Name: ISO 8643:2024 — Earth-moving machinery — Hydraulic excavator and backhoe loader lowering control device — Requirements and tests
SKU: ISO 8643:2024
Price: 25 EUR
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Overview

ISO 8643:2024 specifies uniform requirements and test procedures for lowering control devices (also referred to in parts of the standard as lifting linkage control valves) fitted to the boom, intermediate boom and arm cylinders of hydraulic excavators and the backhoe equipment of backhoe loaders. The standard targets machines used for object handling and defines how lowering control devices must behave to control the rate of drop if a hydraulic line fails or ruptures. It applies to machines equipped with the manufacturer’s standard linkage length.

Key topics and requirements

Purpose: ensure controlled lowering of loads in the event of hydraulic line failure to reduce risk to people and machine stability.
Scope: devices fitted on lifting linkage cylinders of excavators and backhoe loaders used for object handling.
Automatic operation: the lowering control device must operate automatically while cylinders are pressurized, even with the machine/ignition switched off (Clause 4.1).
Safety and stability: device operation must not degrade normal machine response or compromise stability (Clause 4.2).
Installation durability: tubes and fittings connecting device and any parallel relief valve must have a minimum burst pressure of four times the working circuit pressure; hoses are not acceptable for those critical connections (Clause 4.5).
Leakage and performance limits:
- Internal leakage test: vertical drop rate ≤ 10 mm/s at 1.0 m test height (Table 1).
- Holding/raising tests: total vertical drop ≤ 100 mm in 10 s.
- Lowering test: increase in lowering speed shall be less than 100% of initial speed averaged over at least 2 s; total vertical drop ≤ 100 mm in 10 s.
- Signal line rupture: oil leakage ≤ 10 L/min per cylinder at 40–50 °C.
- Equalizing lines: for machines ≤ 40 t leakage

ISO 8643:2024 PDF

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