Overview
ISO 10533:1993 specifies the performance requirements and test method for mechanical lift‑arm support devices used on loaders, backhoe loaders and skid‑steer loaders where the lift arm must be held elevated for maintenance, servicing or other non‑operational purposes. The standard also covers installation, installation instructions, storage and colour requirements for these support devices.
Key definitions in the standard include lift‑arm, mechanical lift‑arm support device(s) (links, bars or structures including attachment points), and working circuit pressure (nominal pressure applied to the specific circuit by the pump(s)).
Key Topics
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Performance requirement: The support device shall be designed to withstand the static load imposed by the lowering force of the working circuit pressure plus 1.5 times the mass of the empty attachments, arms and linkage. If the device is loaded by lifting action it shall also withstand the lifting force.
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Test method: A physical test is required for each design to verify clause 4. The support device must withstand the test without permanent structural deformation or failure.
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Installation:
- The device shall be installed within the machine structure so that neither movement of the machine nor upward/downward movement of the lift‑arm linkage will dislodge or disengage the support device.
- An elevated lift‑arm position that provides good access for maintenance is recommended.
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Installation instructions: Instructions are to be provided by a permanent means adjacent to the point of use and should state that maintenance/servicing operations be made with an empty bucket or empty attachment.
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Storage: The support device and its required parts shall be stored permanently on the machine in a secure manner.
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Colour requirements: The support device, excluding attaching parts, shall be red on all machines except where the machine colour is red - in that case the support device shall be yellow.
Applications
ISO 10533:1993 is directly applicable to manufacturers, designers, service departments and safety personnel responsible for:
- Loaders, backhoe loaders and skid‑steer loaders equipped with lift arms
- Specifying, testing and validating lift‑arm support devices for maintenance safety
- Defining installation, storage and marking practices to reduce maintenance risk
Practical benefits include consistent test criteria for structural integrity, clear installation and storage practices that reduce the risk of support device disengagement, and standardised colour coding to improve visibility during servicing.
Related Standards
The standard references other ISO documents for definitions and measurement methods. Relevant related standards cited in ISO 10533:1993 include:
- ISO 6016:1982 - Methods of measuring the masses of whole machines, their equipment and components.
- ISO 6746‑1:1987 - Earth‑moving machinery - Definitions of dimensions and symbols - Part 1: Base machine.
- ISO 6746‑2:1987 - Earth‑moving machinery - Definitions of dimensions and symbols - Part 2: Equipment.
These referenced standards are recommended for determining forces and masses used when applying the performance and test requirements of ISO 10533:1993.
Keywords: ISO 10533, lift‑arm support devices, earth‑moving machinery, loaders, backhoe loaders, skid‑steer loaders, performance requirements, test method, installation, storage, colour.