Used in WA420-1 and WA400-1 construction machinery models, the critical power train component numbered 424-15-12331 ensures torque transmission and gear group balance within the transmission. When replacing this carrier unit, which is exposed to high loads during operation, the part code must be exactly matched with your machine's chassis and transmission tag as 4241512331.
During wear or gear backlash checks, inspecting the mounting holes on the body, shaft mating surfaces, and flange structure directly protects the lifespan of the drivetrain. If you are unsure about the correct part fit for your machine, you can verify using the serial number and part information on your existing transmission label.
