(1) Check whether all gears, shafts, splines and spiral parts have cracks, notches, dents, pit corrosion or excessive abrasion.
(2) Check whether the left and right differential housings and the cross shaft have uneven abrasion, cracks, notches, dents or distortion. Check whether the bevel gear spacer and the half axle gear spacer have abrasion, and measure the internal and external clearance of the spacer. When the clearance difference is larger than 0.13 mm, the spacer shall be replaced. It is recommended that all spacers should be replaced simultaneously so as to adjust the meshing clearance of each gear pair to be consistent.
(3) Check whether the bracket of the main drive, the bearing sleeve and the matching hole of the wheel planetary carrier have cracks, notches, dents or excessive abrasion. Replace them when necessary.
(4) Check whether all the bearings are burnt, decorticated, pitted, broken off, depressed, or inflexibly rotate, the isolating carrier is damaged, and the bearings have abnormal noise. Replace them if necessary. Check whether the roller pin in the wheel planetary speed reducing mechanism is abraded or damaged.
(5) Check whether the planetary spacers on the two end surfaces of the planetary gear in the wheel planetary speed reducing mechanism are flat without burrs, cracks, notches or scratches. Replace them when necessary.