Commissioning 49/68
RE 92004-01-B/05.2017, A4VG Series 40,
Bosch Rexroth AG
8.2 Running-in phase
NOTICE
Property damage by insufficient viscosity!
An increased hydraulic fluid temperature may reduce the viscosity values by too
much and damage the product!
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Monitor the operating temperature during the running-in phase, e.g. by
measuring the leakage temperature.
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Reduce the loading (pressure, rotational speed) of the axial piston unit if
impermissible operating temperatures and/or viscosities occur.
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Operating temperatures that are too high indicate faults that have to be
analyzed and eliminated.
The bearings and sliding surfaces are subject to a running-in phase. The increased
friction at the start of the running-in phase results in increased heat development
which decreases with increasing operating hours. The volumetric and mechanical-
hydraulic efficiency increases as well until the conclusion of the running-in phase
of approx. 10 operating hours.
To ensure that contamination in the hydraulic system does not damage the axial
piston unit, Bosch Rexroth recommends the following procedure after the running-in
phase:
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After the running-in phase, have a hydraulic fluid sample analyzed for the required
cleanliness level.
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Change the hydraulic fluid if the required cleanliness level is not reached. If a
laboratory test is not carried out after the running-in phase, it is recommended
to change the hydraulic fluid.
8.3 Recommissioning after a standstill
Depending on the installation conditions and ambient conditions, changes may occur
in the hydraulic system which make recommissioning necessary.
Among others, the following criteria may make recommissioning necessary:
• Air and/or water in the hydraulic system
• Old hydraulic fluid
• Other contamination
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For recommissioning, proceed as described in chapter 8.1 “Initial commissioning”
on page 46.