Trolley need do daily maintain especially the trolley caster wheels.When trolley running outdoor and some other place where have textile,or lots of dust.The varia will easy to running to the wheel bearing portion.That’s will affect trolley’s normal operation. And do not clear it in time that’s will also shorten the trolley useful time.

So please check your trolley clear dust or textile regularly ,Or match a Anti winding cover on the wheels.Beside of this there need add lubricating oil on the swivel portion,like wheel bearing,and swivel ball house of wheel bracket.And the trolley wheel may also need add hear resistance oil if the trolleys are running on high temperature place.

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