Earth-moving machinery - Safety - Part 5: Requirements for hydraulic excavators
1Key Takeaways
EN 474-5 Earth-moving machinery — Safety — Part 5: Requirements for hydraulic excavators This European Standard specifies the safety requirements for hydraulic excavators as defined in Clause 3, used in earth-moving operations. It deals with all significant hazards, hazardous situations and events relevant to hydraulic…
2Expert Interpretation
The German standard DIN EN 474-5:2001 comprehensively regulates the safety technical requirements for hydraulic excavators, covering key safety elements such as operating space, swing braking, stability control, and noise limits, providing standardized safety guidance for the manufacture and use of hydraulic excavators.
Technical Interpretation of EN 474-5 Hydraulic Excavator Safety Standard
EN 474-5:2001, as an important part of the European earthmoving machinery safety standard series, specifically specifies the safety technical requirements for hydraulic excavators. This draft standard was published in October 2001, aiming to replace the 1996 version and reflecting the latest developments in hydraulic excavator safety technology.
Scope and Classification Definitions
This standard applies to wheeled and tracked hydraulic excavators as defined in EN ISO 6165:1999, and includes additional requirements for related types of machinery.
Scope and Classification Definitions
This standard applies to wheeled and tracked hydraulic excavators as defined in EN ISO 6165:1999, and includes additional requirements for related types of machinery.
The standard explicitly covers the following three categories of special equipment:| Equipment Type | Definition Characteristics | Operating Weight Limits |
|---|---|---|
| Minimum Turning Radius Excavator (MSRX) | Turning radius not exceeding 120% of undercarriage width | No specific limit |
| Compact Excavator | Operating weight ≤6000kg | ≤6000kg |
| Walking Excavator | 3 or more foldable or telescopic outriggers | No specific limit |
The standard excludes the applicability of bucket wheel excavators, focusing on conventional Type of Protection Applicable Equipment Standard Basis Special Provisions Front Protection Structure (FOPS) All Hydraulic Excavators ISO 10262:1998 Compact Excavators with Optional Front Protection Tilting Protection Structure (TOPS) Compact Excavators with Cab ISO 12117:1997 Mandatory Requirements Falling Object Protection Structure Walking Excavators EN 13510:2000 Category II Requirements Technical Requirements for Slewing Brake System
Appendix C provides detailed technical specifications for the slewing brake system of hydraulic excavators:
The slewing operating brake must be able to bring the machine to a complete stop at the rated slewing speed, and the braking delay must not exceed 20% of the allowable value in ten consecutive tests. Test conditions require the machine to be on level ground (±1% tolerance), with the working device fully extended and the backhoe bucket open without load.
The slewing parking brake must be able to maintain the upper position under the maximum torque of the slewing motor. For equipment with an operating weight >6000kg, a purely mechanical braking method (such as a spring accumulator brake) must be used.
Stability Control and Lifting Operation Safety
Stability Calculation Basis
Standard 5.5 specifies the stability requirements for hydraulic excavators under various operating conditions:
- The equipment must be located on level, solid ground
- Load mass, density, and center of gravity position must be considered
- The mass of the equipment and quick-connect devices must be taken into account
Lifting Operation Safety Devices
For hydraulic excavators with a lifting capacity exceeding 1000 kg or a tilting moment > 40,000 Nm, the following must be equipped:
| Safety Devices | Functional Requirements | Operating Conditions |
|---|---|---|
| Audible and Visual Alarm Device | Continuous Overload Alarm | Mandatory Activation During Lifting Operations |
| Boom and Hydraulic Pipe Explosion-Proof Device | Compliant with ISO 8643:1997 | Always Effective |
Appendix B provides detailed examples of lifting load representations, requiring manufacturers to provide clear load tables that are easily viewable from the operator's position.
Noise Control Technical Requirements
Standard 5.6 specifies the noise emissions of hydraulic excavators:
- Sound power levelMeasurement according to ISO 6395:1988 (including revision 1:1996)
- Operator position sound pressure levelMeasurement according to ISO 6394:1998
- Tests must be conducted under static conditions
This requirement reflects Europe's emphasis on noise pollution in the workplace, ensuring that operators work in an ergonomic environment.
Safety Requirements for Special Types of Equipment
Compact Tracked Excavators
Standard 5.7.1 makes special provisions for compact tracked excavators: the use of working devices (such as backhoe buckets) or auxiliary equipment (such as bulldozer blades) as parking devices is permitted, but the parking safety procedures must be detailed in the operation manual. ...>
Walking Excavators
Section 5.8 specifically addresses the special safety requirements for walking excavators:
- Outrigger hydraulic cylinders must be equipped with safety valves to prevent loss of stability in the event of hydraulic system failure
- Operators must have a clear view of the support plate from any outrigger position
- Safe evacuation routes must be provided in the event of power failure
Standard Implementation Recommendations and Technical Evolution
Main Differences from the 1996 Edition
Compared to the previous version of the standard, the 2001 edition mainly made the following improvements:
- Comprehensive revision of content and modernization of technical requirements
- Updated timeliness of referenced standards
- General requirements transferred to EN 474 series Part 1
- Added specific provisions for new equipment (such as compact, walking excavators)
Compliance Implementation Recommendations
Manufacturers should design and manufacture ... When operating hydraulic excavators, the following should be emphasized: Design and test the swing brake system strictly according to the requirements of Appendix C; provide appropriate protection options for different risk conditions; ensure the accuracy and readability of the lifting load table; and detail safety measures for special operating conditions in the operator's manual. This standard, as a Class C standard, has priority of application to machines designed and manufactured according to this standard when its provisions differ from those of Class A or Class B standards. The implementation of EN 474-5:2001 will significantly improve the overall safety level of hydraulic excavators, providing operators with a safer working environment, while promoting technological standardization and product quality improvement in the European earthmoving machinery market.