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Chinese Standard: GB/T 21938-2008

Earth-moving machinery—Hydraulic excavator and backhoe loader boom-lowering control device—Requirements and tests

IDT  ISO 8643:1997

全国土方机械标准化技术委员会(SAC/TC 334)

本标准规定了动臂下降控制装置的性能要求和试验方法,该装置安装在动臂提升液压缸上,用于在
液压管路发生故障或破裂时控制动臂的下降速度。
本标准适用于液压挖掘机和挖掘装载机的反铲装置搬运和提升物料作业时的动臂下降控制装置。

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