GB/T 21938-2008 Replaced National standards

GB/T 21938-2008 Earth-moving machinery—Hydraulic excavator and backhoe loader boom-lowering control device—Requirements and tests

GB/T 21938-2008 Earth-moving machinery—Hydraulic excavator and backhoe loader boom-lowering control device—Requirements and tests

Publish Date: 2008-06-03 Implement Date: 2009-01-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 21938-2008

Standard Type: National standards

Standard Status: Replaced

is_force_gb: no

CCS Name: Construction engineering construction machinery

ICS Name: Earthmoving machinery

Publish Date: 2008-06-03

Implement Date: 2009-01-01

Pages: 7 pages

Scope

This standard specifies the performance requirements and test methods for the boom descent control device, which is installed on the boom lift hydraulic cylinder and used to control the descent speed of the boom when the hydraulic pipeline fails or ruptures. This standard applies to the boom descent control device used in the loading and lifting operations of the reverse shovel device of hydraulic excavators and excavator loaders.

Development Information

Word Count: 8 Thousand words Pages: 7 pages

Replace the following standards

JG/T 5084-1996 Hydraulic excavator and backhoe loader boom lowering control device—Requirements and tests

Superseded by the following standards

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

Referenced Standards

GB/T 8498-1999 Earth-moving machinery—Basic types—Vocabulary GB/T 8498-2008 Earth-moving machinery—Basic type—Identification and terms and definitions GB/T 8498-2017 Earth-moving machinery—Basic types—Identification and terms and definitions GB/T 8498-2025 Earth-moving machinery—Basic types—Identification and vocabulary

Adopt standards

ISO 8643:1997

Related Standards

GB/T 6375-1986 Replaced

GB/T 6375-1986 Earth-moving machinery—Method of test for the measurement of draw-bar pull

Publish Date: 1986-05-13

GB/T 6572.2-1986 Replaced

GB/T 6572.2-1986 Excavators terminology—Cable operated type

Publish Date: 1986-07-22

GB/T 13331-1991 Replaced

GB/T 13331-1991 Hydraulic excavators—Methods of measuring lift capacity

Publish Date: 1991-12-16

GB/T 13332-1991 Replaced

GB/T 13332-1991 Hydraulic excavators—Methods of measuring tool forces

Publish Date: 1991-12-16

GB/T 14289-1993 Active

GB/T 14289-1993 Earth-moving machinery—Diagnostic ports

Publish Date: 1993-04-17

GB/T 14780-1993 Replaced

GB/T 14780-1993 Earth-moving machinery—Drain, fill and level plugs

Publish Date: 1993-12-27