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Maintenance and repair
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oil analysis
The purpose to take an oil sample is to check the condition of the oil.
With scheduled oil analysis, wear products can be identified and corrective action
can be taken before failure occurs. Oil analysis can indicate when an oil change is
required, point out shortcomings in maintenance and keep repair cost to a minimum.
Using oil analysis can create a "window of opportunity", allowing the user to
schedule, overhaul, maintenance or repairs, thus saving money on equipment repairs
and downtime.
A common method is to take samples in a special bottle and send to a fluid
laboratory for a analysis to get a report, following a specific international standard.
The analysis should cover viscosity, oxidation, water content, particle counting
possibly including element analysis of particles.
Another method is to install an inline particle counter direct in your hydraulic
system which give you the contamination level according to international standards.
The disadvantage with this method is that you only get the contamination level in
the oil. If inline measurement has to be done, please contact your Bosch Rexroth
representative for advice.
General
The intention is to verify the condition of the oil during operation. The motors should
be running at normal operation while the sample is taken.
The cleanliness is extremely important during sampling.
Always use bottles adapted to oil samples, they can be ordered from any fluid
analysis laboratory.
Never try to clean your own bottle if you want a true value of the result.
Use a measuring coupling (can be of minimess type) to achieve the oil for the
sample. When the sample is taken use a dedicated hose with correct suitable
coupling that fits the measuring coupling.
Always clean the connections carefully before you connect the mini-mess hose to the
coupling.
Check and be aware of the pressure you may have on the connection before you
connect.
Be careful when connecting the mini-mess hose because the oil beam can be
dangerous and should never point against any person or other sensible object.
Bottle samples
The sample shall be taken at the mini-mess coupling on the low pressure side of the
motor in the main loop. Never take the sample out of the tank using the ball valves.
Clean the coupling and the hose carefully.
Connect the mini-mess hose to the coupling but be careful and be aware of the
direction of the oil beam.
Let minimum 2 litres (0,53 gallon US) of oil flush into a bucket before you fill the
bottle.
Remove the cap of the bottle as late as possible and avoid any contamination to be
in touch with the cap, bottle or mini-mess hose when the sample is taken.
Hägglunds DOb, RE 15327-WA/05.2017, Installation and maintenance manual, Bosch Rexroth AB
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