RE 15300-WA, Version 06.2021,
Bosch Rexroth AB
Maintenance and repair 61/72
It is important that the inspection of the magnet will be done on a regular basis
so changes in the amount of metal particles can be correctly detected. The valve
insert is self-sealing and the magnet can be removed for inspections.
When running in a new motor, the metal content are higher than normal, and the
magnet will therefore contain more metal particles than normal. This may also be
the situation when inspecting the magnet the first time after work has been done
in the system.
At normal conditions the magnetic plug may contain a minor amount of small visible
particles.
Inspection routine
•
First inspection after installation, or if work has been done in the system, shall
be done after 12 hours and then according to
. At this point, the metal
content are higher than normal and metal particles on the magnet can be left
without notice. Clean and re-install the magnet.
•
Recommended inspection intervals are two weeks, see
•
The magnet shall be cleaned (wiped of) before re-installation.
•
If more or larger visible particles are found on the magnet than normal, reduce
the checking interval to every second day to determine
the trend of the particle
level.
Please contact your Bosch Rexroth representative for further actions.
10.2.2 Oil inspection
Purpose to take oil sample
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, overhauls, maintenance or repairs, thus saving money on equipment
repairs and downtime.
The most used method is to take samples in a clean sample bottle and send it to a
fluid laboratory for an analysis and from the laboratory you get a report, which follow
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.