Base bearings establish the foundation to cylinder base connection using one of our standard pins. The base bearing will mate to its matching cylinder base relative to the size of the main barrel. Standard bases include a replaceable bronze C954 bushing, but can be purchased without. Pivot bearings come in 6 and 8 bolt configurations and root the main truck dumper platform to the foundation at the dumper pivot. This is a critical connection and routine lubrication, inspection, and replacement is crucial. Many configurations are available to match the installation and all standard models are kept in stock.