Overview
ISO 22915-11:2011 - Industrial trucks - Verification of stability - Part 11: Industrial variable-reach trucks - specifies test methods to verify the static and dynamic stability of industrial variable-reach trucks (telescopic or articulating booms). The standard applies to counterbalanced variable-reach trucks used on firm, level surfaces and covers trucks equipped with fork arms or load‑handling attachments. It explicitly excludes trucks designed for freight container handling and rough‑terrain variable‑reach trucks (covered by ISO 22915‑14).
Keywords: ISO 22915-11, industrial trucks, variable-reach trucks, stability verification, tilt-table tests, load-handling attachments
Key Topics
- Scope and definitions
- Defines “variable‑reach truck” and “industrial variable‑reach truck” (non‑rough terrain, limited slewing ≤5°).
- References related terminology standards (ISO 5053).
- Verification tests
- Establishes five stability verification tests (Tests 1–5) that cover longitudinal and lateral stability, travel and stacking/retrieving modes, and worst‑case lift/reach combinations.
- Specifies positioning of truck on a tilt table (load/drive axle and steer axle orientation, turning positions, and special placements for articulating chassis or axle locking).
- Test conditions and loads
- Test loads are applied in the least stable lift/reach configurations; Test 5 requires checks at maximum and minimum boom extension and maximum boom angle.
- Lift height for travel simulations: 300 mm above the tilt table for trucks ≤10 t rated capacity; 500 mm for >10 t.
- Devices and configurations
- Procedures require tests both with and without stabilizers, axle‑locking or lateral frame‑levelling devices where fitted.
- Acceptance and marking
- Results determine operating capacities. The capacity under the tested operating condition (with stabilizers/axle locking engaged and disengaged) must be marked on an information plate visible to the operator, per ISO 3691‑2.
- Tilt‑table criteria
- Tilt angles and pass/fail criteria are defined in the standard (including formulas depending on rated capacity and maximum travel speed, e.g., expressions of the form (15 + 1.4v)% are used).
Applications
- Manufacturers of variable‑reach trucks use ISO 22915‑11 to prove stability during design validation and type testing.
- Test laboratories perform tilt‑table and load tests to certify truck safety and compliance.
- Fleet managers, safety engineers and compliance officers reference the standard to assess safe operating limits, marking requirements and recommended procedures for trucks fitted with stabilizers or axle‑locking systems.
- Useful in procurement specifications when requiring certified stability testing for industrial telescopic handlers and reach trucks.
Related Standards
- ISO 22915‑1 - Industrial trucks - Verification of stability - Part 1: General
- ISO 3691‑2 - Industrial trucks - Safety requirements and verification - Part 2: Self‑propelled variable‑reach trucks
- ISO 5053 - Powered industrial trucks - Terminology
- ISO 22915‑14 - Rough‑terrain variable‑reach trucks (for off‑road machines)
For detailed test parameters, tilt‑table placements, and numeric acceptance values refer directly to ISO 22915‑11:2011 and the referenced parts.