ISO 20474-7:2017

Overview

ISO 20474-7:2017 - "Earth-moving machinery - Safety - Part 7: Requirements for scrapers" defines safety requirements specific to wheeled scrapers and crawler scrapers (excluding towed scrapers). It is a type-C standard intended to be used together with ISO 20474-1 (general safety requirements). The document addresses significant hazards during commissioning, operation and maintenance and specifies technical measures to eliminate or reduce risk for machines built from its publication date onward.

Key topics and technical requirements

• Scope and precedence: Specific scraper requirements in ISO 20474-7 take precedence over the general requirements in ISO 20474-1 where they differ.
• Operator’s seat: For scrapers without axle or frame suspension, seats must meet spectral class EM 2 as specified in ISO 7096 (operator seat vibration).
• Retarder systems: If a retarder is fitted, it must meet the performance requirements of ISO 10268.
• Articulated frame lock: The general clause on articulated frame lock in ISO 20474-1 is not applicable to scrapers under this part.
• Towing devices: Requirements apply with clarification that some attachment points used only to assist loading are not considered towing devices.
• Noise measurement: Sound power and operator-station emission levels must be measured according to ISO 6393 and ISO 6394, respectively, consistent with ISO 20474-1 noise clauses.
• Access to engine compartment: Access provisions differ for the rear engine of self-propelled scrapers; certain general clauses are excluded.
• Information for use: Operator and maintenance documentation must include specific instructions (e.g., push-blades, elevator and auger use and maintenance).
• Hazard coverage: The standard addresses foreseeable misuse and all relevant hazardous situations listed in ISO 20474-1 Annex A.

Applications and who uses it

ISO 20474-7:2017 is used by:

• Manufacturers and designers of wheeled and crawler scrapers to design compliant machines and incorporate required safety features.
• Safety engineers and compliance officers to assess risk and verify conformity with international safety expectations.
• Test laboratories and certification bodies that measure noise, vibration and retarder performance.
• Fleet managers and construction contractors selecting equipment and verifying operator information and maintenance procedures. The standard helps reduce injury risk, support regulatory compliance, and provide clear technical benchmarks for procurement and testing.

Related standards

• ISO 20474-1 (General safety requirements)
• ISO 6165 (Types, terms and definitions for earth-moving machinery)
• ISO 7096 (Operator seat vibration)
• ISO 10268 (Retarder performance)
• ISO 6393 / ISO 6394 (Noise measurement)
• ISO 7133 (Scraper terminology)

Keywords: ISO 20474-7, scrapers, earth-moving machinery safety, wheeled scrapers, crawler scrapers, safety requirements, operator seat, noise levels, retarder, towing device, ISO 20474-1.