左侧较大的紧固螺母松动，需要修理或更换。
The large securing nuts on the left side are loose and need to be repaired or replaced.
养护时首先应查看轮胎气压、磨损状况，螺母有无松动或掉落，除去双胎间或胎面上的嵌入物及铁钉等尖利杂物。
Maintenance should first check the tire pressure, wear, nut loose or fall off, remove the twins or tread on the inserts and nails and other sharp objects.
可能受到振动、波动载荷、冲击载荷或动力载荷的内部螺栓应加以保护防止松动。可采用双螺母、防松动垫圈、点焊等。
Internal bolts subject to vibration, fluctuating load, impact load or dynamic load shall be protected against loosening. Double nuts, unti-loose washers, tack welding, etc. shall be used.
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