419-22-11421 (4192211421) pinion differential spider gear is designed to balance torque transmission in heavy machinery powertrain systems. It is fully compatible with Komatsu WA320-1, WA320-3, WA320-5, WA320-6, WA320-7, and WA320-8 series loader models. In axle housings operating under severe field conditions, precise matching of gear backlash and tooth profiles is one of the critical factors directly affecting transmission efficiency.
Differential Gear Installation and Replacement Notes
During the replacement process, completely cleaning the residue and old oil inside the housing extends the lifespan of the new gear. At the installation stage, it is necessary to adjust the gear backlash ratios according to factory values and check the spider needle bearings. Gears installed with incorrect torque or used with worn bearings may experience a loss of strength in a short time.
Compatibility and Part Verification
Before ordering, comparing the original part numbers on the removed part with your machine serial number is the most reliable method. You can inform us if you are unsure about which serial-numbered WA320 loader transmission and differential assembly you have.
