84172816 Seal Kit Fits CaseOne New Aftermarket Replacement Hydraulic Swing Cylinder Seal Kit Fits Case Backhoe Loaders This aftermarket replacement hydraulic seal kit restores the swing cylinder on Fits Case backhoe loaders, stopping fluid leaks and returning full hydraulic performance. The swing cylinder controls side to side boom movement, and worn or damaged seals are a common cause of slow, spongy, or drifting swing action. Rebuilding with a fresh seal kit is a cost