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2.3.1 Recommended Limits for ISO 4406 Particle Count
The specification for a 100 ml oil sample is ISO 4406 --/20/17 maximum in the system
oil downstream of the filter, which means:
D It is not necessary to count particles of size equal to or more than 4 m
D A maximum of 1 000 000 particles of size equal to or less than 6 m
D A maximum of 130 000 particles of size equal to or more than 14 m.
This is the same as the specification before for a maximum of NAS Class 8 particle
count.
ISO 4406 is only for particles up to 21 m. For particles larger than 21 m, the SAE
particle count must be obeyed.
2.3.2 Servo Oil − Particle Counts
If the particle count is more than the limit given, do a check of the coarse and fine
filters. This will make sure that all filter elements, gaskets and seals are not damaged.
If a high particle count continues and the filters are serviceable, it is possible that an
area of wear in the engine causes an unsatisfactory number of particles. Too many
particles can also go into the system oil if the piston rod gland boxes do not correctly
seal and used cylinder lubricating oil mixes with the system oil.
The purifier removes particles, and you must make sure that the purifier is operated at
the correct temperature. Refer to the manufacturers recommendations and make sure
that the flow rate is adjusted to get the best operation.
2016−11
Lubricating Oils
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