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Maintenance and repair
Bosch Rexroth AB
, RE 15300-WA, Version 06.2021
General
The intention is to verify the condition of the oil during operation. The motor
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.
The sample should be taken by using a mini-mess hose connected to a mini-mess
coupling.
Always clean the connections carefully before you connect the mini-mess hose to the
coupling.
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.
Check and be aware of the pressure you may have on the connection before you
connect.
How to do 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 don’t let any contamination be
in touch with the cap, bottle or the mini-mess hose when the sample is taken.
To get a reliable result the system must run without moving any valves and the mini-
mess hose should not touch the bottle.
Only ¾ of the bottle shall be filled because the laboratory has to shake the sample to
get a mixed fluid when they analyse it. Minimum 200 ml are needed for a good analysis.
When the bottle is filled close the cap as soon as possible to prevent contamination
from the air that might enter the bottle and give you a wrong result.
Inline measure
The sample shall be taken at the mini-mess coupling on the charge pressure side
of the motor in of the main loop system. Clean the coupling and the hose carefully.
Connect the hoses according to the particle counters manual.
To get a true value the contamination readings have to be stable about 10 min
before you stop to measure.