1. Ensure the safety of the demolition area and prepare appropriate tools and equipment.

2. Lift the tractor to a proper height and unload the wheels related to the differential. First, remove the small gland with an Allen wrench, remove the bearing circlip on the pulley seat, pull the pulley down with a spatula, remove the pulley seat, remove the left end cover of the differential with an Allen wrench, take out the first-stage planetary carrier with a crowbar, then remove the first-and second-stage differential housings, the right-end cover, and take out the third-stage planetary carrier and the second-stage planetary carrier.

3. Disassemble the first, second and third planetary carriers respectively, and clean and check all gears, bearings and inner sleeves of the planetary carriers. The surface should be kept free of abrasion and the bearing clearance should be kept within a fixed range. If it is worn, it must be replaced.