GB/T 21938-2021 Active National standards

GB/T 21938-2021 Earth-moving machinery—Hydraulic excavator and backhoe loader lowering control device—Requirements and tests

Publish Date: 2021-12-31 Implement Date: 2022-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 21938-2021

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Construction engineering construction machinery

ICS Name: Earthmoving machinery

Publish Date: 2021-12-31

Implement Date: 2022-07-01

Pages: 13 pages

Scope

This document specifies the performance requirements and test methods for the lowering control device, which is installed on the boom, intermediate boom, and bucket arm hydraulic cylinders of hydraulic excavators and excavator-loaders, and is used to control the lowering speed of the boom when the hydraulic pipeline fails or ruptures.
This document applies to the lowering control device (installed with the standard linkage mechanism specified by the manufacturer) used in the lifting operation of the reverse digging device of hydraulic excavators and excavator-loaders. On machines that provide alternative linkage mechanisms, only the standard length specified by the manufacturer is tested.