caterpillar original straight-tube heavy-duty bushing used in the connecting rod, rocker arm, or pivot joints of loaders, bulldozers, and other equipment. It bears radial heavy loads and achieves stable rotation. It is compatible with models such as 950M/966M loaders and D6T/D6N bulldozers. It is a key wear-resistant part Cat® that ensures the flexibility and durability of the working device’s articulation. The following are the core information and key points:

Core Technical Parameters

Item Details
Part Model: CAT 328-5239 (3285239) Straight Cylindrical Bushing, suitable for rotating support scenarios of pins and bearing seats, original factory single-piece supply

Material: Steel back + copper-lead alloy bimetallic structure, steel back 4140 chromium-molybdenum steel, alloy layer thickness 0.3-0.5mm, surface contains solid lubricating particles; some versions integrate NBR sealing layer, oil-resistant, wear-resistant, suitable for heavy-duty conditions

Key Dimensions: Inner diameter 85mm, outer diameter 105mm, length 65mm, wall thickness 10mm, 3×45° chamfers at both ends; lubrication groove width 3mm, depth 1.5mm, 4 evenly distributed M8 oil filling holes; mounting hole tolerance H7, suitable pin tolerance g6

Compatible Models: CAT 950M, 966M, 972M Loader, D6T, D6N, D7E bulldozers, for use in articulated parts such as boom, stick, and rocker arm. Compatible pin models 328-5238, compatible bearing housing models 328-5240.

Performance Parameters: Rated radial load 180kN, allowable linear velocity ≤1.8m/s, operating temperature -30℃ to 120℃, wear life ≥7000 hours, can withstand short-term impact load ≤250kN, compatible with lithium-based grease (NLGI 2).

Core Functions and Structure:
Heavy-duty radial support: Bimetallic layer design provides stable support for the pin under high loads, dispersing contact stress, suitable for frequent start-stop and impact conditions in construction machinery, preventing localized wear between the pin and bearing housing.

Self-lubricating and wear-resistant: The alloy layer contains solid lubricating particles, forming a temporary lubricating film during oilless start-up. Combined with lubrication grooves and oil injection holes, it ensures long-term sufficient lubrication, reduces the coefficient of friction, and extends component life (Cat®…).

Precise Positioning and Guiding: The straight cylindrical structure and strict dimensional tolerances ensure coaxiality between the pin and the bearing housing, preventing jamming and abnormal wear caused by off-center loading, and guaranteeing flexible movement of the hinged parts (Cat®…).

Pressure-fitting and Stable Fixing: The pressure-fitting method ensures a secure connection to the bearing housing, resisting vibration and impact, maintaining stable installation position, and reducing the risk of loosening (Cat®…).