Hydraulic Oil Cleanliness (ISO 4406) Tracker
Log particle count ≥4 µm per mL readings, see the wear trend and get a projected date when the 2500 k/mL limit will be reached.
Readings stay in your browser (localStorage) — nothing is uploaded.
Straight-line (least-squares) extrapolation of your logged readings to the 2500 k/mL alarm threshold (warning at 1300 k/mL). A low R² means the trend is noisy — log more readings before trusting the projection.
Field notes from maintenance practice
Log the raw ≥4 µm count rather than the ISO code so small changes stay visible (codes move in factor-of-two steps). One habit predicts most hydraulic failures: sample after the filter at steady temperature from the same port every time. A count that doubles while the filter ΔP also rises means ingress (breather, rod seals); doubling with clean filters means internal wear — pump or cylinder. The default action limit of 2500 k/mL comes from ISO 4406 code targets: servo systems typically need ≤ 16/14/11 and general industrial hydraulics ≤ 19/17/14 — 2,500 k/mL ≥4 µm corresponds to a code-21 system in trouble (set your component maker's target); adjust it if your OEM or procedure specifies otherwise.
Linear extrapolation is honest only when the R² is decent (≥ 0.7) and degradation is steady. Contamination begets contamination: particles erode valve lands and pump plates, generating more particles — so an upward-bending count means active wear is underway somewhere, not just dirt ingress. If the last reading jumps far off the line, re-measure before believing it — measurement technique drifts too.
Sources & references
- ISO 4406 — method for coding the level of contamination by solid particles
- Component manufacturer cleanliness charts (Bosch Rexroth, Parker, Eaton)
Trend screening only — confirm with a proper inspection before running equipment to a projected limit.
Hydraulic Oil Cleanliness (ISO 4406) Tracker for maintenance and reliability teams: Log particle count ≥4 µm per mL readings, see the wear trend and get a projected date when the 2500 k/mL limit will be reached. Free, private (everything runs in your browser) and ready for daily plant use.
About Hydraulic Oil Cleanliness (ISO 4406) Tracker
This tracker is a remaining-useful-life (RUL) estimator for particle count ≥4 µm per mL. Log a dated reading whenever you measure; the tool fits a least-squares straight line through your history and projects when it will cross the 2500 k/mL action limit (warning at 1300 k/mL) — turning scattered measurements into a forecast date you can plan parts and downtime around.
How to use Hydraulic Oil Cleanliness (ISO 4406) Tracker
- 1Enter each dated measurement as you take it — readings persist in your browser between visits.
- 2Adjust the alarm (and warning) threshold to your OEM or procedure limit if it differs from the default.
- 3Read the fitted trend, R², days-to-alarm and the projected date — then plan parts and downtime around that date.
Why use Hydraulic Oil Cleanliness (ISO 4406) Tracker?
- ✓Log particle count ≥4 µm per mL readings, see the wear trend and get a projected date when the 2500 k/mL limit will be reached — computed instantly with the standard formula
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser — readings and asset data never leave your device
- ✓Niche-specific defaults and thresholds for particle count ≥4 µm per mL, traceable to the cited standards
Frequently asked questions
What limit should trigger action for particle count ≥4 µm per mL?+
The widely used limit is 2500 k/mL (ISO 4406 code targets: servo systems typically need ≤ 16/14/11 and general industrial hydraulics ≤ 19/17/14 — 2,500 k/mL ≥4 µm corresponds to a code-21 system in trouble (set your component maker's target)). Set a warning at 1300 k/mL so parts and labour are ready before the alarm. Your OEM manual or internal procedure overrides the generic figure.
Which ISO 4406 cleanliness code should my system actually target?+
Match the most sensitive component: servo valves want 16/14/11, proportional valves 17/15/12, piston pumps 18/16/13, gear pumps tolerate 19/17/14. One code coarser than target roughly halves component life by Noria/component-maker wear curves. Find the tightest requirement in your circuit, set that as the target, and put the alarm here at about double its ≥4 µm count.
How many readings before the projection is trustworthy?+
At least 4–6 spread over a meaningful fraction of the asset's life, with a fit R² of about 0.7 or better. Two points always make a perfect line — that is curve fitting, not condition monitoring. Keep measurement conditions (load, temperature, location) consistent.
Is straight-line extrapolation valid for wear?+
It is the standard first approximation for steady-state degradation, and it is deliberately conservative to act on. Many failure modes accelerate near the end (bathtub curve), so treat the projected date as the latest acceptable intervention date, not a promise.
Where is my logged data stored?+
Entirely in your browser's localStorage on this device — nothing is uploaded to any server. Export or note critical values elsewhere if you need a permanent maintenance record shared across a team.
Embed Hydraulic Oil Cleanliness (ISO 4406) Tracker on your website
Want Hydraulic Oil Cleanliness (ISO 4406) Trackeron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/hydraulic-particle-count-tracker" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Hydraulic Oil Cleanliness (ISO 4406) Tracker — ToolJolt" loading="lazy"></iframe>Related Industrial tools
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