9R0170 Bushing On Boom to Dipper Fits CAT 416B, 416C, 416D, 420D, 430DOne New Aftermarket Replacement Bushing Fits Caterpillar (Fits CAT) Backhoe Loaders This bushing installs at the boom to dipper pivot point on Fits Caterpillar backhoe loaders, serving as a sleeve bearing at the critical connection between the boom and dipper stick. It absorbs pivot loads and reduces metal to metal wear at this high stress articulation point, helping maintain smooth dipper stick movement and extending service life of the surrounding