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See Chinese contents: GB/T 21958-2017 GB/T 21958-2017: Wheeled tractor -- Front drive axle
This standard specifies the model compilation, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage of front drive axles of wheeled tractors. This standard applies to the front drive axle of four-wheel drive tractors (hereinafter referred to as the front drive axle).
