Overview
EN ISO 3164:2013 - Earth-moving machinery - Laboratory evaluations of protective structures - Specifications for deflection-limiting volume (DLV). This CEN-adopted ISO standard defines the DLV geometry, placement and tolerances to be used when performing laboratory evaluations of operator protective structures (ROPS, TOPS, FOPS) for earth-moving machinery as defined in ISO 6165. It supports conformity assessment under the EU Machinery Directive (2006/42/EC) for relevant essential safety requirements.
Key topics and technical requirements
- Deflection-limiting volume (DLV): defined as an approximation of a large seated operator (per ISO 3411). Two primary forms:
- Orthogonal DLV (rectilinear approximation).
- Rounded DLV (orthogonal DLV with rounded corners to better represent head/shoulder curvature).
- Orthogonal top head plane (270 mm × 330 mm) used with the rounded DLV for FOPS testing.
- Dimensions and tolerances:
- All linear DLV dimensions (as shown in the figures) have a tolerance of ±5 mm.
- Locating accuracy relative to the Seat Index Point (SIP) is ±13 mm (horizontal and vertical).
- Rotation accuracy is ±1°.
- Positioning and references:
- The DLV is located with reference to the Seat Index Point (SIP) (ISO 5353) and aligned to a locating axis (LA).
- Rules for seat fore–aft adjustment: standard assumes 150 mm adjustment; if none, specific rear-boundary dimension is reduced (210 mm → 135 mm) or adjusted proportionally.
- Permitted rotation during testing:
- For ROPS/TOPS lateral or longitudinal loading the upper portion of the DLV may rotate up to 15°; the portion below the SIP remains fixed.
- If machine components interfere, rotation is limited to the interference angle.
- Scope notes:
- Machine controls normally positioned inside the DLV are not considered violations.
- Normative references include ISO 3411, ISO 5353, and ISO 6165.
Applications and users
- Used by:
- Test laboratories performing ROPS, TOPS and FOPS laboratory evaluations.
- OEMs and designers of earth-moving machinery for protective-structure verification.
- Certification bodies and compliance engineers assessing conformity with the Machinery Directive (2006/42/EC).
- Safety engineers, regulatory authorities and research organizations focusing on operator protection.
- Practical uses:
- Standardizing operator-geometry simulation during structural impact/deflection tests.
- Ensuring repeatable, traceable lab testing and facilitating certification and product development.
Related standards
- ISO 3411 - Operator physical dimensions and minimum operator space envelope
- ISO 5353 - Seat index point (SIP)
- ISO 6165 - Basic types and definitions for earth‑moving machinery
- EU Machinery Directive 2006/42/EC (essential requirements 3.4.3 / 3.4.4)
