Overview
ISO/TR 10949:2002 - "Hydraulic fluid power - Component cleanliness" - is an informative Technical Report that provides guidelines for achieving, evaluating and controlling the cleanliness of hydraulic fluid power components from manufacture through installation. It addresses contamination control across production, packaging, storage, transport, receiving and final installation. As a Technical Report, ISO/TR 10949:2002 is intended to guide best practices rather than impose mandatory requirements.
Key topics and requirements
The report covers practical, process-focused guidance rather than prescriptive limits. Main technical topics include:
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Roles & responsibilities
- Manufacturer: ensure parts meet cleanliness requirements at release, clean parts before assembly, flush and test using clean fluids, prepare components for packaging.
- Supplier: agree responsibilities with purchaser for packaging, storage and transport cleanliness.
- Purchaser: control cleanliness after receipt through unpacking, storage and installation.
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Cleaning methods
- Shot blasting for removing casting sand and scale.
- Ultrasonic cleaning with filtered baths and correct temperature.
- Chemical cleaning (aqueous, semi‑aqueous, solvent) with health/safety and environmental considerations.
- Flushing: circulate a liquid of known cleanliness through components under defined flow/temperature conditions; use compatible fluids and ensure removal afterwards if incompatible.
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Assembly and protection
- Assemble immediately after cleaning in controlled environments; avoid contaminant-generating operations nearby.
- Protect cleaned components using plugs, caps, sealed packaging, corrosion inhibitors or filling with clean hydraulic fluid (table of recommended methods provided).
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Testing and evaluation
- Test rigs must have filtration equal to or better than the component cleanliness requirement; in-line filters recommended where testing generates contaminants.
- Cleanliness evaluation and inspection documentation should follow ISO 18413 principles and contamination coding (see related standards).
Applications
ISO/TR 10949:2002 is practical for organizations aiming to reduce contamination-related failures in hydraulic systems. Typical applications include:
- Manufacturing quality control for hydraulic valves, pumps, actuators, hoses and fittings
- Designing cleaning, flushing and assembly procedures on production lines
- Specifying packaging and transport methods to maintain component cleanliness
- Setting acceptance criteria and inspection documents for purchased components
- Improving reliability and lifespan of hydraulic fluid power systems by minimizing particulate contamination
Who should use it
- Hydraulic component manufacturers and assemblers
- Suppliers and distributors of hydraulic parts
- System integrators, maintenance and reliability engineers
- Quality, contamination control and test-rig engineers
- Purchasing specialists specifying cleanliness requirements
Related standards
- ISO 4406 - Method for coding contamination by solid particles (fluid cleanliness codes)
- ISO 5598 - Fluid power systems and components - Vocabulary
- ISO 18413 - Cleanliness inspection documentation and contaminant analysis principles
Keywords: ISO/TR 10949:2002, hydraulic fluid power, component cleanliness, contamination control, cleaning methods, flushing, packaging, storage, hydraulic component testing.
