Caterpillar 3G-6537 is a piston wear ring with a 152.4 mm (6.0 in) outer diameter, cataloged as CAT 3G6537 for Caterpillar engines. It is listed as compatible with engines including AD22, AD30, 966C, 966R, 651E, 657E, R1300, and R1300G. As a wear ring, it sits in the piston assembly to help control wear and maintain piston alignment during engine operation.
