BS ISO 8643 2017 pdf free download.Earth-moving machinery — Hydraulic excavator and backhoe loader lowering control device — Requirements and tests
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.
2 Normative references
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 — Basic types — Identification and terms and definitions
ISO 9248:1992, Earth-moving machinery — Units for dimensions, performance and capacities, and their measurement accuracies
3 Terms and definitions
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:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1 linkage control system
hydraulic control components (including pilot and slave valves) used for raising and lowering the lift point in object handling applications
3.2 lifting linkage
assembly of parts that can be a combination of booms and arms used for raising and lowering the lift point in the object handling process
3.3 lowering control device
hydraulic control valves used for controlled linkage lowering in the case of a hydraulic line failure or rupture
3.4failure-simulation device
hydraulic valves used for simulating a failure or rupture in a hydraulic line in the linkage control system
3.5 signal line
hydraulic circuit that is used to sense a pressure
EXAMPLE Diagnostic test port, stability limit system.
3.6 rated lift capacity
smaller of either the rated tipping capacity or the rated hydraulic lift capacity
[SOURCE: ISO 10567:2007, 3.13]
3.7 lift point
LP location on the attachment (e.g. bucket) or the quick coupler, as specified by the manufacturer, to which
a load can be attached
[SOURCE: ISO 10567:2007, 3.2, modified]
3.8 lift point radius
LPR horizontal distance from the axis of rotation to the vertical hoist line or tackle
[SOURCE: ISO 10567:2007, 3.5]
3.9 object handling
application of earth-moving machinery comprising lifting, lowering and transporting of a load by use of lifting accessories, whereby the assistance of a person or the operator of the machine is required for hooking, unhooking or stabilizing (whilst transporting) the load
Note 1 to entry: If the load is picked-up by a self-acting device and no assistance of a person is required for hooking, unhooking or stabilizing the load, this work is considered as a usual earth-moving application.
Note 2 to entry: Lifting accessories are, e.g. wire ropes, chains or textile straps; loads in object handling application are, e.g. pipes, vessels; self-acting devices are, e.g. grabs, clamshell buckets, log clamps, vacuum lifting device, magnetic plate or fork.
4 Lowering control device requirements
4.1 Lowering control devices shall comply with the requirements given in 4.1.1 to 4.1.8.
4.1.1 The lowering control device shall operate automatically while the cylinders in the linkage control system that keep the load in a lifted position are pressurized, even if the machine/ignition is switched off.
4.1.2 The operation of the lowering control device shall not detract from the normal response of the machine during use and shall not at any time endanger the stability of the machine.
4.1.3 A relief valve to protect the cylinder may be fitted between the cylinder and the lowering control device.
4.1.4 In the case of a failure in the linkage control system, lowering the load shall be possible without endangering persons or the stability of the machine.BS ISO 8643 pdf download