Used in WA420-1, WA380-3, WA380-6, WA380-5 and WA470-1 machines, the 421-22-11681 (4212211681) differential axle gear shim balances friction and load distribution in the drivetrain. Verifying catalog numbers during component replacements in heavy machinery transmission and differential systems is crucial for the compatible operation of differential gears and the prevention of wear. Before installing such shims, the axle and gear surfaces must be cleaned, and the tabs or holes must be aligned precisely.
Checking the condition of other shims and gear elements inside the differential during part replacement directly affects the service life of the drivetrain. You can check the part number to clarify the undercarriage compatibility of your heavy machine.
