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BS ISO 8643:2017 pdf free

BS ISO 8643:2017 pdf free.Earth-moving machinery – Hydraulic excavator and backhoe loader lowering control device
This document establishes uniform requirements and test procedures for lowering control devices fitted on the boom, intermediate boom and arm cylinders of hydraulic excavators and backhoe loaders to control the rate of drop in the case of a hydraulic line failure or rupture.
It is applicable to the lowering control devices of hydraulic excavators and the backhoe equipment of backhoe loaders used for object handling which are equipped with the standard linkage as defined by the manufacturer. On machines where alternative linkage combinations are offered, only the standard length defined by the manufacturer is subject to testing.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6165, Earth-moving machinery一Basic types一Identification and terms and definitions
ISO 9248:1992, Earth-moving machinery一Units for dimensions, performance and capacities, and their measurement accuracies
For the purposes of this document, the terms and definitions given in ISO 6165 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
一IEC Electropedia: available at http://www.electropedia.org/
一ISO Online browsing platform: available at http://www.iso.org/obp
The test load shall be positioned at a height so the test load does not come into contact with the ground surface during the test.
The test load shall be lowered smoothly and continuously without shock (see 5.3.1).
The failure-simulation device shall be opened. The following may be measured simultaneously or separately. If done separately, the initial lowering speed for both measurements shall be as specified in 5.3.1.
a) Without changing the position of the lowering control device, measure the increase in the lowering speed. The increase in the lowering speed of the test load shall be less than 100 % increase of the initial speed averaged over a period of at least2 s.
b) Measure the total drop of the load after the lowering control device is moved to the neutral position.The lowering control device shall be able to limit load movement so that the total drop of the load during the initial 10 s after moving the lowering control device to neutral shall not exceed 100 mm.BS ISO 8643 pdf download.

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