2812321 Seal Kit Fits Caterpillar ModelsOne New Aftermarket Replacement Boom Cylinder Seal Kit for Caterpillar (Cat) Mini Excavators This aftermarket replacement boom cylinder seal kit restores hydraulic cylinder sealing performance on Caterpillar (Cat) mini excavators. The kit services the boom hydraulic cylinder and includes wiper seals, U cup rod seals, and piston seals. Replaces OEM part number 2812321 (also formatted as 281 2321). Specifications Rod Diameter: 50 mm Bore Diameter: 85 mm
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