Overview
ISO 6489-5:2019 defines the specifications for non-swivel clevis couplings used in the mechanical connection between towed and towing agricultural vehicles. This standard, published by ISO, establishes the requirements for safe and reliable attachment of agricultural trailers and implements-equipped with ISO 5692-3 swivel hitch rings-to the rear of self-propelled agricultural vehicles such as tractors.
Non-swivel clevis couplings are critical for ensuring the secure, efficient transfer of loads and forces during agricultural operations. Adhering to ISO 6489-5:2019 supports equipment interoperability and enhances safety and performance in the agri-machinery sector.
Key Topics
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Definitions and Terminology
The standard provides clear descriptions of non-swivel clevis couplings, D values (horizontal force component), and vertical load requirements for coupling points.
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Constructional and Design Requirements
- Couplings must be manufactured to precise dimensions and tolerances, ensuring fit and durability.
- The clevis design must allow specific movement ranges for the hitch ring:
- ±60° horizontal (yaw)
- ±20° vertical (pitch)
- ±20° longitudinal axis (roll)
- Inclusion of a safety device to prevent unintentional uncoupling, tested at 0.25D static load.
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Calculation of D Value
The representative force (D value) is determined by the total allowable mass of both towing and towed vehicles, essential for selecting or designing appropriate couplings.
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Installation and Positioning
The standard specifies the location requirements of the non-swivel clevis coupling relative to the tractor’s power take-off (PTO) shaft, to maintain clearance and ensure proper attachment.
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Compatibility and Marking
- Defines which coupling shapes correspond with specific hitch ring shapes (e.g., w, x, y, z).
- Requires clear, permanent markings for identification and traceability.
Applications
ISO 6489-5:2019 is essential for:
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Manufacturers of Agricultural Machinery:
Ensures couplings produced are compatible with international equipment and meet safety and durability standards.
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Farm Equipment Operators and Maintenance Teams:
Provides assurance that couplings and attachments meet standardized requirements, enhancing operational integrity and reducing risk of detachment.
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Design and Engineering Departments:
Facilitates proper selection of coupling types during the design and retrofitting of agricultural vehicles, promoting equipment interoperability and compliance.
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Regulatory Compliance:
Adhering to ISO 6489-5:2019 assists in meeting legal and safety requirements in various markets for agricultural machinery.
Related Standards
For comprehensive compliance, ISO 6489-5:2019 should be used alongside the following relevant standards:
- ISO 5692-3: Specifications for swivel hitch rings used in conjunction with clevis couplings.
- ISO 500-1: General specifications and safety requirements for rear-mounted PTO shafts.
- ISO 6489-1: Dimensions of hitch-hooks for mechanical connections.
- ISO 6489-2: Specifications for clevis coupling 40.
- ISO 2768-1 and ISO 286-1: General tolerances for dimensions and fits.
- ISO 24347: Dimensions for ball-type coupling devices.
Using ISO 6489-5:2019 alongside related agricultural vehicle connection standards fosters safer, more reliable, and globally compatible equipment solutions.
Keywords: ISO 6489-5:2019, agricultural vehicles, non-swivel clevis couplings, mechanical connections, tractor attachments, implement hitching standards, agricultural trailer connections, international standards, agricultural machinery safety, coupling design requirements.