Caterpillar Inc. 1P-4110 Friction Disc Assembly

The CAT 1P-4110 friction disc is a 5.56 mm-thick, hardened-steel friction disc with a full waffle groove pattern, designed as a special-fit component for Caterpillar planetary transmissions. The part number 1P-4110 (also listed as 1P4110) identifies this disc as the friction element used within Cat planetary gear sets to transfer torque and control engagement in heavy-drive transmissions. Cat catalogs and aftermarket listings describe its compatibility with a range of Cat planetary drive assemblies, reflecting its role as a standard replacement part in many CAT machines. When replaced, it supports restored torque transfer and even wear characteristics in the friction surface, leveraging hardened steel construction and the waffle-groove geometry to maintain engagement under load.